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C语言的学习要从基础,100个经典的算法 (转载)

2012-07-27 15:46 453 查看
C语言的学习要从基础开始,这里是100个经典的算法-1C语言的学习要从基础开始,这里是100个经典的算法

题目:古典问题:有一对兔子,从出生后第3个月起每个月都生一对兔子,小兔

子长到第三个月后每个月又生一对兔子,假如兔子都不死,问每个月的兔子总数

为多少?

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程序分析:兔子的规律为数列1,1,2,3,5,8,13,21....

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程序源代码:
main()
{
long f1,f2;
int i;
f1=f2=1;
for(i=1;i<=20;i++)
 { printf("%12ld %12ld",f1,f2);
   if(i%2==0) printf("/n");/*控制输出,每行四个*/
   f1=f1+f2;/*前两个月加起来赋值给第三个月*/
   f2=f1+f2;/*前两个月加起来赋值给第三个月*/
 }
}

上题还可用一维数组处理,you try!

题目:判断101-200之间有多少个素数,并输出所有素数。

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程序分析:判断素数的方法:用一个数分别去除2到sqrt(这个数),如果能被整

除,则表明此数不是素数,反之是素数。

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程序源代码:
#include "math.h"
main()
{
 int m,i,k,h=0,leap=1;
 printf("/n");
 for(m=101;m<=200;m++)
  { k=sqrt(m+1);
   for(i=2;i<=k;i++)
     if(m%i==0)
      {leap=0;break;}
   if(leap) {printf("%-4d",m);h++;
        if(h%10==0)
        printf("/n");
        }
   leap=1;
  }
 printf("/nThe total is %d",h);
}

题目:打印出所有的“水仙花数”,所谓“水仙花数”是指一个三位数,其各位

数字立方和等于该数本身。例如:153是一个“水仙花数”,因为153=1的三次方

+5的三次方+3的三次方。

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程序分析:利用for循环控制100-999个数,每个数分解出个位,十位,百位。

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程序源代码:
main()
{
int i,j,k,n;
printf("'water flower'number is:");
 for(n=100;n<1000;n++)
 {
  i=n/100;/*分解出百位*/
  j=n/10%10;/*分解出十位*/
  k=n%10;/*分解出个位*/
  if(i*100+j*10+k==i*i*i+j*j*j+k*k*k)
   {
   printf("%-5d",n);
   }
 }
printf("/n");
}

题目:将一个正整数分解质因数。例如:输入90,打印出90=2*3*3*5。

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程序分析:对n进行分解质因数,应先找到一个最小的质数k,然后按下述步骤完

成:
(1)如果这个质数恰等于n,则说明分解质因数的过程已经结束,打印出即可。
(2)如果n<>k,但n能被k整除,则应打印出k的值,并用n除以k的商,作为新的正

整数你n,重复执行第一步。
(3)如果n不能被k整除,则用k+1作为k的值,重复执行第一步。

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程序源代码:
/* zheng int is divided yinshu*/
main()
{
int n,i;
printf("/nplease input a number:/n");
scanf("%d",&n);
printf("%d=",n);
for(i=2;i<=n;i++)
 {
  while(n!=i)
  {
   if(n%i==0)
   { printf("%d*",i);
    n=n/i;
   }
   else
    break;
  }
}
printf("%d",n);
}

题目:利用条件运算符的嵌套来完成此题:学习成绩>=90分的同学用A表示,60

-89分之间的用B表示,60分以下的用C表示。

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程序分析:(a>b)?a:b这是条件运算符的基本例子。

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程序源代码:
main()
{
 int score;
 char grade;
 printf("please input a score/n");
 scanf("%d",&score);
 grade=score>=90?'A'score>=60?'B':'C');
 printf("%d belongs to %c",score,grade);
}

题目:输入两个正整数m和n,求其最大公约数和最小公倍数。

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程序分析:利用辗除法。

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程序源代码:
main()
{
 int a,b,num1,num2,temp;
 printf("please input two numbers:/n");
 scanf("%d,%d",&num1,&num2);
 if(num1  { temp=num1;
  num1=num2; 
  num2=temp;
 }
a=num1;b=num2;
while(b!=0)/*利用辗除法,直到b为0为止*/
 {
  temp=a%b;
  a=b;
  b=temp;
 }
printf("gongyueshu:%d/n",a);
printf("gongbeishu:%d/n",num1*num2/a);
}

题目:输入一行字符,分别统计出其中英文字母、空格、数字和其它字符的个数



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程序分析:利用while语句,条件为输入的字符不为'/n'.

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程序源代码:
#include "stdio.h"
main()
{char c;
 int letters=0,space=0,digit=0,others=0;
 printf("please input some characters/n");
 while((c=getchar())!='/n')
 {
 if(c>='a'&&c<='z'||c>='A'&&c<='Z')
  letters++;
 else if(c==' ')
  space++;
   else if(c>='0'&&c<='9')
       digit++;
     else
       others++;
}
printf("all in all:char=%d space=%d digit=%d ōthers=%

d/n",letters,space,digit,others);
}

题目:求s=a+aa+aaa+aaaa+aa...a的值,其中a是一个数字。例如

2+22+222+2222+22222(此时共有5个数相加),几个数相加有键盘控制。

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程序分析:关键是计算出每一项的值。

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程序源代码:
main()
{
 int a,n,count=1;
 long int sn=0,tn=0;
 printf("please input a and n/n");
 scanf("%d,%d",&a,&n);
 printf("a=%d,n=%d/n",a,n);
 while(count<=n)
 {
  tn=tn+a;
  sn=sn+tn;
  a=a*10;
  ++count;
 }
printf("a+aa+...=%ld/n",sn);
}

题目:一个数如果恰好等于它的因子之和,这个数就称为“完数”。例如6=1+2

+3.编程找出1000以内的所有完数。

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程序源代码:
main()
{
static int k[10];
int i,j,n,s;
for(j=2;j<1000;j++)
 {
 n=-1;
 s=j;
  for(i=1;i   {
   if((j%i)==0)
   { n++;
    s=s-i;
    k
=i;
   }
  }
 if(s==0)
 {
 printf("%d is a wanshu",j);
 for(i=0;i  printf("%d,",k);
 printf("%d/n",k
);
 }
}
}

题目:一球从100米高度自由落下,每次落地后反跳回原高度的一半;再落下,

求它在第10次落地时,共经过多少米?第10次反弹多高?

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程序源代码:
main()
{
float sn=100.0,hn=sn/2;
int n;
for(n=2;n<=10;n++)
 {
  sn=sn+2*hn;/*第n次落地时共经过的米数*/
  hn=hn/2; /*第n次反跳高度*/
 }
printf("the total of road is %f/n",sn);
printf("the tenth is %f meter/n",hn);
}

题目:一只猴子摘了N个桃子第一天吃了一半又多吃了一个,第二天又吃了余下的

一半又多吃了一个,到第十天的时候发现还有一个.

