编辑代码

#include <stdio.h>
int main()
{
    int year=0;
    int month =0;
    int day=0;
    int sum = 0;
    scanf("%d%d%d",&year,&month,&day);
    for(int i=1;i<month;i++)
    {
        switch(i)
        {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            sum+=31;
            break;
            case 2:
            if(year%400==0 || (year %4==0 && year %100 == 0))
            sum+=29;
            else
            sum+=28;
            break;
            case 4:
            case 6:
            case 9:
            case 11:
            sum+=30;
            break;
        }

    }
    sum+=day;
    printf("%d",sum);
    return 0;
}