编程求闰年

# include<stdio.h>
# include<windows.h>
void main()
{
    int year, leap;
    printf("please enter a year:");
    scanf("%d", &year);
    if (year % 4 != 0) leap = 0;                 /*不能被4整除不是闰年*/
    else if (year % 100 != 0) leap = 1;          /*不能被100整除是闰年*/
    else if (year % 400 != 0) leap = 0;          /*不能被400整除不是闰年*/
    else leap = 1;                               /*其余都是闰年*/
    if (leap)
        printf("%d is ", year);
    else
        printf("%d is not ", year);
    printf("a leap year\n");
    system("pause");
}