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程序源代码:
/* 猴子吃桃问题 */
main()
{
int i,s,n=1;
for(i=1;i<10;i++)
{
s=(n+1)*2
n=s;
}
printf("第一天共摘了%d个桃/n",s);
}

迭代法求方程根

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/* 迭代法求一个数的平方根 */
#define Epsilon 1.0E-6 /*控制解的精度*/
#include<math.h>
main()
{
float a,x0,x1;
printf("请输入要求的数:");
scanf("%f",&a);
x0=a/2;
x1=(x0+a/x0)/2;
while(fabs(x1-x0)>=Epsilon)
  {
  x0=x1;
  x1=(x0+a/x0)/2;
  }
printf("%f的平方根:%f.5/n",x1);
}

/* 上题的另一种算法 */
#define Epsilon 1.0E-6 /*控制解的精度*/
#include <stdio.h>
#include <math.h>
main()
{
float num,pre,this;
do
  {
  scanf("%f",&num);/*输入要求平方根的数*/
  }while(num<0);
if (num==0)
  printf("the root is 0");
else
  {
   this=1;
   do
   {
    pre=this;
    this=(pre+num/pre)/2;
    }while(fabs(pre-this)>Epsilon);/*用解的精度,控制循环次数*/

   }
printf("the root is %f",this);
}

用牛顿迭代法 求方程 2*x*x*x-4*x*x+3*x-6 的根
/* 牛顿迭代法 */
#define Epsilon 1.0E-6 /*控制解的精度*/
#include<math.h>
main()
{
   float x1,x0=1.5;
   x1=x0-(2*x0*x0*x0-4*x0*x0+3*x0-6)/(6*x0*x0-8*x0+3);
   while(fabs(x1-x0>=Epsilon)
   {  
      x0=x1;
      x1=x0-(2*x0*x0*x0-4*x0*x0+3*x0-6)/(6*x0*x0-8*x0+3);
   }
   printf("方程的根为%f/n",x1);
}

用二分法求上题
/* 二分法 */
#define Epsilon 1.0E-5 /*控制解的精度*/
#include<math.h>

main()
{
   folat x1,x2,x0,f1,f2,f0;
   x0=(x1+x2)/2;
   f0=2*x0*x0*x0-4*x0*x0+3*x0-6;   /* 求中点的函数值 */
   while(fabs(f0)>=Epsilon)
   {
     if(f0*f1<0)
     { x2=x0;
f2=2*x2*x2*x2-4*x2*x2+3*x2-6;
     }
     if(f0*f2<0)
     { x1=x0;
f1=2*x1*x1*x1-4*x1*x1+3*x1-6;
     }
     x0=(x1+x2)/2;
     f0=2*x0*x0*x0-4*x0*x0+3*x0-6;
   }
   printf("用二分法求得方程的根:%f/n",x0);
}

题目:打印出如下图案(菱形)

*
***
******
********
******
***
*

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程序分析:先把图形分成两部分来看待,前四行一个规律,后三行一个规律,利

用双重for循环,第一层控制行,第二层控制列。

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程序源代码:
main()
{
int i,j,k;
for(i=0;i<=3;i++)
 {
 for(j=0;j<=2-i;j++)
  printf(" ");
 for(k=0;k<=2*i;k++)
  printf("*");
 printf("/n");
 }
for(i=0;i<=2;i++)
 {
 for(j=0;j<=i;j++)
  printf(" ");
 for(k=0;k<=4-2*i;k++)
  printf("*");
 printf("/n");
 }
}

题目:一个5位数,判断它是不是回文数。即12321是回文数,个位与万位相同,

十位与千位相同。

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程序分析:同29例

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程序源代码:
main( )
{
long ge,shi,qian,wan,x;
scanf("%ld",&x);
wan=x/10000;
qian=x%10000/1000;
shi=x%100/10;
ge=x%10;
if (ge==wan&&shi==qian)/*个位等于万位并且十位等于千位*/
 printf("this number is a huiwen/n");
else
 printf("this number is not a huiwen/n");
}

题目:请输入星期几的第一个字母来判断一下是星期几,如果第一个字母一样,

则继续判断第二个字母。

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程序分析:用情况语句比较好,如果第一个字母一样,则判断用情况语句或if语

句判断第二个字母。

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程序源代码:
#include <stdio.h>
void main()
{
char letter;
printf("please input the first letter of someday/n");
while ((letter=getch())!='Y') /*当所按字母为Y时才结束*/
{ switch (letter)
{case 'S':printf("please input second letter/n");
     if((letter=getch())=='a')
      printf("saturday/n");
     else if ((letter=getch())=='u')
         printf("sunday/n");
       else printf("data error/n");
     break;
case 'F':printf("friday/n");break;
case 'M':printf("monday/n");break;
case 'T':printf("please input second letter/n");
     if((letter=getch())=='u')
      printf("tuesday/n");
     else if ((letter=getch())=='h')
         printf("thursday/n");
       else printf("data error/n");
     break;
case 'W':printf("wednesday/n");break;
default: printf("data error/n");
  }
 }
}

题目:Press any key to change color, do you want to try it. Please

hurry up!

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程序源代码:
#include <conio.h>
void main(void)
{
int color;
for (color = 0; color < 8; color++)
 {
 textbackground(color); /*设置文本的背景颜色*/
 cprintf("This is color %d/r/n", color);
 cprintf("ress any key to continue/r/n");
 getch(); /*输入字符看不见*/
 }
}

题目:学习gotoxy()与clrscr()函数

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程序源代码:
#include <conio.h>
void main(void)
{
clrscr(); /*清屏函数*/
textbackground(2);
gotoxy(1, 5); /*定位函数*/
cprintf("Output at row 5 column 1/n");
textbackground(3);
gotoxy(20, 10);
cprintf("Output at row 10 column 20/n");
}

题目:练习函数调用

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程序源代码:
#include <stdio.h>
void hello_world(void)
{
printf("Hello, world!/n");
}
void three_hellos(void)
{
int counter;
for (counter = 1; counter <= 3; counter++)
hello_world();/*调用此函数*/
}
void main(void)
{
three_hellos();/*调用此函数*/
}

题目:文本颜色设置

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程序源代码:
#include <conio.h>
void main(void)
{
int color;
for (color = 1; color < 16; color++)
 {
 textcolor(color);/*设置文本颜色*/
 cprintf("This is color %d/r/n", color);
 }
textcolor(128 + 15);
cprintf("This is blinking/r/n");
}

题目:求100之内的素数

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程序源代码:
#include <stdio.h>
#include "math.h"
#define N 101
main()
{
int i,j,line,a
;
for(i=2;i<N;i++) a=i;
for(i=2;i<sqrt(N);i++)
 for(j=i+1;j<N;j++)
 {
  if(a!=0&&a[j]!=0)
  if(a[j]%a==0)
  a[j]=0;}
printf("/n");
for(i=2,line=0;i<N;i++)
{
 if(a!=0)
 {printf("%5d",a);
 line++;}
 if(line==10)
 {printf("/n");
line=0;}
}
}

题目:对10个数进行排序

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程序分析:可以利用选择法,即从后9个比较过程中,选择一个最小的与第一个

元素交换,下次类推,即用第二个元素与后8个进行比较,并进行交换。    

   
程序源代码:
#define N 10
main()
{int i,j,min,tem,a
;
/*input data*/
printf("please input ten num:/n");
for(i=0;i<N;i++)
{
printf("a[%d]=",i);
scanf("%d",&a);}
printf("/n");
for(i=0;i<N;i++)
printf("%5d",a);
printf("/n");
/*sort ten num*/
for(i=0;i<N-1;i++)
{min=i;
for(j=i+1;j<N;j++)
if(a[min]>a[j]) min=j;
tem=a;
a=a[min];
a[min]=tem;
}
/*output data*/
printf("After sorted /n");
for(i=0;i<N;i++)
printf("%5d",a);
}

