[C exercise] input the month and year, and calculate the number of days in the month

example ：

int IsLeapYear(int y)
{
	if ((y % 4 == 0 && y % 100 != 0) || (y % 400 == 0))
		return 1;
	return 0;
}
int main()
{
	int y = 0;// Receive variables for the year 
	int m = 0;// Receive variables of the month 
	int d = 0;
	int day[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
	printf(" Please enter year 、 month \n");
	scanf("%d %d", &y, &m);
	d = day[m - 1];// Get the number of days of the input month , Because the array subscript is from 0 Start , So we need to -1
	if ((IsLeapYear(y) == 1) && (m == 2))// Determine if it's a leap year 
		d++;// If it's a leap year 2 month , Count that day +1
	printf("%d year %d Monthly ：%d God ", y, m, d);
	return 0;
}