Double, reference parameters

Proposed exercise

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Create a function named "Double" to calculate the double of an integer number, and modify the data passed as an argument. It must be a "void" function and you must use "refererence parameters". For example. 

x = 5;

Double(ref x);

Console.Write(x);

would display 10

Output

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Solution

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using System;
public class F_DoubleRef
{
public static void Double(ref int n)
{   
n = n + n;
}

public static void Main()
{
int x = 2;

Double( ref x );
Console.WriteLine( x );
}
}