c语言：/*题目：输入某年某月某日，判断这一天是这一年的第几天？*/

#include <stdio.h>
#include <stdlib.h>

void  main()
{
    int  y,m,d,day;
    scanf("%d,%d,%d" ,&y,&m,&d);
    switch (m)
    {
    case  1:day = 0; break ;
    case  2:day = 31; break ;
    case  3:day = 59; break ;
    case  4:day = 90; break ;
    case  5:day = 120; break ;
    case  6:day = 151; break ;
    case  7:day = 181; break ;
    case  8:day = 212; break ;
    case  9:day = 243; break ;
    case  10:day = 273; break ;
    case  11:day = 304; break ;
    case  12:day = 335; break ;
    }
    day = day + d;
    if ((m%400 == 0) || (m%4 == 0) && (m%100 == 0))
        day = day+1;

    printf("%d-%d-%d是%d年得第%d天/n" ,y,m,d,y,day);

}