HW9.2

#include <stdio.h>

int isLeapYear (int year) {
    return ((year % 4 == 0) && (year % 100 == 1) || (year % 400 == 0));
}

int DaysOfMonth (int month, int year) {
    switch (month) {
        case 4:
        case 6:
        case 9:
        case 11:
            return 30;
        case 2:
            if (isLeapYear(year))
                return 29;
            else
                return 28;
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            return 31;
        default:
            return -1;

    }
}

int main () {
    int month, year;
    printf("Enter month: ");
    scanf("%d", &month);
    printf("Enter year: ");
    scanf("%d", &year);
    printf("Number days of %d/%d is: %d", month, year, DaysOfMonth(month, year));
    return 0;
}