int isLeapYear(int year) {

    if (year % 4 == 0) {
        if (year % 100 == 0) { // Checking for a century year
            if (year % 400 == 0) {
                return 1;
            }
            else {
                return 0;
            }
        } else {
            return 1;
        }
    } else {
        return 0;
    }

}