题目:求一个3*3矩阵对角线元素之和

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程序分析:利用双重for循环控制输入二维数组,再将a累加后输出。

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程序源代码:
main()
{
float a[3][3],sum=0;
int i,j;
printf("please input rectangle element:/n");
for(i=0;i<3;i++)
 for(j=0;j<3;j++)
 scanf("%f",&a[j]);
for(i=0;i<3;i++)
 sum=sum+a;
printf("duijiaoxian he is %6.2f",sum);
}

题目:有一个已经排好序的数组。现输入一个数,要求按原来的规律将它插入数

组中。

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程序分析:首先判断此数是否大于最后一个数,然后再考虑插入中间的数的情况

,插入后此元素之后的数,依次后移一个位置。

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程序源代码:
main()
{
int a[11]={1,4,6,9,13,16,19,28,40,100};
int temp1,temp2,number,end,i,j;
printf("original array is:/n");
for(i=0;i<10;i++)
 printf("%5d",a);
printf("/n");
printf("insert a new number:");
scanf("%d",&number);
end=a[9];
if(number>end)
 a[10]=number;
else
 {for(i=0;i<10;i++)
  { if(a>number)
   {temp1=a;
    a=number;
   for(j=i+1;j<11;j++)
   {temp2=a[j];
    a[j]=temp1;
    temp1=temp2;
   }
   break;
   }
  }
}
for(i=0;i<11;i++)
 printf("%6d",a);
}

题目:将一个数组逆序输出。

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程序分析:用第一个与最后一个交换。

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程序源代码:
#define N 5
main()
{ int a
={9,6,5,4,1},i,temp;
 printf("/n original array:/n");
 for(i=0;i<N;i++)
 printf("%4d",a);
 for(i=0;i<N/2;i++)
 {temp=a;
  a=a[N-i-1];
  a[N-i-1]=temp;
 }
printf("/n sorted array:/n");
for(i=0;i<N;i++)
 printf("%4d",a);
}

题目:学习static定义静态变量的用法

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程序源代码:
#include "stdio.h"
varfunc()
{
int var=0;
static int static_var=0;
printf("/40:var equal %d /n",var);
printf("/40:static var equal %d /n",static_var);
printf("/n");
var++;
static_var++;
}
void main()
{int i;
 for(i=0;i<3;i++)
  varfunc();
}

题目:学习使用auto定义变量的用法

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程序源代码:
#include "stdio.h"
main()
{int i,num;
num=2;
 for (i=0;i<3;i++)
 { printf("/40: The num equal %d /n",num);
  num++;
  {
  auto int num=1;
  printf("/40: The internal block num equal %d /n",num);
  num++;
  }
 }
}
C语言的学基础,100个经典的算法-2
程序源代码:
#include "stdio.h"
main()
{
int i,num;
num=2;
for(i=0;i<3;i++)
{
printf("/40: The num equal %d /n",num);
num++;
{
static int num=1;
printf("/40:The internal block num equal %d/n",num);
num++;
}
}
}

题目:学习使用external的用法。

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程序源代码:
#include "stdio.h"
int a,b,c;
void add()
{ int a;
a=3;
c=a+b;
}
void main()
{ a=b=4;
add();
printf("The value of c is equal to %d/n",c);
}

题目:学习使用register定义变量的方法。

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程序源代码:
void main()
{
register int i;
int tmp=0;
for(i=1;i<=100;i++)
tmp+=i;
printf("The sum is %d/n",tmp);
}

题目:宏#define命令练习(1)

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程序源代码:
#include "stdio.h"
#define TRUE 1
#define FALSE 0
#define SQ(x) (x)*(x)
void main()
{
int num;
int again=1;
printf("/40: Program will stop if input value less than 50./n");
while(again)
{
printf("/40lease input number==>");
scanf("%d",&num);
printf("/40:The square for this number is %d /n",SQ(num));
if(num>=50)
 again=TRUE;
else
 again=FALSE;
}
}

题目:宏#define命令练习(2)

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程序源代码:
#include "stdio.h"
#define exchange(a,b)
{ / /*宏定义中允许包含两道衣裳命令的情形,此时必须在最右边加上"/"*/
 int t;/
 t=a;/
 a=b;/
 b=t;/
}
void main(void)
{
int x=10;
int y=20;
printf("x=%d; y=%d/n",x,y);
exchange(x,y);
printf("x=%d; y=%d/n",x,y);
}

题目:宏#define命令练习(3)

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程序源代码:
#define LAG >
#define SMA <
#define EQ ==
#include "stdio.h"
void main()
{ int i=10;
int j=20;
if(i LAG j)
printf("/40: %d larger than %d /n",i,j);
else if(i EQ j)
printf("/40: %d equal to %d /n",i,j);
else if(i SMA j)
printf("/40:%d smaller than %d /n",i,j);
else
printf("/40: No such value./n");
}

题目:#if #ifdef和#ifndef的综合应用。

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程序源代码:
#include "stdio.h"
#define MAX
#define MAXIMUM(x,y) (x>y)?x:y
#define MINIMUM(x,y) (x>y)?y:x
void main()
{ int a=10,b=20;
#ifdef MAX
printf("/40: The larger one is %d/n",MAXIMUM(a,b));
#else
printf("/40: The lower one is %d/n",MINIMUM(a,b));
#endif
#ifndef MIN
printf("/40: The lower one is %d/n",MINIMUM(a,b));
#else
printf("/40: The larger one is %d/n",MAXIMUM(a,b));
#endif
#undef MAX
#ifdef MAX
printf("/40: The larger one is %d/n",MAXIMUM(a,b));
#else
printf("/40: The lower one is %d/n",MINIMUM(a,b));
#endif
#define MIN
#ifndef MIN
printf("/40: The lower one is %d/n",MINIMUM(a,b));
#else
printf("/40: The larger one is %d/n",MAXIMUM(a,b));
#endif
}

题目:#include 的应用练习

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程序源代码:
test.h 文件如下:
#define LAG >
#define SMA <
#define EQ ==
#include "test.h" /*一个新文件50.c,包含test.h*/
#include "stdio.h"
void main()
{ int i=10;
int j=20;
if(i LAG j)
printf("/40: %d larger than %d /n",i,j);
else if(i EQ j)
printf("/40: %d equal to %d /n",i,j);
else if(i SMA j)
printf("/40:%d smaller than %d /n",i,j);
else
printf("/40: No such value./n");
}

题目:学习使用按位与 & 。   

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程序分析:0&0=0; 0&1=0; 1&0=0; 1&1=1

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程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=077;
b=a&3;
printf("/40: The a & b(decimal) is %d /n",b);
b&=7;
printf("/40: The a & b(decimal) is %d /n",b);
}

题目:学习使用按位或 | 。

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程序分析:0|0=0; 0|1=1; 1|0=1; 1|1=1            

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程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=077;
b=a|3;
printf("/40: The a & b(decimal) is %d /n",b);
b|=7;
printf("/40: The a & b(decimal) is %d /n",b);
}

题目:学习使用按位异或 ^ 。   

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程序分析:0^0=0; 0^1=1; 1^0=1; 1^1=0

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程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=077;
b=a^3;
printf("/40: The a & b(decimal) is %d /n",b);
b^=7;
printf("/40: The a & b(decimal) is %d /n",b);
}

题目:取一个整数a从右端开始的4~7位。

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  程序分析:可以这样考虑:
(1)先使a右移4位。
(2)设置一个低4位全为1,其余全为0的数。可用~(~0<<4)
(3)将上面二者进行&运算。

