Function Double reference parameter VB.Net Exercise - Visual Basic Programming Course

 Lesson

 Exercise

Function Double reference parameter

Objetive

Write a Visual Basic (VB.Net) 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

Code

Imports System
Public Class exercise105
    Public Shared Sub Double(ByRef n As Integer)
        n = n + n
    End Sub

    Public Shared Sub Main()
        Dim x As Integer = 2
        Double(x)
        Console.WriteLine(x)
    End Sub
End Class