Program.java

package com.peerapongme.labs.java101rxjava;

import java.util.Scanner;

/**
 * Created by peerapong on 8/22/16.
 */
public class Program {

    public static void main(String[] args) {
        System.out.println("Enter characters.....");
        Scanner scanner = new Scanner(System.in);
        if (scanner.hasNextLine()) {
            String str = scanner.nextLine();
            if (str.length() > 1) {
                System.out.println("Invalid");
            } else {
                char userChar = str.charAt(0);
                if (userChar >= 65 && userChar <= 90) {
                    System.out.println(userChar + ": " + (userChar - 64));
                } else if (userChar >= 91 && userChar <= 122) {
                    System.out.println(userChar + ": " + userChar);
                } else {
                    System.out.println("Invalid");
                }
            }
        }
    }
}