# C# Program to Find Product of Two Numbers using Recursion

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This is a C# Program to find Product of 2 numbers using recursion.

Problem Description

This C# Program finds Product of 2 Numbers using Recursion.

Problem Solution

Here the multiples of 3 and 5 are found and the sum of all the multiples are calculated and are displayed.

Program/Source Code

Here is source code of the C# Program to find Product of 2 Numbers using Recursion. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

```/*
* C# Program to find Product of 2 Numbers using Recursion
*/
using System;
class program
{
public static void Main()
{
int a, b, result;
Console.WriteLine("Enter two numbers to find their product: ");
prog pg = new prog();
result = pg.product(a, b);
Console.WriteLine("Product of {0} and {1} is {2}",a, b, result);
}
}
class prog
{
public int product(int a, int b)
{
if (a < b)
{
return product(b, a);
}
else if (b != 0)
{
return (a + product(a, b - 1));
}
else
{
return 0;
}
}
}```
Program Explanation

In this C# program, we are reading two numbers using ‘a’ and ‘b’ variables respectively. Using ‘result’ variable we are calling product() function by passing the value of ‘a’ and ‘b’ variables as an argument.

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Then product() function is used to find the multiples of 3 & 5 and the sum of all the multiples are calculated and are printed.

Runtime Test Cases
```
Enter two numbers to find their product:
5
6
Product of 5 and 6 is 30```

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