Count Digits in Java: Explanation & Practice

Problem summary

Write a program that counts how many digits are in a given number. Your code should work for ANY positive integer.

Starter code

public class Main {
    public static void main(String[] args) {
        int number = 12345; // Test case 1
        
        // Write code to count digits
        // Should work for ANY positive number
        // Print: Digit count: <result>
    }
}

Expected output and test cases

• 12345 has 5 digits

  Digit count: 5

• 100 has 3 digits

  Digit count: 3

• 7 has 1 digit

  Digit count: 1

Hints

1. Keep dividing by 10 until the number becomes 0
2. Count how many divisions it takes
3. Handle the special case of 0 separately

Related Core Java Basics exercises

• Practice Sum of Digits in Java
• Practice Reverse a Number in Java
• Practice Calculate Power in Java

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