C语言打印万年历

//打印万年历从1900年起
#ifndef DATE_H
#define DATE_H
#include <string.h>
#define OUT_OF_YEAR -1
//是否是闰年
bool isLeap(int year){
if(year<1900) return OUT_OF_YEAR;
return (year%4==0)&&(year%100!=0)||(year%400==0);
}
//从year到1900年间闰年个数
int  LeapYearNum(int year){
if(year<1900) return OUT_OF_YEAR;
int LeapYear=0;
for (int i=1900;i<=year;i++)
{
if(isLeap(i)){
++LeapYear;
}
}
return LeapYear;
}
//到year开始到1900年的天数
int GetDayNum(int year){
if(year<1900) return OUT_OF_YEAR;
return LeapYearNum(year)+(year-1900)*365;
}
//year年,mounth月的天数
int GetDayOfMouth(int year,int mounth){
if (year<1900 || mounth<1||mounth>12) return OUT_OF_YEAR;
int dayNum=0;
switch (mounth)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
dayNum=31;
break;
case 4:
case 6:
case 9:
case 11:
dayNum=30;
break;
case 2:
if(isLeap(year)){
dayNum=29;
}else{
dayNum=28;
}
break;
default:
dayNum=0;
}
return dayNum;
}
//到1900年的天数
int getDay(int year,int mouth){
int mouthDay=0;
for (int i=1;i<mouth;i++)
{
mouthDay+=GetDayOfMouth(year,i);
}
return GetDayNum(year)+mouthDay;
}
int getWeek(int year,int mouth){
return getDay(year,mouth)%7+1;
}
//得到星期英文缩写
char* getWeekChar(int i){
if (i<1||i>7) return "";
char *WeekChar="   ";
switch(i){
case 1:
WeekChar="Mon";
break;
case 2:
WeekChar="Tue";
break;
case 3:
WeekChar="Wed";
break;
case 4:
WeekChar="Thu";
break;
case 5:
WeekChar="Fri";
break;
case 6:
WeekChar="Sat";
break;
case 7:
WeekChar="Sun";
break;
default:
WeekChar="";
}
return WeekChar;

}
//打印月份
void printMouth(int year,int mouth){
int startWeek=getWeek(year,mouth);
int days=GetDayOfMouth(year,mouth);
printf("*********************%d年%d月******************************\n",year,mouth);
int dayIndex=1;
printf("\n");
for (int i=1;i<=7;i++)
{
printf(" %s\t",getWeekChar(i));
}
printf("\n");
for (int i=1;i<=50;i++)
{
if (dayIndex>days) break;
if (i<startWeek)
{
printf("   \t");
}else{
printf("%4d\t",dayIndex);
dayIndex++;
}
if (i%7==0) printf("\n");
}
printf("\n");
}
#endif

#include <stdio.h>
#include "Date.h"
int main( void )
{

printMouth(2013,10);

}

*********************2013年10月******************************

Mon     Tue     Wed     Thu     Fri     Sat     Sun
1       2       3       4       5       6
7       8       9      10      11      12      13
14      15      16      17      18      19      20
21      22      23      24      25      26      27
28      29      30      31
请按任意键继续. . .