**Proposed exercise**

**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**

**Solution**

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; } }