Practice Exercises Java - Learn to program performing exercises with Java

Practice Exercises Java

Learn to program performing exercises with Java

12 Lessons Java with the Solutions - 228 Exercises Java with the solutions
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Digits in a number - Practice Exercises Java

Lesson 2:

Flow Control

Exercise 2.24:

Digits in a number


Create a program to calculate how many digits has a positive integer (hint: it can be done by dividing by 10 several times). If the user enters a negative integer, the program must show a warning message, and proceed with the equivalent positive number.

For example:
Number = 32
2 digits
Number = -4000
(Warning: it is a negative number) 4 digits

Source Code:

import java.util.*;
public class Main
	public static void main(String[] args)
		int number;
		int digit = 0;

		System.out.print("Number? ");
		number = Integer.parseInt(new Scanner(;

		if (number < 0)
			System.out.println("(Warning: it is a negative number)");
			number = -number;

		while (number > 0)
			number = number / 10;

		if (digit == 0)
			digit = 1;

		System.out.printf( digit + " digits" + "\r\n");
Exercisey 2.24

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