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程序源代码:
main()
{
unsigned a,b,c,d;
scanf("%o",&a);
b=a>>4;
c=~(~0<<4);
d=b&c;
printf("%o/n%o/n",a,d);
}

题目:学习使用按位取反~。   

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程序分析:~0=1; ~1=0;

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程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=234;
b=~a;
printf("/40: The a's 1 complement(decimal) is %d /n",b);
a=~a;
printf("/40: The a's 1 complement(hexidecimal) is %x /n",a);
}

题目:画图,学用circle画圆形。

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程序源代码:
/*circle*/
#include "graphics.h"
main()
{
int driver,mode,i;
float j=1,k=1;
driver=VGA;mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(YELLOW);
for(i=0;i<=25;i++)
  {
   setcolor(8);
   circle(310,250,k);
   k=k+j;
   j=j+0.3;
  }
}

题目:画图,学用line画直线。

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程序源代码:
#include "graphics.h"
main()
{
int driver,mode,i;
float x0,y0,y1,x1;
float j=12,k;
driver=VGA;mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(GREEN);
x0=263;y0=263;y1=275;x1=275;
for(i=0;i<=18;i++)
  {
   setcolor(5);
   line(x0,y0,x0,y1);
   x0=x0-5;
   y0=y0-5;
   x1=x1+5;
   y1=y1+5;
   j=j+10;
  }
x0=263;y1=275;y0=263;
for(i=0;i<=20;i++)
  {
   setcolor(5);
   line(x0,y0,x0,y1);
   x0=x0+5;
   y0=y0+5;
   y1=y1-5;
  }
}

题目:画图,学用rectangle画方形。   

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程序分析:利用for循环控制100-999个数,每个数分解出个位,十位,百位。

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程序源代码:
#include "graphics.h"
main()
{
int x0,y0,y1,x1,driver,mode,i;
driver=VGA;mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(YELLOW);
x0=263;y0=263;y1=275;x1=275;
for(i=0;i<=18;i++)
  {
   setcolor(1);
   rectangle(x0,y0,x1,y1);
   x0=x0-5;
   y0=y0-5;
   x1=x1+5;
   y1=y1+5;
  }
settextstyle(DEFAULT_FONT,HORIZ_DIR,2);
outtextxy(150,40,"How beautiful it is!");
line(130,60,480,60);
setcolor(2);
circle(269,269,137);
}

题目:画图,综合例子。

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程序源代码:
# define PAI 3.1415926
# define B 0.809
# include "graphics.h"
#include "math.h"
main()
{
int i,j,k,x0,y0,x,y,driver,mode;
float a;
driver=CGA;mode=CGAC0;
initgraph(&driver,&mode,"");
setcolor(3);
setbkcolor(GREEN);
x0=150;y0=100;
circle(x0,y0,10);
circle(x0,y0,20);
circle(x0,y0,50);
for(i=0;i<16;i++)
  {
  a=(2*PAI/16)*i;
  x=ceil(x0+48*cos(a));
  y=ceil(y0+48*sin(a)*B);
  setcolor(2); line(x0,y0,x,y);}
   setcolor(3);circle(x0,y0,60);
/* Make 0 time normal size letters */
   settextstyle(DEFAULT_FONT,HORIZ_DIR,0);
   outtextxy(10,170,"press a key");
   getch();
   setfillstyle(HATCH_FILL,YELLOW);
   floodfill(202,100,WHITE);
   getch();
   for(k=0;k<=500;k++)
    {
    setcolor(3);
    for(i=0;i<=16;i++)
      {
      a=(2*PAI/16)*i+(2*PAI/180)*k;
      x=ceil(x0+48*cos(a));
      y=ceil(y0+48+sin(a)*B);
      setcolor(2); line(x0,y0,x,y);
     }
     for(j=1;j<=50;j++)
      {
       a=(2*PAI/16)*i+(2*PAI/180)*k-1;
       x=ceil(x0+48*cos(a));
       y=ceil(y0+48*sin(a)*B);
       line(x0,y0,x,y);
      }
  }
restorecrtmode();
}

题目:画图,综合例子。

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程序源代码:
#include "graphics.h"
#define LEFT 0
#define TOP 0
#define RIGHT 639
#define BOTTOM 479
#define LINES 400
#define MAXCOLOR 15
main()
{
int driver,mode,error;
int x1,y1;
int x2,y2;
int dx1,dy1,dx2,dy2,i=1;
int count=0;
int color=0;
driver=VGA;
mode=VGAHI;
initgraph(&driver,&mode,"");
x1=x2=y1=y2=10;
dx1=dy1=2;
dx2=dy2=3;
while(!kbhit())
{
 line(x1,y1,x2,y2);
 x1+=dx1;y1+=dy1;
 x2+=dx2;y2+dy2;
 if(x1<=LEFT||x1>=RIGHT)
 dx1=-dx1;
 if(y1<=TOP||y1>=BOTTOM)
  dy1=-dy1;
 if(x2<=LEFT||x2>=RIGHT)
  dx2=-dx2;
 if(y2<=TOP||y2>=BOTTOM)
  dy2=-dy2;
 if(++count>LINES)
 {
  setcolor(color);
  color=(color>=MAXCOLOR)?0:++color;
 }
}
closegraph();
}

题目:打印出杨辉三角形(要求打印出10行如下图)

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程序分析:
       1
      1  1
      1  2  1
      1  3  3  1
      1  4  6  4  1
      1  5  10 10 5  1

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程序源代码:
main()
{int i,j;
int a[10][10];
printf("/n");
for(i=0;i<10;i++)
 {a[0]=1;
 a=1;}
for(i=2;i<10;i++)
 for(j=1;j<i;j++)
 a[j]=a[i-1][j-1]+a[i-1][j];
for(i=0;i<10;i++)
 {for(j=0;j<=i;j++)
 printf("%5d",a[j]);
 printf("/n");
 }
}

题目:学习putpixel画点。

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程序源代码:
#include "stdio.h"
#include "graphics.h"
main()
{
int i,j,driver=VGA,mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(YELLOW);
for(i=50;i<=230;i+=20)
 for(j=50;j<=230;j++)
 putpixel(i,j,1);
for(j=50;j<=230;j+=20)
 for(i=50;i<=230;i++)
 putpixel(i,j,1);
}

题目:画椭圆ellipse

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程序源代码:
#include "stdio.h"
#include "graphics.h"
#include "conio.h"
main()
{
int x=360,y=160,driver=VGA,mode=VGAHI;
int num=20,i;
int top,bottom;
initgraph(&driver,&mode,"");
top=y-30;
bottom=y-30;
for(i=0;i<num;i++)
{
ellipse(250,250,0,360,top,bottom);
top-=5;
bottom+=5;
}
getch();
}

题目:利用ellipse and rectangle 画图。

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程序源代码:
#include "stdio.h"
#include "graphics.h"
#include "conio.h"
main()
{
int driver=VGA,mode=VGAHI;
int i,num=15,top=50;
int left=20,right=50;
initgraph(&driver,&mode,"");
for(i=0;i<num;i++)
{
ellipse(250,250,0,360,right,left);
ellipse(250,250,0,360,20,top);
rectangle(20-2*i,20-2*i,10*(i+2),10*(i+2));
right+=5;
left+=5;
top+=10;
}
getch();
}

