## Introduction

In this demo I have used NetBeans IDE 8.2 for debugging purpose. But you can use any java programming language compiler as per your availability..

import java.util.Scanner; public class JavaExcercise { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter any number: "); if (in.hasNextLong()) { long num = in.nextLong(); if (num < 0) { num *= -1; } { int digits = 1; if (num >= 10 && num < 100) { digits = 2; } else if (num >= 100 && num < 1000) { digits = 3; } else if (num >= 1000 && num < 10000) { digits = 4; } else if (num >= 10000 && num < 100000) { digits = 5; } else if (num >= 100000 && num < 1000000) { digits = 6; } else if (num >= 1000000 && num < 10000000) { digits = 7; } else if (num >= 10000000 && num < 100000000) { digits = 8; } else if (num >= 100000000 && num < 1000000000) { digits = 9; } else if (num >= 1000000000 && num < 10000000000L) { digits = 10; } System.out.println("Number of digits in the number: " + digits); } } else { System.out.println("The number is not an integer"); } } }