C Primer Plus 6 第五章编程练习

1.

#include<stdio.h>
#define M 60	//一小时等于60分钟

int main(void)
{
int hour;	//小时格式
int min;	//分钟格式
int a;	//小时分钟格式中的分钟

printf("Please enter a time(min):");
scanf("%d", &min);
while(min>0)
{
hour = min / M;	//小时
a = min % M;	//分钟
printf("%d min is %d hour %d min.\n", min, hour, a);
printf("Do you want to exit, enter a time(time<=0).\n");
scanf("%d", &min);
}
printf("Done!\n");
return 0;
}

2.//打印包括输入数在内的比输入数大10的所有整数
#include<stdio.h>
int main(void)
{
int a; //用户输入数
int i = 0; //计数器
printf("Enter a number(int):");
scanf("%d", &a);
printf("%d", a); //原数

while(++i<=10) //打印10次
{
a++;
printf(" %d", a); //各数间空一格
}
printf("\n"); //最后一个数打印之后换行
return 0;
}


3.//将天数以"XX周XX天"的格式显示
#include<stdio.h>
#define M 7 //一周=7天

int main(void)
{
int day;
int week;
int left;

printf("Enter a day number:");
scanf("%d", &day);

while(day>0)
{
week = day / M; //周
left = day % M; //天
printf("%d is %d week, %d day.\n", day, week, left);
printf("you can continue(enter 0 to quit):");
scanf("%d", &day);
}
printf("Done!\n");
return 0;
}


4.//将XX厘米用"XX英寸XX英尺"的格式显示
#include<stdio.h>
#define M 30.48 //一英尺=30.48厘米
#define N 2.54 //一英寸=2.54厘米

int main(void)
{
float cm;
int feet; //利用int型进行截断
float inch;
float left; //阶段部分转换成英寸

printf("Enter your height in centimeters:");
scanf("%f", &cm);

while(cm>0)
{
feet = cm / M;
left = cm - (feet * M);
inch = left / N;
printf("%.1f cm = %d feet, %.1f inchs\n", cm, feet, inch);
printf("Enter your height in cmtimeters(<=0 to quit):");
scanf("%f", &cm);
}
printf("Done!\n");
return 0;
}


5.#include <stdio.h>
int main(void)
{
int count, sum;
int i;

count = 0;
sum = 0;
printf("Enter the number of your workdays:");
scanf("%d", &i);

while(count++<i)
{
sum = sum + count;
}
printf("sum = %d\n", sum);

return 0;
}


6.//计算整数的平方
#include<stdio.h>
int main(void)
{
int m;
int n;
int i;

m = 0;
n = 0;

printf("Enter a number:");
scanf("%d", &i);

while(m++<i)
{
n = m * m;
printf("%d:\t%d\n", m, n);
}
return 0;
}


7.//设计一个计算并打印浮点数立方值的函数
#include<stdio.h>
void three(double n); //函数原型

int main(void)
{
double m;

printf("Enter a number(double):");
scanf("%lf", &m); //lf(小写)转换说明表明读入double类型的值,Lf则是long double类型!
three(m); //函数调用(实参)

return 0;
}
void three(double n) //形参
{
printf("%.2lf:\t%.2lf\n", n, n*n*n);
}


8.//求模运算
#include<stdio.h>
int main(void)
{
const int b; //运算对象2
int a; //运算对象1

printf("This program computes moduli.\n");
printf("Enter a integer to serve as the second operand:");
scanf("%d", &b);
printf("Enter the first operand:");
scanf("%d", &a);
printf("%d %% %d is %d\n", a, b, a%b);

while(a>0)
{
printf("Enter next number for first operand(<=0 to quit):");
scanf("%d", &a);
printf("%d %% %d is %d\n", a, b ,a%b);
printf("Enter next number for first operand(<=0 to quit):");
scanf("%d", &a);
}
printf("Done!\n");
return 0;
}


9.//华氏温度转摄氏温度和开氏温度
#include<stdio.h>
void Temperatures(double x); //函数原型
int main(void)
{
double m; //华氏温度值

printf("输入一个华氏温度值：");
while(scanf("%lf", &m)==1) //scanf()函数返回读取数据的数量，若读取数字则返回1，读取字符则不返回1
{
Temperatures(m);
printf("输入一个华氏温度：");
scanf("%lf", &m);
}
printf("Done!\n");

return 0;
}
//函数功能：将华氏温度转换为摄氏温度和开氏温度并打印三个值
void Temperatures(double x)
{
const double a = 5.0;
const double b = 9.0;
const double c = 32.0;
const double d = 273.16;
double n; //摄氏温度
double k; //开氏温度

n = a / b * (x - c); //计算摄氏温度
k = n + d; //计算开氏温度

printf("华氏温度\t摄氏温度\t开氏温度\n");
printf("%-15.2lf\t%-15.2lf\t%-15.2lf\n", x, n, k);
}