题目:一个最优美的图案。   

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程序源代码:
#include "graphics.h"
#include "math.h"
#include "dos.h"
#include "conio.h"
#include "stdlib.h"
#include "stdio.h"
#include "stdarg.h"
#define MAXPTS 15
#define PI 3.1415926
struct PTS {
int x,y;
};
double AspectRatio=0.85;
void LineToDemo(void)
{
struct viewporttype vp;
struct PTS points[MAXPTS];
int i, j, h, w, xcenter, ycenter;
int radius, angle, step;
double rads;
printf(" MoveTo / LineTo Demonstration" );
getviewsettings( &vp );
h = vp.bottom - vp.top;
w = vp.right - vp.left;
xcenter = w / 2; /* Determine the center of circle */
ycenter = h / 2;
radius = (h - 30) / (AspectRatio * 2);
step = 360 / MAXPTS; /* Determine # of increments */
angle = 0; /* Begin at zero degrees */
for( i=0 ; i<MAXPTS ; ++i ){ /* Determine circle intercepts */
rads = (double)angle * PI / 180.0; /* Convert angle to radians */
points.x = xcenter + (int)( cos(rads) * radius );
points.y = ycenter - (int)( sin(rads) * radius * AspectRatio );
angle += step; /* Move to next increment */
}
circle( xcenter, ycenter, radius ); /* Draw bounding circle */
for( i=0 ; i<MAXPTS ; ++i ){ /* Draw the cords to the circle */
for( j=i ; j<MAXPTS ; ++j ){ /* For each remaining intersect */
moveto(points.x, points.y); /* Move to beginning of cord */
lineto(points[j].x, points[j].y); /* Draw the cord */
} } }
main()
{int driver,mode;
driver=CGA;mode=CGAC0;
initgraph(&driver,&mode,"");
setcolor(3);
setbkcolor(GREEN);
LineToDemo();}

题目:输入3个数a,b,c,按大小顺序输出。   

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程序分析:利用指针方法。

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程序源代码:
/*pointer*/
main()
{
int n1,n2,n3;
int *pointer1,*pointer2,*pointer3;
printf("please input 3 number:n1,n2,n3:");
scanf("%d,%d,%d",&n1,&n2,&n3);
pointer1=&n1;
pointer2=&n2;
pointer3=&n3;
if(n1>n2) swap(pointer1,pointer2);
if(n1>n3) swap(pointer1,pointer3);
if(n2>n3) swap(pointer2,pointer3);
printf("the sorted numbers are:%d,%d,%d/n",n1,n2,n3);
}
swap(p1,p2)
int *p1,*p2;
{int p;
p=*p1;*p1=*p2;*p2=p;
}

题目:输入数组,最大的与第一个元素交换,最小的与最后一个元素交换,输出

数组。

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程序分析:谭浩强的书中答案有问题。      

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程序源代码:
main()
{
int number[10];
input(number);
max_min(number);
output(number);
}
input(number)
int number[10];
{int i;
for(i=0;i<9;i++)
 scanf("%d,",&number);
 scanf("%d",&number[9]);
}
max_min(array)
int array[10];
{int *max,*min,k,l;
int *p,*arr_end;
arr_end=array+10;
max=min=array;
for(p=array+1;p<arr_end;p++)
 if(*p>*max) max=p;
 else if(*p<*min) min=p;
 k=*max;
 l=*min;
 *p=array[0];array[0]=l;l=*p;
 *p=array[9];array[9]=k;k=*p;
 return;
}
output(array)
int array[10];
{ int *p;
for(p=array;p<array+9;p++)
 printf("%d,",*p);
printf("%d/n",array[9]);
}

题目:有n个整数,使其前面各数顺序向后移m个位置,最后m个数变成最前面的m

个数

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程序分析:

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程序源代码:
main()
{
int number[20],n,m,i;
printf("the total numbers is:");
scanf("%d",&n);
printf("back m:");
scanf("%d",&m);
for(i=0;i<n-1;i++)
 scanf("%d,",&number);
scanf("%d",&number[n-1]);
move(number,n,m);
for(i=0;i<n-1;i++)
 printf("%d,",number);
printf("%d",number[n-1]);
}
move(array,n,m)
int n,m,array[20];
{
int *p,array_end;
array_end=*(array+n-1);
for(p=array+n-1;p>array;p--)
 *p=*(p-1);
 *array=array_end;
 m--;
 if(m>0) move(array,n,m);
}

题目:有n个人围成一圈,顺序排号。从第一个人开始报数(从1到3报数),凡

报到3的人退出圈子,问最后留下的是原来第几号的那位。

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程序分析:

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程序源代码:
#define nmax 50
main()
{
int i,k,m,n,num[nmax],*p;
printf("please input the total of numbers:");
scanf("%d",&n);
p=num;
for(i=0;i<n;i++)
 *(p+i)=i+1;
 i=0;
 k=0;
 m=0;
 while(m<n-1)
 {
 if(*(p+i)!=0) k++;
 if(k==3)
 { *(p+i)=0;
 k=0;
 m++;
 }
i++;
if(i==n) i=0;
}
while(*p==0) p++;
printf("%d is left/n",*p);
}

题目:写一个函数,求一个字符串的长度,在main函数中输入字符串,并输出其

长度。  

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程序分析:

___________________________________________________________________

程序源代码:
main()
{
int len;
char *str[20];
printf("please input a string:/n");
scanf("%s",str);
len=length(str);
printf("the string has %d characters.",len);
}
length(p)
char *p;
{
int n;
n=0;
while(*p!='/0')
{
 n++;
 p++;
}
return n;
}

题目:编写input()和output()函数输入,输出5个学生的数据记录。

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程序源代码:
#define N 5
struct student
{ char num[6];
 char name[8];
 int score[4];
} stu
;
input(stu)
struct student stu[];
{ int i,j;
 for(i=0;i<N;i++)
 { printf("/n please input %d of %d/n",i+1,N);
  printf("num: ");
  scanf("%s",stu.num);
  printf("name: ");
  scanf("%s",stu.name);
   for(j=0;j<3;j++)
   { printf("score %d.",j+1);
    scanf("%d",&stu.score[j]);
   }
  printf("/n");
 }
}
print(stu)
struct student stu[];
{ int i,j;
printf("/nNo. Name Sco1 Sco2 Sco3/n");
for(i=0;i<N;i++)
{ printf("%-6s%-10s",stu.num,stu.name);
 for(j=0;j<3;j++)
  printf("%-8d",stu.score[j]);
 printf("/n");
}
}
main()
{
 input();
 print();
}

题目:创建一个链表。

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程序源代码:
/*creat a list*/
#include "stdlib.h"
#include "stdio.h"
struct list
{ int data;
struct list *next;
};
typedef struct list node;
typedef node *link;
void main()
{ link ptr,head;
int num,i;
ptr=(link)malloc(sizeof(node));
ptr=head;
printf("please input 5 numbers==>/n");
for(i=0;i<=4;i++)
{
 scanf("%d",&num);
 ptr->data=num;
 ptr->next=(link)malloc(sizeof(node));
 if(i==4) ptr->next=NULL;
 else ptr=ptr->next;
}
ptr=head;
while(ptr!=NULL)
{ printf("The value is ==>%d/n",ptr->data);
 ptr=ptr->next;
}
}

