Visual Basic随机数范围选择器 [英] Visual basic random number range selector

问题描述

我想在我的项目中制作一个迷你游戏，你必须解决x的值，这是随机生成的，具体取决于用户选择的难度。虽然当我尝试这样做并通过说console.writeline（x）测试它时，它说
x由于它的保护级别而无法访问。 

I am trying to make a mini game in my project were you have to solve the value of x which is randomly generated depending on the difficulty that the user chooses. Although when i try to do this and test it out by saying console.writeline(x) it says that x is inaccessible due to it's protection level. 

        If userinput = "a" Then

            Dim x As Integer = Rnd.Next(1, 10)

        ElseIf userinput = "b" Then
            Dim x As Integer = Rnd.Next(1, 20)

        ElseIf userinput = "c" Then
            Dim x As Integer = Rnd.Next(1, 30)

        End If
        Console.Clear()
        Console.WriteLine("Try and guess x.")

        userinput = Console.ReadLine
        Console.WriteLine(x)

有没有人知道如何解决这个问题？

Does anybody know how to fix this?

推荐答案

这是因为'范围'需要事先声明x。

It's because of 'scoping' where x needs to be declared before hand.

Module Module1

    Sub Main()
        Dim userinput As String = ""
        Dim x As Integer
        Dim Rnd As Random = New Random()


        If userinput = "a" Then

            x = Rnd.Next(1, 10)

        ElseIf userinput = "b" Then
            x = Rnd.Next(1, 20)

        ElseIf userinput = "c" Then
            x = Rnd.Next(1, 30)

        End If
        Console.Clear()
        Console.WriteLine("Try and guess x.")

        userinput = Console.ReadLine
        Console.WriteLine(x)

    End Sub

End Module

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