// User inputs three integers: for month, day, and year.
// Program outputs whether or not the date is in a leap year.
// Author: Brian Brindle

#include <stdio.h>

void main()
{
	int month,date,year;

	printf("Please enter the month and date...>");
	scanf("\n%d %d",&month,&date);

	printf("\nPlease enter the year...>");
	scanf("\n%d",&year);

	switch (month)
	{
    case 1:
		printf("January\n");
		if (date <1 || date> 31)
			printf("Invalid day\n");
		break;
	case 2:
		printf("February\n");
		if (year%400==0 || (year%4==0 && year%100!=0))
		{
			if (date < 1 || date > 29)
				printf("Invalid day\n");
		}
		else 
		{
			if (date < 1 || date > 28)
				printf("Invalid day\n");
		}
		break;
	case 3:
        printf("March\n");
		if (date <1 || date> 31)
			printf("Invalid day\n");
		break;
	case 4:
		printf("April\n");
		if (date <1 || date> 30)
			printf("Invalid day\n");
		break;
	case 5:
		printf("May\n");
		if (date < 1 || date > 31)
			printf("Invalid day\n");
		break;
	case 6:
		printf("June\n");
		if (date < 1 || date > 30)
			printf("Invalid day\n");
		break;
	case 7:
		printf("July\n");
		if (date < 1 || date > 31)
			printf("Invalid day\n");
		break;
	case 8:
		printf("August\n");
		if (date < 1 || date > 31)
			printf("Invalid day\n");
		break;
	case 9:
		printf("September\n");
		if (date < 1 || date > 30)
			printf("Invalid day\n");
		break;
	case 10:
		printf("October\n");
		if (date < 1 || date > 31)
			printf("Invalid day\n");
		break;
	case 11:
		printf("November\n");
		if (date < 1 || date > 30)
			printf("Invalid day\n");
		break;
	case 12:
		printf("December\n");
		if (date < 1 ||date > 31)
			printf("Invalid day\n");
		break;
	default:
		printf("You have entered an invalid month\n");
	    break;
	}
    
    if (year%400==0 || (year%4==0 && year%100!=0))
		
		printf("This is a leap year\n");
	
    else
		printf("This is not a leap year\n");
	
}