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Java Program to Count Number of Digits in an Integer

A Java program to count the number of digits in an integer.

Problem Description

Write a Java program to count the number of digits in an integer entered by the user.

Code

CountDigits.java
public class CountDigits {
    public static void main(String[] args) {
        int count = 0, num = 3452;

        while (num != 0) {
            // num = num/10
            num /= 10;
            ++count;
        }

        System.out.println("Number of digits: " + count);
    }
}

Output

Number of digits: 4

Explanation

  1. Loop: Runs while num is not 0.
  2. Division: Divides num by 10 in each iteration to remove the last digit.
  3. Counter: Increments count in each iteration.

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