小程序_日期

/****************************************************************
题目：输入某年某月某日，判断这一天是这一年的第几天？
1.程序分析：以3月5日为例，应该先把前两个月的加起来，
然后再加上5天即本年的第几天，特殊情况，闰年且输入月份大于3时
需考虑多加一天。
判断润年year%4==0&&year%100!=0||year%400==0
*****************************************************************/

#include <stdio.h>

void main(void)
{
int year = 0;
int month = 0;
int day = 0;
int leap = 0;
int num = 0;

while(1)
{
printf("Please input year, month, day ! ");
scanf("%d,%d,%d",&year,&month,&day);

leap = 0;
num = 0;
if((0==year%4)&&(0 != year%100)||(0 == year%400))
{
leap = 1;
}


switch(month)
{
case 12:
num = num+30;
case 11:
num = num+31;
case 10:
num = num+30;
case 9:
num = num+31;
case 8:
num = num+31;
case 7:
num = num+30;
case 6:
num = num+31;
case 5:
num = num+30;
case 4:
num = num+31;
case 3:
num = num+28+leap;
case 2:
num = num+31;
case 1:
num = day+num;
printf("It is %d day of the year ",num);
break;
default:
printf("Pls check invaild month!");
break;
}
fflush(stdin);

}

}