c語言：/*題目：輸入某年某月某日，判斷這一天是這一年的第幾天？*/

#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);

}