# Java Program to Multiply Two Numbers Using Recursion

In this article we are going to see how we can multiply two numbers using recursion by Java programming language.

## Java Program to Multiply Two Numbers Using Recursion

Multiplying two numbers means finding the product of two numbers.

Let’s see the program how we you multiply two numbers using recursion.

### Method-1:  Java Program to Multiply Two Numbers Using Recursion By Using Static Input Value

Approach:

• Store two numbers in two variables.
• Call the user defined method mulProd( ) to find the product and store it. The method prod() ensures that num1>num2 else swaps them. Then when num2 is greater than zero it calls mulProd( ) on num1 and decremented num2 then adds the result with num1.
• Print the result.

Program:

import java.util.*;
// Main class
public class Main
{
// Recursive method to multiply two numbers
public static int mulProd(int num1, int num2)
{
// If num2 is greater than num1 swap them and call the function
if (num1 < num2)
{
return mulProd(num2, num1);
}
// If num2 is greater than 0 then call the function by decrementing num2 by 1 and add the current num1 value to the result.
else if (num2 != 0)
{
return (num1 + mulProd(num1, num2 - 1));
}
else
{
return 0;
}
}

public static void main(String[] args)
{
int num1 = 29, num2 = 10;
// Call the method and store the result
int prod = mulProd(num1,num2);
// Print the result
System.out.println("The product of "+num1+" and "+num2+" is "+prod);
}
}


Output:

The product of 29 and 10 is 290

### Method-2: Java Program to Multiply Two Numbers Using Recursion By Using User Input Value

Approach:

• Ask the user to enter two numbers in order.
• Store two numbers in two variables.
• Call the user defined method mulProd( ) to find the product and store it. The method prod() ensures that num1>num2 else swaps them. Then when num2 is greater than zero it calls mulProd( ) on num1 and decremented num2 then adds the result with num1.
• Print the result.

Program:

import java.util.*;
// Main class
public class Main
{
// Recursive method to multiply two numbers
public static int mulProd(int num1, int num2)
{
// If num2 is greater than num1 swap them and call the function
if (num1 < num2)
{
return mulProd(num2, num1);
}
// If num2 is greater than 0 then call the function by decrementing num2 by 1 and add the current num1 value to the result.
else if (num2 != 0)
{
return (num1 + mulProd(num1, num2 - 1));
}
else
{
return 0;
}
}

public static void main(String[] args)
{
// Taking user input
Scanner sc = new Scanner(System.in);
// Ask the user to enter two numbers
System.out.print("Enter two numbers to multiply ");
int num1 = sc.nextInt(), num2 = sc.nextInt();
// Call the method and store the result
int prod = mulProd(num1,num2);
// Print the result
System.out.println("The product of "+num1+" and "+num2+" is "+prod);
}
}

Output:

Enter two numbers to multiply 15 50
The product of 15 and 50 is 750

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