Question

WAP to input a positive number and check whether it a single, double, triple or ‘n’ digit number.​

Answer 1

import java.util.Scanner;  

public class NumberDigits {

   public static void main(String[ ] args) {

       // Accepting a number and converting it to String.

       System.out.print("Enter a number - ");

       // Using nextLong( ) to ensure that the user enters a Integer.

       String number = new Scanner(System.in).nextLong( ) + "";

       System.out.println("It's a " + number.length() + " digit number");

   }

}

Can be further modified with a switch statement,

   switch (number.length( )) {

       case 1:

            System.out.println("Single digit number");

       case 2:

            System.out.println("Double digit number");

       case 3:

            System.out.println("Triple digit number");

        ....

   }