7-2 计算天数 (15分)

#include <stdio.h>
int main()
{
    int y,m,d;
    int days;
    int i;
    int a[13]= {0,31,28,31,30,31,30,31,31,30,31,30,31};
    scanf("%d/%d/%d",&y,&m,&d);
    
        days=d;
        for(i=1; i<m; i++)
        {
            days+=a[i];
        }
        if(m>2 && ((y%4==0 && y%100!=0)||y%400==0))
            days++;
        printf("%d\n",days);
    
    return 0;
}