Java Program To Find Number Of Days In A Month

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import java.util.Scanner;

public class DaysInMonth {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter year: ");
        int year = scanner.nextInt();

        System.out.print("Enter month (1-12): ");
        int month = scanner.nextInt();

        int numberOfDays = getNumberOfDays(year, month);
        
        if (numberOfDays == -1) {
            System.out.println("Invalid month input.");
        } else {
            System.out.println("Number of days in the selected month: " + numberOfDays);
        }

        scanner.close();
    }

    public static int getNumberOfDays(int year, int month) {
        if (month < 1 || month > 12) {
            return -1; // Invalid month input
        }

        int[] daysInMonth = {
            31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
        };

        // Adjust for leap year
        if (month == 2 && isLeapYear(year)) {
            return 29;
        }

        return daysInMonth[month - 1];
    }

    public static boolean isLeapYear(int year) {
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
    }
}

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