这个程序哪有错?

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代码发过来

#include <stdio.h>
void mian()
{
int y,week,days,i,n,j;
scanf("%d",&y);
for(j=1;j<=12;j++){
switch(j){
case 1:printf("一月\n");days=31;break;
case 2:printf("二月\n");days=28;break;
case 3:printf("三月\n");days=31;break;
case 4:printf("四月\n");days=30;break;
case 5:printf("五月\n");days=31;break;
case 6:printf("六月\n");days=30;break;
case 7:printf("七月\n");days=31;break;
case 8:printf("八月\n");days=31;break;
case 9:printf("九月\n");days=30;break;
case 10:printf("十月\n");days=31;break;
case 11:printf("十一月\n");days=30;break;
case 12:printf("十二月\n");days=31;break;
}
if((y%400==0||y%4==0&&y%100)&&j==2){
days=29;
}
printf(" sun mon tue wed thu fri sat\n");
for(i=1;i<=4*week;i++){
printf(" ");
}
n=week;
for(i=1;i<=days;i++){
printf("%4d",i);
n++;
if(n%7==0){
printf("\n");
}
}
printf("\n");
}
}

在线等