Function Multiply & MultiplyR

Proposed exercise

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

Output

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Solution

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using System;
public class Multiply
{
public static int Mul( int n1, int n2)
{
if (n2 == 0)
return 0;
else
return n1 + Mul( n1, n2 - 1 );
}   

public static int Main( )
{
if (args.Length != 2)
{
Console.WriteLine("Error arguments!!");
return 1;
}

int n1 = Convert.ToInt32( args[0] );       
int n2 = Convert.ToInt32( args[1] );       

Console.WriteLine( Mul( n1, n2 ) );
return 0;  
}
}