# Function Multiply & MultiplyR - Tutorial C# Sharp

## Lesson 5:

## Functions

## Exercise 5.40:

## Function Multiply & MultiplyR

## Objetive:

## Create two functions, Multiply and MultiplyR, to calculate the product of two numbers using sums. T he first version must be iterative, and the second one must be recursive.

## Source Code:

```
using System;
public class MultiplyRArgs
{
public static int MultiplyR(int n1, int n2)
{
if (n2 == 0)
return 0;
else
return n1 + MultiplyR(n1, n2 - 1);
}
public static int Main(string[] args)
{
if (args.Length != 2)
{
Console.WriteLine("Enter two numbers!!");
return 1;
}
else
{
int n1 = Convert.ToInt32(args[0]);
int n2 = Convert.ToInt32(args[1]);
Console.WriteLine(MultiplyR(n1, n2));
return 0;
}
}
}
```

Exercisey
5.40