Home » Ruby Tutorial » Ruby Programs

Ruby program to calculate the product of two given numbers using recursion

Last Updated : December 15, 2025

Problem Solution

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

Program/Source Code

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

# Ruby program to calculate the product 
# of two given numbers using recursion

def calculateProduct(a, b)
    if a < b
        return calculateProduct(b, a);
    elsif b != 0
        return (a + calculateProduct(a, b - 1));
    else
        return 0;
    end
end

print "Enter number1: ";
number1 = gets.chomp.to_i;  

print "Enter number2: ";
number2 = gets.chomp.to_i;  

result = calculateProduct(number1, number2);

print "Product is: ",result;

Output

Enter number1: 5
Enter number2: 3
Product is: 15

Explanation

In the above program, we read two integer numbers from the user. Then we calculated the product of input numbers using recursive function calculateProduct(). Then we printed the result.

Ruby User-defined Functions Programs »