Question

Please help me in writing a Program that takes a single digit or value from user and then prints whether the value is an Alphabet or a number or a special character. And if the input is alphabet then determines whether its vowel or not. I don’t Know how to use the Builtin Java functions coz am new to java. Below is the code.

import java.util.Scanner;
public class myClass {

  public static void main(String[] args){


    Scanner input=new Scanner(System.in);

    System.out.println("Enter The Value To Check: ");

    int N=input.nextInt();
    for(int i=0; i<=9; i++){

    if(N==i) {

        System.out.println("You Entered A Number");
        break;
     }

    }

    if(N=='a'||N=='A' ||N=='z'   ||N=='Z') {

      System.out.println("You Entered An Alphabet");

    }


    for(int k=128; k<=255; k++){

        if (N==k){

        System.out.println("You Enter A Special Character");

        }

    }
  }
}

Answer 1

You seem to be confusing ASCII with ASCII encoded decimals… nextInt() returns next integer, which won’t work if you enter say ?, &, * etc. Use the hasNext() method to check what’s available first

if (input.hasNextInt()) {
  System.out.println("You Entered A Number " + input.nextInt());
} else if (input.hasNext("\\w")) {
  System.out.println("You Entered An Alphabet " + input.next());
} else {
  System.out.println("You Enter A Special Character");
}