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Conditional Constructs in Java

Chapter 8

Conditional Constructs in Java

Class 10 - Logix Kips ICSE Computer Applications with BlueJ
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Java Program: Check Number of Digits

18. Create a program to find out if the number entered by the user is a two, three or four digits number.

Sample input: 1023
Sample output: 1023 is a 4 digit number.

Java 
import java.util.Scanner;


 


public class DigitCount {


    public static void main(String[] args) {


        Scanner sc = new Scanner(System.in);


 


        // Input number


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


        int num = sc.nextInt();


 


        // Remove sign if number is negative


        int n = Math.abs(num);


 


        // Check number of digits


        if (n >= 10 && n <= 99) {


            System.out.println(num + " is a 2 digit number.");


        } else if (n >= 100 && n <= 999) {


            System.out.println(num + " is a 3 digit number.");


        } else if (n >= 1000 && n <= 9999) {


            System.out.println(num + " is a 4 digit number.");


        } else {


            System.out.println(num + " is not a 2, 3, or 4 digit number.");


        }


 


        sc.close();


    }


}

Output

Sample Input 
Enter a number: 1023

Sample Output 
1023 is a 4 digit number.

Explanation

  • The program reads an integer using the Scanner class.
  • Math.abs() is used to handle negative numbers.
  • The number is checked against numeric ranges:
    • 10–99 → 2 digits
    • 100–999 → 3 digits
    • 1000–9999 → 4 digits
  • An appropriate message is displayed.
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