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我的老师给我发了一封电子邮件，告诉我我的作业是写一段关于租车的代码：

Sub Main()
    Dim age, credit As Integer
    Dim name As String

    Console.WriteLine("This programme determines whether you can rent a car.")
    Console.WriteLine("Please enter your name...")
    name = Console.ReadLine

    Console.WriteLine(name & " how old are you?")
    age = Console.ReadLine

    Console.WriteLine("How much does your credit card currently hold? (£)")
    credit = Console.ReadLine

    If age < 18 Then
        Console.WriteLine("Sorry, " & name & " you are not old enough to rent a car, please use the bicycle hire company!")
    End If

    If age >= 18 And credit >= 5000 Then
        Console.WriteLine(name & " you are able to rent a car!")
    End If

    If age >= 18 And credit < 5000 Then
        Console.WriteLine("Sorry, " & name & " You are currently not able to rent a car.")
    End If

End Sub

这就是我要求你不要这样做的方式，就好像它一直在破坏控制结构然后又重新进入一样。你能用Else Ifs吗？

他所说的“它不断打破控制结构，然后又重新进入”是什么意思。

这是使用 ElseIf 的正确代码吗：

  Sub Main()
    Dim age, credit As Integer
    Dim name As String

    Console.WriteLine("This programme determines whether you can rent a car.")
    Console.WriteLine("Please enter your name...")
    name = Console.ReadLine

    Console.WriteLine(name & " how old are you?")
    age = Console.ReadLine

    Console.WriteLine("How much does your credit card currently hold? (£)")
    credit = Console.ReadLine()
    If age >= 18 And credit >= 5000 Then
        Console.WriteLine(name & " you are able to rent a car!")
    ElseIf age >= 18 And credit < 5000 Then
        Console.WriteLine("Sorry, " & name & " you are currently not able to rent a car.")
    ElseIf age < 18 Then
        Console.WriteLine("Sorry, " & name & " you are not old enough to rent a car, please use the bicycle hire company!")
    End If
End Sub
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1 回答 1

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不。虽然我不知道你的老师想教你什么（你真的应该问他，他是专业的教育工作者，并且得到报酬来做这项工作），我相信他的意思是：

If age < 18 Then
    Console.WriteLine("...")
ElseIf credit < 5000 Then
    Console.WriteLine("...")
Else 
    Console.WriteLine(name & " you are able to rent a car!")
End If

请注意此代码如何更易于维护。更改年龄或信用额度只需要编辑一个报表。这大大降低了出错的几率，也更容易阅读。

于 2013-10-13T15:03:46.193 回答