题目:反向输出一个链表。

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程序源代码:
/*reverse output a list*/
#include "stdlib.h"
#include "stdio.h"
struct list
{ int data;
 struct list *next;
};
typedef struct list node;
typedef node *link;
void main()
{ link ptr,head,tail; 
 int num,i;
 tail=(link)malloc(sizeof(node));
 tail->next=NULL;
 ptr=tail;
 printf("/nplease input 5 data==>/n";
 for(i=0;i<=4;i++)
 {
  scanf("%d",&num);
  ptr->data=num;
  head=(link)malloc(sizeof(node));
  head->next=ptr;
  ptr=head;
 }
ptr=ptr->next;
while(ptr!=NULL)
{ printf("The value is ==>%d/n",ptr->data);
 ptr=ptr->next;
}}
语言的学习要从基础,100个经典的算法-3
题目:连接两个链表。

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程序源代码:
#include "stdlib.h"
#include "stdio.h"
struct list
{ int data;
struct list *next;
};
typedef struct list node;
typedef node *link;
link delete_node(link pointer,link tmp)
{if (tmp==NULL) /*delete first node*/
 return pointer->next;
else
{ if(tmp->next->next==NULL)/*delete last node*/
  tmp->next=NULL;
 else /*delete the other node*/
  tmp->next=tmp->next->next;
 return pointer;
}
}
void selection_sort(link pointer,int num)
{ link tmp,btmp;
 int i,min;
 for(i=0;i<num;i++)
 {
 tmp=pointer;
 min=tmp->data;
 btmp=NULL;
 while(tmp->next)
 { if(min>tmp->next->data)
 {min=tmp->next->data;
  btmp=tmp;
 }
 tmp=tmp->next;
 }
printf("/40: %d/n",min);
pointer=delete_node(pointer,btmp);
}
}
link create_list(int array[],int num)
{ link tmp1,tmp2,pointer;
int i;
pointer=(link)malloc(sizeof(node));
pointer->data=array[0];
tmp1=pointer;
for(i=1;i<num;i++)
{ tmp2=(link)malloc(sizeof(node));
 tmp2->next=NULL;
 tmp2->data=array;
 tmp1->next=tmp2;
 tmp1=tmp1->next;
}
return pointer;
}
link concatenate(link pointer1,link pointer2)
{ link tmp;
tmp=pointer1;
while(tmp->next)
 tmp=tmp->next;
tmp->next=pointer2;
return pointer1;
}
void main(void)
{ int arr1[]={3,12,8,9,11};
 link ptr;
 ptr=create_list(arr1,5);
 selection_sort(ptr,5);
}
题目:放松一下,算一道简单的题目。

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程序源代码:
main()
{
int i,n;
for(i=1;i<5;i++)
{ n=0;
 if(i!=1)
 n=n+1;
 if(i==3)
 n=n+1;
 if(i==4)
 n=n+1;
 if(i!=4)
 n=n+1;
 if(n==3)
  printf("zhu hao shi de shi:%c",64+i);
 }
}

题目:编写一个函数,输入n为偶数时,调用函数求1/2+1/4+...+1/n,当输入n为

奇数时,调用函数1/1+1/3+...+1/n(利用指针函数)

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程序源代码:
main()
#include "stdio.h"
main()
{
float peven(),podd(),dcall();
float sum;
int n;
while (1)
{
 scanf("%d",&n);
 if(n>1)
  break;
}
if(n%2==0)
{
 printf("Even=");
 sum=dcall(peven,n);
}
else
{
 printf("Odd=");
 sum=dcall(podd,n);
}
printf("%f",sum);
}
float peven(int n)
{
float s;
int i;
s=1;
for(i=2;i<=n;i+=2)
 s+=1/(float)i;
return(s);
}
float podd(n)
int n;
{
float s;
int i;
s=0;
for(i=1;i<=n;i+=2)
 s+=1/(float)i;
return(s);
}
float dcall(fp,n)
float (*fp)();
int n;
{
float s;
s=(*fp)(n);
return(s);
}

题目:填空练习(指向指针的指针)

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程序源代码:
main()
{ char *s[]={"man","woman","girl","boy","sister"};
char **q;
int k;
for(k=0;k<5;k++)
{       ;/*这里填写什么语句*/
 printf("%s/n",*q);
}
}

题目:找到年龄最大的人,并输出。请找出程序中有什么问题。

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程序源代码:
#define N 4
#include "stdio.h"
static struct man
{ char name[20];
int age;
} person
={"li",18,"wang",19,"zhang",20,"sun",22};
main()
{struct man *q,*p;
int i,m=0;
p=person;
for (i=0;i<N;i++)
{if(m<p->age)
 q=p++;
 m=q->age;}
printf("%s,%d",(*q).name,(*q).age);
}

题目:字符串排序。

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程序源代码:
main()
{
char *str1[20],*str2[20],*str3[20];
char swap();
printf("please input three strings/n");
scanf("%s",str1);
scanf("%s",str2);
scanf("%s",str3);
if(strcmp(str1,str2)>0) swap(str1,str2);
if(strcmp(str1,str3)>0) swap(str1,str3);
if(strcmp(str2,str3)>0) swap(str2,str3);
printf("after being sorted/n");
printf("%s/n%s/n%s/n",str1,str2,str3);
}
char swap(p1,p2)
char *p1,*p2;
{
char *p[20];
strcpy(p,p1);strcpy(p1,p2);strcpy(p2,p);
}

题目:海滩上有一堆桃子,五只猴子来分。第一只猴子把这堆桃子凭据分为五份

,多了一个,这只猴子把多的一个扔入海中,拿走了一份。第二只猴子把剩下的

桃子又平均分成五份,又多了一个,它同样把多的一个扔入海中,拿走了一份,

第三、第四、第五只猴子都是这样做的,问海滩上原来最少有多少个桃子?

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程序源代码:
main()
{int i,m,j,k,count;
for(i=4;i<10000;i+=4)
{ count=0;
m=i;
for(k=0;k<5;k++)
{
 j=i/4*5+1;
 i=j;
 if(j%4==0)
  count++;
 else
  break;
}
 i=m;
 if(count==4)
 {printf("%d/n",count);
  break;}
}
}

题目:809*??=800*??+9*??+1 其中??代表的两位数,8*??的结果为两位数,9*??

的结果为3位数。求??代表的两位数,及809*??后的结果。

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程序源代码:
output(long b,long i)
{ printf("/n%ld/%ld=809*%ld+%ld",b,i,i,b%i);
}
main()
{long int a,b,i;
a=809;
for(i=10;i<100;i++)
{b=i*a+1;
if(b>=1000&&b<=10000&&8*i<100&&9*i>=100)
output(b,i); }
}

题目:八进制转换为十进制

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程序源代码:
main()
{ char *p,s[6];int n;
p=s;
gets(p);
n=0;
while(*(p)!='/0')
{n=n*8+*p-'0';
p++;}
printf("%d",n);
}

题目:求0—7所能组成的奇数个数。

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程序源代码:
main()
{
long sum=4,s=4;
int j;
for(j=2;j<=8;j++)/*j is place of number*/
{ printf("/n%ld",sum);
if(j<=2)
s*=7;
else
s*=8;
sum+=s;}
printf("/nsum=%ld",sum);
}

题目:一个偶数总能表示为两个素数之和。

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程序源代码:
#include "stdio.h"
#include "math.h"
main()
{ int a,b,c,d;
scanf("%d",&a);
for(b=3;b<=a/2;b+=2)
{ for(c=2;c<=sqrt(b);c++)
if(b%c==0) break;
if(c>sqrt(b))
d=a-b;
else
break;
for(c=2;c<=sqrt(d);c++)
if(d%c==0) break;
if(c>sqrt(d))
printf("%d=%d+%d/n",a,b,d);
}
}

