C語言 實現一個函數判斷year是不是潤年

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include<stdlib.h>
int bissextile(year)
{
    if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0))
        return 1;
    else
        return 0;
}
int main()
{
    int year=0 ;
    int ret = 0;
    printf("請輸入年份：");
    scanf("%d",&year);
    printf("\n");
    ret = bissextile(year);
    if (ret == 1)
        printf("%d是閏年\n", year);
    else
        printf("%d不是閏年\n", year);
    system("pause");
    return 0;
}