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Imports System
 
Module Module1
	Const QUESTION_TYPE_ADDITION As Integer = 0
	Const QUESTION_TYPE_SUBTRACTION As Integer = 1
	Const QUESTION_TYPE_MULTIPLICATION As Integer = 2
	Const QUESTION_TYPE_DIVISION As Integer = 3
 
	Public Class Test
		Private Dim RandomGenerator As Random
		Private Dim Question As String
		Private Dim Answer As Integer
		Private Dim Score As Integer
 
		Private Sub GenerateQuestion()
			' Get the question type
			Dim QuestionType As Integer = RandomGenerator.Next(0, 3)
			Dim FirstNumber As Integer = RandomGenerator.Next(1, 100)
			Dim SecondNumber As Integer = RandomGenerator.Next(1, 100)
 
			Select Case QuestionType
				Case QUESTION_TYPE_ADDITION
					Question = FirstNumber & " + " & SecondNumber & " = ?"
					Answer = FirstNumber + SecondNumber
 
				Case QUESTION_TYPE_SUBTRACTION
 
				Case QUESTION_TYPE_MULTIPLICATION
 
				Case QUESTION_TYPE_DIVISION
 
				Case Else
					Console.WriteLine("Something went wrong. ;-;")
			End Select
		End Sub
 
		Private Sub AskQuestion()
			Console.Clear()
			Console.WriteLine(Question)
 
			Dim Entry As Integer = Console.Read()
			If Entry = Answer Then
				Console.WriteLine("Correct!")
				Score += 1
			Else
				Score -= 1
			End If
		End Sub
 
		Public Shared Sub Main()
			Dim index as Integer = 1
 
			While index <> 10
				GenerateQuestion()
				AskQuestion()
 
				index += 1
			End While
 
			Console.WriteLine("Your score is " & Score)
		End Sub
	End Class
End Module

Visual Basic.Net Compiler version 0.0.0.5943 (Mono 3.8 - tarball)
Copyright (C) 2004-2010 Rolf Bjarne Kvinge. All rights reserved.

/home/X08UdF/prog.vb (54,22) : error VBNC30369: Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.
/home/X08UdF/prog.vb (55,17) : error VBNC30369: Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.
/home/X08UdF/prog.vb (60,46) : error VBNC30369: Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.
There were 3 errors and 0 warnings.
Compilation took 00:00:00.9294670

Standard output is empty