# include"stdio.h"
int main(void)
{
    int year; int leap;
    scanf("%d",&year);
        if((year%4==0 && year%100!=0) || (year%400==0));
          leap=1;
        else
          leap=0;
    if(leap)
       printf("%d is",year);
    else
       printf("%d is not",year);
    printf("a leap year.\n");
    getchar();
    return 0;         
}

找出来了,多了分号

if((year%4==0 && year%100!=0) || (year%400==0))
          leap=1;
是一条语句，楼主写成两条语句！

#include "stdio.h"
void main()
{int year;
printf("please input the year");
scanf("%d",&year);
if( (year%4==0&&year%100!=0)||(year%400==0))
printf("%d is a leap year.\n",year);
else
printf("%d is nor a leap year.\n",year);
}
这样简单一点