输入年月日，求这天是今年第几天的问题
#include<stdio.h>
int main()
{
    int a,b,c,t;
    while(scanf("%d%d%d",&a,&b,&c)!=EOF)
    {
        if(a%4==0 && a%100!=0 || a%400==0)
        t=29;
        else
        t=28;
    switch(b)
    {
    catch 1; pfintf("%d\n",c);break;
    catch 2; pfintf("%d\n",31+c);break;
    catch 3; pfintf("%d\n",31+t+c);break;
    catch 4; pfintf("%d\n",31+t+31+c);break;
    catch 5; pfintf("%d\n",31+t+31+30+t);break;
    catch 6; pfintf("%d\n",31+t+31+30+31+t);break;
    catch 7; pfintf("%d\n",31+t+31+30+31+30+t);break;
    catch 8; pfintf("%d\n",31+t+31+30+31+30+31+c);break;
    catch 9; pfintf("%d\n",31+t+31+30+31+30+31+31+c);break;
    catch 10; pfintf("%d\n",31+t+31+30+31+30+31+31+30+c);break;
    catch 11; pfintf("%d\n"31+t+31+30+31+30+31+31+30+31+t,);break;
    catch 12; pfintf("%d\n"31+t+31+30+31+30+31+31+30+31+30+t,);break;
    }
    }  
}

#include<stdio.h>
int main()
{
    int a,b,c,t;
    while(scanf("%d%d%d",&a,&b,&c)!=EOF)
    {
        if(a%4==0 && a%100!=0 || a%400==0)
        t=29;
        else
        t=28;
        switch(b)
        {
            catch 1; pfintf("%d\n",c);break;
            catch 2; pfintf("%d\n",31+c);break;
            catch 3; pfintf("%d\n",31+t+c);break;
            catch 4; pfintf("%d\n",31+t+31+c);break;
            catch 5; pfintf("%d\n",31+t+31+30+t);break;
            catch 6; pfintf("%d\n",31+t+31+30+31+t);break;
            catch 7; pfintf("%d\n",31+t+31+30+31+30+t);break;
            catch 8; pfintf("%d\n",31+t+31+30+31+30+31+c);break;
            catch 9; pfintf("%d\n",31+t+31+30+31+30+31+31+c);break;
            catch 10; pfintf("%d\n",31+t+31+30+31+30+31+31+30+c);break;
            catch 11; pfintf("%d\n"，31+t+31+30+31+30+31+31+30+31+t);break;
            catch 12; pfintf("%d\n"，31+t+31+30+31+30+31+31+30+31+30+t);break;
        }
    }  
}
上传时有误，修改了一下

额，突然发先是case而不是catch。实在是抱歉啊。

懂了，错好多啊，要用心学习啊