Example: Replace Zeros with Ones using Mathematical Operations in Java

// Replace Zeros with Ones using Mathematical Operations
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Step 1: Get integer input from the user
        System.out.print("Enter an integer: ");
        int originalNumber = scanner.nextInt();

        // Handle the special case of 0
        if (originalNumber == 0) {
            System.out.println("Original number: " + originalNumber);
            System.out.println("Modified number: 1"); // 0 becomes 1
            scanner.close();
            return;
        }

        int modifiedNumber = 0;
        int powerOfTen = 1; // Used to place digits in correct positions

        int tempNumber = originalNumber;

        // Step 2: Process the number digit by digit
        while (tempNumber > 0) {
            int digit = tempNumber % 10; // Get the last digit

            // Step 3: Replace 0 with 1 if found
            if (digit == 0) {
                digit = 1;
            }

            // Step 4: Reconstruct the modified number
            modifiedNumber = digit * powerOfTen + modifiedNumber;

            // Step 5: Move to the next digit and update power of ten
            tempNumber /= 10;
            powerOfTen *= 10;
        }

        // Step 6: Print the result
        System.out.println("Original number: " + originalNumber);
        System.out.println("Modified number: " + modifiedNumber);

        scanner.close();
    }
}