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Java program to calculate the product of two numbers using recursion

Given two numbers, we have to calculate the product of them using the recursion.
Submitted by Nidhi, on June 02, 2022

Problem Solution:

In this program, we will read two integer numbers from the user and then we will calculate the product of given numbers using recursion.

Program/Source Code:

The source code to calculate the product of two numbers using recursion is given below. The given program is compiled and executed successfully.

// Java program to calculate the product of two numbers 
// using the recursion

import java.util.*;

public class Main {
  public static int calculateProduct(int num1, int num2) {
    if (num1 < num2)
      return calculateProduct(num2, num1);
    else if (num2 != 0)
      return (num1 + calculateProduct(num1, num2 - 1));
    return 0;
  }

  public static void main(String[] args) {
    Scanner X = new Scanner(System.in);

    int num1 = 0;
    int num2 = 0;
    int res = 0;

    System.out.printf("Enter number1: ");
    num1 = X.nextInt();

    System.out.printf("Enter number2: ");
    num2 = X.nextInt();

    res = calculateProduct(num1, num2);
    System.out.printf("Product is: " + res);
  }
}

Output:

Enter number1: 12
Enter number2: 13
Product is: 156

Explanation:

In the above program, we imported the "java.util.*" package to use the Scanner class. Here, we created a public class Main. The Main class contains two static methods calculateProduct(), main(). The calculateProduct() is a recursive method that finds the product of two numbers and returns the result to the calling method.

The main() method is the entry point for the program. Here, we read two integer numbers from the user and called the calculateProduct() method to calculate the product of input numbers and printed the result.

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