8月份 只能加 8天

#include <stdio.h>
int main()
{
    int year = 2008;
    int month = 8;
    int day =8;
    int sum,i;
    if((year%4==0&&year%100!=0)||year%400==0)
   {
    i=29;
   }
    else
    {
    i=28;
    }
   
    switch(month)
{
    case 1:sum=31;break;
    case 2:sum=31+i;break;
    case 3:sum=31+i+31;break;
    case 4:sum=31+i+31+30;break;
    case 5:sum=31+i+31+30+31;break;

 case 6:sum=31+i+31+30+31+30;break;

     case 7:sum=31+i+31+30+31+30+31;break;
    case 8:sum=31+i+31+30+31+30+31+31;break;
    case 9:sum=31+i+31+30+31+30+31+31+30;break;
    case 10:sum=31+i+31+30+31+30+31+31+30+31;break;
    case 11:sum=31+i+31+30+31+30+31+31+30+31+30;break;
    case 12:sum=31+i+31+30+31+30+31+31+30+31+30+31;break;

}
    sum+=day;
printf("%d年%d月%d日是该年的第%d天",year,month,day,sum);
    return 0;
}