itf103.md-wk-11-wk-13.number02

package md.WK11toWK13;

import java.util.Scanner;

public class number02 {
    public static void main(String[] args) {
        Scanner ralph = new Scanner(System.in);

        System.out.print("Input a letter of the alphabet: ");

//        converts string input to lowercase for a more simple algorithm
        String input = ralph.next().toLowerCase();

        boolean uppercase = input.charAt(0) >= 65 && input.charAt(0) <= 90;
        boolean lowercase = input.charAt(0) >= 97 && input.charAt(0) <= 122;
        boolean vowels = input.equals("a") || input.equals("e") || input.equals("i") || input.equals("o") || input.equals("u");

//        prints "error" when string input length is longer than 1 character
        if (input.length() > 1) {
            System.out.println("Error! Please enter a single character!");

//        prints "error" when string input is not a lowercase or uppercase letter
        } else if (!(uppercase || lowercase)) {
            System.out.println("Error! Please enter a lowercase or uppercase letter");

//         prints "vowels" when string input is a vowel letter
        } else if (vowels) {
            System.out.println("You input a Vowel letter");

//         prints "consonants" when string input is a consonant letter
        } else {
            System.out.println("You input a Consonant letter");
        }
    }
}