题目:判断一个素数能被几个9整除

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程序源代码:
main()
{ long int m9=9,sum=9;
int zi,n1=1,c9=1;
scanf("%d",&zi);
while(n1!=0)
{ if(!(sum%zi))
n1=0;
else
{m9=m9*10;
sum=sum+m9;
c9++;
}
}
printf("%ld,can be divided by %d /"9/"",sum,c9);
}

题目:两个字符串连接程序

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程序源代码:
#include "stdio.h"
main()
{char a[]="acegikm";
char b[]="bdfhjlnpq";
char c[80],*p;
int i=0,j=0,k=0;
while(a!='/0'&&b[j]!='/0')
{if (a { c[k]=a;i++;}
else
c[k]=b[j++];
k++;
}
c[k]='/0';
if(a=='/0')
p=b+j;
else
p=a+i;
strcat(c,p);
puts(c);
}

题目:回答结果(结构体变量传递)

___________________________________________________________________

程序源代码:
#include "stdio.h"
struct student
{ int x;
char c;
} a;
main()
{a.x=3;
a.c='a';
f(a);
printf("%d,%c",a.x,a.c);
}
f(struct student b)
{
b.x=20;
b.c='y';
}

题目:读取7个数(1—50)的整数值,每读取一个值,程序打印出该值个数的*



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程序源代码:
main()
{int i,a,n=1;
while(n<=7)
{ do {
   scanf("%d",&a);
   }while(a<1||a>50);
for(i=1;i<=a;i++)
 printf("*");
printf("/n");
n++;}
getch();
}

题目:某个公司采用公用电话传递数据,数据是四位的整数,在传递过程中是加

密的,加密规则如下:每位数字都加上5,然后用和除以10的余数代替该数字,再

将第一位和第四位交换,第二位和第三位交换。

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程序源代码:
main()
{int a,i,aa[4],t;
scanf("%d",&a);
aa[0]=a%10;
aa[1]=a%100/10;
aa[2]=a%1000/100;
aa[3]=a/1000;
for(i=0;i<=3;i++)
 {aa+=5;
 aa%=10;
 }
for(i=0;i<=3/2;i++)
 {t=aa;
 aa=aa[3-i];
 aa[3-i]=t;
 }
for(i=3;i>=0;i--)
printf("%d",aa);
}

题目:专升本一题,读结果。

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程序源代码:
#include "stdio.h"
#define M 5
main()
{int a[M]={1,2,3,4,5};
int i,j,t;
i=0;j=M-1;
while(i {t=*(a+i);
*(a+i)=*(a+j);
*(a+j)=t;
i++;j--;
}
for(i=0;i printf("%d",*(a+i));
}

题目:时间函数举例1

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程序源代码:
#include "stdio.h"
#include "time.h"
void main()
{ time_t lt; /*define a longint time varible*/
lt=time(NULL);/*system time and date*/
printf(ctime(<)); /*english format output*/
printf(asctime(localtime(<)));/*tranfer to tm*/
printf(asctime(gmtime(<))); /*tranfer to Greenwich time*/
}

题目:时间函数举例2

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程序源代码:
/*calculate time*/
#include "time.h"
#include "stdio.h"
main()
{ time_t start,end;
int i;
start=time(NULL);
for(i=0;i<3000;i++)
{ printf("/1/1/1/1/1/1/1/1/1/1/n");}
end=time(NULL);
printf("/1: The different is %6.3f/n",difftime(end,start));
}

题目:时间函数举例3

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程序源代码:
/*calculate time*/
#include "time.h"
#include "stdio.h"
main()
{ clock_t start,end;
int i;
double var;
start=clock();
for(i=0;i<10000;i++)
{ printf("/1/1/1/1/1/1/1/1/1/1/n");}
end=clock();
printf("/1: The different is %6.3f/n",(double)(end-start));
}

题目:时间函数举例4(一个猜数游戏,判断一个人反应快慢)。

___________________________________________________________________

程序源代码:
#include "time.h"
#include "stdlib.h"
#include "stdio.h"
main()
{char c;
clock_t start,end;
time_t a,b;
double var;
int i,guess;
srand(time(NULL));
printf("do you want to play it.('y' or 'n') /n");
loop:
while((c=getchar())=='y')
{
i=rand()%100;
printf("/nplease input number you guess:/n");
start=clock();
a=time(NULL);
scanf("%d",&guess);
while(guess!=i)
{if(guess>i)
{printf("please input a little smaller./n");
scanf("%d",&guess);}
else
{printf("please input a little bigger./n");
scanf("%d",&guess);}
}
end=clock();
b=time(NULL);
printf("/1: It took you %6.3f seconds/n",var=(double)(end-

start)/18.2);
printf("/1: it took you %6.3f seconds/n/n",difftime(b,a));
if(var<15)
printf("/1/1 You are very clever! /1/1/n/n");
else if(var<25)
printf("/1/1 you are normal! /1/1/n/n");
else
printf("/1/1 you are stupid! /1/1/n/n");
printf("/1/1 Congradulations /1/1/n/n");
printf("The number you guess is %d",i);
}
printf("/ndo you want to try it again?(/"yy/".or./"n/")/n");
if((c=getch())=='y')
goto loop;
}

题目:家庭财务管理小程序

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程序源代码:
/*money management system*/
#include "stdio.h"
#include "dos.h"
main()
{
FILE *fp;
struct date d;
float sum,chm=0.0;
int len,i,j=0;
int c;
char ch[4]="",ch1[16]="",chtime[12]="",chshop[16],chmoney[8];
pp: clrscr();
sum=0.0;
gotoxy(1,1);printf("|------------------------------------------------

---------------------------|");
gotoxy(1,2);printf("| money management system(C1.0) 2000.03 |");
gotoxy(1,3);printf("|------------------------------------------------

---------------------------|");
gotoxy(1,4);printf("| -- money records -- | -- today cost list -- |");
gotoxy(1,5);printf("| ------------------------ |---------------------

----------------|");
gotoxy(1,6);printf("| date: -------------- | |");
gotoxy(1,7);printf("| | | | |");
gotoxy(1,8);printf("| -------------- | |");
gotoxy(1,9);printf("| thgs: ------------------ | |");
gotoxy(1,10);printf("| | | | |");
gotoxy(1,11);printf("| ------------------ | |");
gotoxy(1,12);printf("| cost: ---------- | |");
gotoxy(1,13);printf("| | | | |");
gotoxy(1,14);printf("| ---------- | |");
gotoxy(1,15);printf("| | |");
gotoxy(1,16);printf("| | |");
gotoxy(1,17);printf("| | |");
gotoxy(1,18);printf("| | |");
gotoxy(1,19);printf("| | |");
gotoxy(1,20);printf("| | |");
gotoxy(1,21);printf("| | |");
gotoxy(1,22);printf("| | |");
gotoxy(1,23);printf("|-----------------------------------------------

