#include<stdio.h>
int main()
{
    int a,b,c,i,sum,d[12]={31,28,31,30,31,30,31,31,30,31,30,31};
    while(scanf("%d%d%d",&a,&b,&c)!=EOF)
        {
            sum=0;
            for(i=0;i<b-1;i++)
            sum+=d[i];
            sum+=c;

            if(b>=3&&(a%400==0||a%4==0&&a%100!=0))
            sum++;
            printf("%d",sum);
        }
   
return 0;
}

输出格式不符合要求。
在输出后面加一个换行符'\n'

#include <stdio.h>

int ping[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
int run[] = {0,31,29,31,30,31,30,31,31,30,31,30,31};

bool f(int year)
{
    if(year % 4 == 0 && year % 100 != 0 ||
        year % 400 == 0)
        return true;
    return false;
}

int main()
{
    int m,n,s;
    int i,j;
    while(EOF != scanf("%d/%d/%d",&m,&n,&s))
    {
        if(f(m))
            for(j = 0,i = 1;i<n;i++)j += run[i];
        else
            for(j = 0,i = 1;i<n;i++)j += ping[i];
        printf("%d\n",j+s);
    }
    return 0;
}

闲着无聊 刷两个题  给你参考下吧