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Rust program to calculate the product of two numbers using recursion

Rust | Calculating Power using Recursion: Given two numbers, we have to calculate the product of two numbers using recursion.
Submitted by Nidhi, on October 12, 2021

Problem Solution:

In this program, we will create a recursive function to calculate the product of two integer numbers and return the result to the calling function.

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.

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

fn calculateProduct(a:i32, b:i32)->i32
{
    if a < b
    {
        return calculateProduct(b, a);
    }
    else if b != 0
    {
        return (a + calculateProduct(a, b - 1));
    }
    else
    {
        return 0;
    }
}

fn main() {
    let a:i32=6;
    let b:i32=8;
        
    let res = calculateProduct(a, b);
    println!("The product of {0} and {1} is {2}.", a, b, res);
}

Output:

The product of 6 and 8 is 48.

Explanation:

In the above program, we created two functions calculateProduct() and main(). The calculateProduct() function is a recursive function, which is used to calculate the product of two integer numbers and return the result to the calling function.

In the main() function, we called the calculateProduct() function and printed the result.

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