----------------------------|");
i=0;
getdate(&d);
sprintf(chtime,"%4d.%02d.%02d",d.da_year,d.da_mon,d.da_day);
for(;;)
{
gotoxy(3,24);printf(" Tab __browse cost list Esc __quit");
gotoxy(13,10);printf(" ");
gotoxy(13,13);printf(" ");
gotoxy(13,7);printf("%s",chtime);
j=18;
ch[0]=getch();
if(ch[0]==27)
break;
strcpy(chshop,"");
strcpy(chmoney,"");
if(ch[0]==9)
{
mm:i=0;
fp=fopen("home.dat","r+");
gotoxy(3,24);printf(" ");
gotoxy(6,4);printf(" list records ");
gotoxy(1,5);printf("|-------------------------------------|");
gotoxy(41,4);printf(" ");
gotoxy(41,5);printf(" |");
while(fscanf(fp,"%10s%14s%f/n",chtime,chshop,&chm)!=EOF)
{ if(i==36)
{ getch();
i=0;}
if ((i%36)<17)
{ gotoxy(4,6+i);
printf(" ");
gotoxy(4,6+i);}
else
if((i%36)>16)
{ gotoxy(41,4+i-17);
printf(" ");
gotoxy(42,4+i-17);}
i++;
sum=sum+chm;
printf("%10s %-14s %6.1f/n",chtime,chshop,chm);}
gotoxy(1,23);printf("|-----------------------------------------------

----------------------------|");
gotoxy(1,24);printf("| |");
gotoxy(1,25);printf("|-----------------------------------------------

----------------------------|");
gotoxy(10,24);printf("total is %8.1f$",sum);
fclose(fp);
gotoxy(49,24);printf("press any key to.....");getch();goto pp;
}
else
{
while(ch[0]!='/r')
{ if(j<10)
{ strncat(chtime,ch,1);
j++;}
if(ch[0]==8)
{
len=strlen(chtime)-1;
if(j>15)
{ len=len+1; j=11;}
strcpy(ch1,"");
j=j-2;
strncat(ch1,chtime,len);
strcpy(chtime,"");
strncat(chtime,ch1,len-1);
gotoxy(13,7);printf(" ");}
gotoxy(13,7);printf("%s",chtime);ch[0]=getch();
if(ch[0]==9)
goto mm;
if(ch[0]==27)
exit(1);
}
gotoxy(3,24);printf(" ");
gotoxy(13,10);
j=0;
ch[0]=getch();
while(ch[0]!='/r')
{ if (j<14)
{ strncat(chshop,ch,1);
j++;}
if(ch[0]==8)
{ len=strlen(chshop)-1;
strcpy(ch1,"");
j=j-2;
strncat(ch1,chshop,len);
strcpy(chshop,"");
strncat(chshop,ch1,len-1);
gotoxy(13,10);printf(" ");}
gotoxy(13,10);printf("%s",chshop);ch[0]=getch();}
gotoxy(13,13);
j=0;
ch[0]=getch();
while(ch[0]!='/r')
{ if (j<6)
{ strncat(chmoney,ch,1);
j++;}
if(ch[0]==8)
{ len=strlen(chmoney)-1;
strcpy(ch1,"");
j=j-2;
strncat(ch1,chmoney,len);
strcpy(chmoney,"");
strncat(chmoney,ch1,len-1);
gotoxy(13,13);printf(" ");}
gotoxy(13,13);printf("%s",chmoney);ch[0]=getch();}
if((strlen(chshop)==0)||(strlen(chmoney)==0))
continue;
if((fp=fopen("home.dat","a+"))!=NULL);
fprintf(fp,"%10s%14s%6s",chtime,chshop,chmoney);
fputc('/n',fp);
fclose(fp);
i++;
gotoxy(41,5+i);
printf("%10s %-14s %-6s",chtime,chshop,chmoney);
}}}

题目:计算字符串中子串出现的次数

___________________________________________________________________

程序源代码:
#include "string.h"
#include "stdio.h"
main()
{ char str1[20],str2[20],*p1,*p2;
int sum=0;
printf("please input two strings/n");
scanf("%s%s",str1,str2);
p1=str1;p2=str2;
while(*p1!='/0')
{
if(*p1==*p2)
{while(*p1==*p2&&*p2!='/0')
{p1++;
p2++;}
}
else
p1++;
if(*p2=='/0')
sum++;
p2=str2;
}
printf("%d",sum);
getch();
}

题目:从键盘输入一些字符,逐个把它们送到磁盘上去,直到输入一个#为止。

___________________________________________________________________

程序源代码:
#include "stdio.h"
main()
{ FILE *fp;
char ch,filename[10];
scanf("%s",filename);
if((fp=fopen(filename,"w"))==NULL)
{printf("cannot open file/n");
exit(0);}
ch=getchar();
ch=getchar();
while(ch!='#')
{fputc(ch,fp);putchar(ch);
ch=getchar();
}
fclose(fp);
}

题目:从键盘输入一个字符串,将小写字母全部转换成大写字母,然后输出到一

个磁盘文件“test”中保存。输入的字符串以!结束。

___________________________________________________________________

程序源代码:
#include "stdio.h"
main()
{FILE *fp;
char str[100],filename[10];
int i=0;
if((fp=fopen("test","w")==NULL)
{ printf("cannot open the file/n";
exit(0);}
printf("please input a string:/n";
gets(str);
while(str!='!')
{ if(str>='a'&&str<='z')
str=str-32;
fputc(str,fp);
i++;}
fclose(fp);
fp=fopen("test","r";
fgets(str,strlen(str)+1,fp);
printf("%s/n",str);
fclose(fp);
}

题目:有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并

(按字母顺序排列),输出到一个新文件C中。

___________________________________________________________________

程序源代码:
#include "stdio.h"
main()
{ FILE *fp;
int i,j,n,ni;
char c[160],t,ch;
if((fp=fopen("A","r"))==NULL)
{printf("file A cannot be opened/n");
exit(0);}
printf("/n A contents are :/n");
for(i=0;(ch=fgetc(fp))!=EOF;i++)
{c=ch;
putchar(c);
}
fclose(fp);
ni=i;
if((fp=fopen("B","r"))==NULL)
{printf("file B cannot be opened/n");
exit(0);}
printf("/n B contents are :/n");
for(i=0;(ch=fgetc(fp))!=EOF;i++)
{c=ch;
putchar(c);
}
fclose(fp);
n=i;
for(i=0;i<n;i++)
for(j=i+1;j<n;j++)
if(c>c[j])
{t=c;c=c[j];c[j]=t;}
printf("/n C file is:/n");
fp=fopen("C","w");
for(i=0;i<n;i++)
{ putc(c,fp);
putchar(c);
}
fclose(fp);
}

题目:有五个学生,每个学生有3门课的成绩,从键盘输入以上数据(包括学生

号,姓名,三门课成绩),计算出平均成绩,况原有的数据和计算出的平均分数

存放在磁盘文件"stud"中。

___________________________________________________________________

程序源代码:
#include "stdio.h"
struct student
{ char num[6];
char name[8];
int score[3];
float avr;
} stu[5];
main()
{int i,j,sum;
FILE *fp;
/*input*/
for(i=0;i<5;i++)
{ printf("/n please input No. %d score:/n",i);
printf("stuNo:");
scanf("%s",stu.num);
printf("name:");
scanf("%s",stu.name);
sum=0;
for(j=0;j<3;j++)
{ printf("score %d.",j+1);
scanf("%d",&stu.score[j]);
sum+=stu.score[j];
}
stu.avr=sum/3.0;
}
fp=fopen("stud","w");
for(i=0;i<5;i++)
if(fwrite(&stu,sizeof(struct student),1,fp)!=1)
printf("file write error/n");
fclose(fp);
}
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