我在网上看见了代码，很好自己也照着写了下。可是它无法运行（一敲回车它就出错，自动关闭）！这纠结死我了，请大家指导下。这代码其实很好的（我认为）。谢谢啦！
#include<stdio.h>
void main()
{
    int a,b,c,sum=0;
    int e[12]={31,28,31,30,31,30,31,31,30,31,30,31};
    int i,d;
    scanf("%d%d%d",a,b,c);
    for(i=1;i<a;i++)
    {
        sum+=365;
    if(a%4==0&&a%100!=0||a%400==0)
        sum++;
    }
    for(i=0;i<b;i++)
        sum+=e[i];
        if(b>1)
            if(a%4==0&&a%100!=0||a%400==0)
                sum++;
    sum+=c;
    d=sum%7;
    switch(d)
    {
    case 0:printf("Sunday\n");break;
    case 1:printf("Monday\n");break;
    case 2:printf("Tuesday\n");break;
    case 3:printf("Wednesday\n");break;
    case 4:printf("Thursday\n");break;
    case 5:printf("Friday\n");break;
    case 6:printf("Sunday\n");break;
    }
}

scanf("%d%d%d",&a,&b,&c);//a,b,c);

你这代码  能算出来 是星期几吗

a,b,c的赋值没地址符，if的判断框，最好加上括号。

  scanf("%d%d%d",a,b,c);改成  scanf("%d%d%d",&a,&b,&c);

#include<stdio.h>
void main()
{
    int a,b,c,sum=0;
    int e[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};//有改
    int i,d;
    scanf("%d %d %d",&a,&b,&c);//a,b,c);
    for(i=1900 ;i<a;i++)//有改
    {
        sum+=365;
        if(i%4==0 && i%100!=0||i%400==0)//有改
            sum++;
    }

    for(i=0;i<b;i++)
        sum+=e[i];

        if(b>1)
        { 
            if(a%4==0&&a%100!=0||a%400==0)
                sum++;
        }

    sum+=c;
    d=sum%7;
    switch(d)
    {
    case 0:printf("Sunday\n");break;
    case 1:printf("Monday\n");break;
    case 2:printf("Tuesday\n");break;
    case 3:printf("Wednesday\n");break;
    case 4:printf("Thursday\n");break;
    case 5:printf("Friday\n");break;
    case 6:printf("Sunday\n");break;
    }
}

同二楼解

#include<stdio.h>
void main()
{
    int a,b,c,sum=0;
    int e[12]={31,28,31,30,31,30,31,31,30,31,30,31};
    int i,d;
    scanf("%d%d%d",&a,&b,&c);//有改//
    for(i=1900;i<a;i++)//有改//
    {
        sum+=365;
    if(i%4==0&&i%100!=0||i%400==0)
        sum++;
    }
    for(i=1;i<b;i++)//有改//
        sum+=e[i];
        if(b>1)
        {if(a%4==0&&a%100!=0||a%400==0)
                sum++;
        }
    sum+=c;
    d=sum%7;
    switch(d)
    {
    case 0:printf("Sunday\n");break;
    case 1:printf("Monday\n");break;
    case 2:printf("Tuesday\n");break;
    case 3:printf("Wednesday\n");break;
    case 4:printf("Thursday\n");break;
    case 5:printf("Friday\n");break;
    case 6:printf("Saturday\n");break;//有改//
    }
}