Question

Write a program that reads a char as an input from the keyboard and outputs whether it is a valid character to start an identifier. (Hint: look for a method in for the Character class.) Please do this in java.

Answer 1

/*
 *  Java program to read a char as an input from the keyboard and outputs whether it is a valid character to start an identifier
*/

import java.util.Scanner; 

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

    System.out.print("Enter a character: ");
    char c = sc.next().charAt(0);

    if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c == '_'))
      System.out.println(c + " is a valid character");
    else
      System.out.println(c + " is not a valid character");

  }
}

/*  Program ends here */