# 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