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| diff --git a/zh-cn/visualbasic-cn.html.markdown b/zh-cn/visualbasic-cn.html.markdown new file mode 100644 index 00000000..4459a2cd --- /dev/null +++ b/zh-cn/visualbasic-cn.html.markdown @@ -0,0 +1,272 @@ +--- +language: Visual Basic +contributors: +    - ["Brian Martin", "http://brianmartin.biz"] +translators: +    - ["Abner Chou", "http://github.com/NoahDragon"] +lang: zh-cn +filename: learnvisualbasic.vb-cn +--- + +```vb +Module Module1 + +    Sub Main() +        ' 让我们先从简单的终端程序学起。 +        ' 单引号用来生成注释(注意是半角单引号,非全角单引好’) +        ' 为了方便运行此示例代码,我写了个目录索引。 +        ' 可能你还不了解以下代码的意义,但随着教程的深入,你会 +        ' 渐渐理解其用法。 +        Console.Title = ("Learn X in Y Minutes") +        Console.WriteLine("NAVIGATION") ' 显示目录 +        Console.WriteLine("") +        Console.ForegroundColor = ConsoleColor.Green +        Console.WriteLine("1. Hello World Output") ' Hello world 输出示例 +        Console.WriteLine("2. Hello World Input") ' Hello world 输入示例 +        Console.WriteLine("3. Calculating Whole Numbers") ' 求整数之和 +        Console.WriteLine("4. Calculating Decimal Numbers") ' 求小数之和 +        Console.WriteLine("5. Working Calculator") ' 计算器 +        Console.WriteLine("6. Using Do While Loops") ' 使用 do while 循环 +        Console.WriteLine("7. Using For While Loops") ' 使用 for while 循环 +        Console.WriteLine("8. Conditional Statements") ' 条件语句 +        Console.WriteLine("9. Select A Drink") ' 买饮料 +        Console.WriteLine("50. About") ' 关于 +        Console.WriteLine("Please Choose A Number From The Above List") +        Dim selection As String = Console.ReadLine +        Select Case selection +            Case "1" ' Hello world 输出示例 +                Console.Clear() ' 清空屏幕 +                HelloWorldOutput() ' 调用程序块 +            Case "2" ' Hello world 输入示例 +                Console.Clear() +                HelloWorldInput() +            Case "3" ' 求整数之和 +                Console.Clear() +                CalculatingWholeNumbers() +            Case "4" ' 求小数之和 +                Console.Clear() +                CalculatingDecimalNumbers() +            Case "5" ' 计算器 +                Console.Clear() +                WorkingCalculator() +            Case "6" ' 使用 do while 循环 +                Console.Clear() +                UsingDoWhileLoops() +            Case "7" ' 使用 for while 循环 +                Console.Clear() +                UsingForLoops() +            Case "8" ' 条件语句 +                Console.Clear() +                ConditionalStatement() +            Case "9" ' If/Else 条件语句 +                Console.Clear() +                IfElseStatement() ' 选饮料 +            Case "50" ' 关于 +                Console.Clear() +                Console.Title = ("Learn X in Y Minutes :: About") +                MsgBox("This tutorial is by Brian Martin (@BrianMartinn") +                Console.Clear() +                Main() +                Console.ReadLine() + +        End Select +    End Sub + +    ' 一、对应程序目录1,下同 + +    ' 使用 private subs 声明函数。  +    Private Sub HelloWorldOutput() +        ' 程序名 +        Console.Title = "Hello World Ouput | Learn X in Y Minutes" +        ' 使用 Console.Write("") 或者 Console.WriteLine("") 来输出文本到屏幕上 +        ' 对应的 Console.Read() 或 Console.Readline() 用来读取键盘输入 +        Console.WriteLine("Hello World") +        Console.ReadLine() +    End Sub + +    ' 二 +    Private Sub HelloWorldInput() +        Console.Title = "Hello World YourName | Learn X in Y Minutes" +        ' 变量 +        ' 用来存储用户输入的数据 +        ' 变量声明以 Dim 开始,结尾为 As VariableType (变量类型). + +        ' 此教程中,我们希望知道你的姓名,并让程序记录并输出。 +        Dim username As String +        ' 我们使用字符串类型(String)来记录文本信息。 +        Console.WriteLine("Hello, What is your name? ") ' 询问用户输入姓名 +        username = Console.ReadLine() 'Stores the users name. +        Console.WriteLine("Hello " + username) ' 输出将是 Hello '姓名' +        Console.ReadLine() 'Outsputs the above. +        ' 以上程序将询问你的姓名,并和你打招呼。 +        ' 其它变量如整型(Integer)我们用整型来处理整数。 +    End Sub + +    ' 三 +    Private Sub CalculatingWholeNumbers() +        Console.Title = "Calculating Whole Numbers | Learn X in Y Minutes" +        Console.Write("First number: ") ' 输入一个整数:1,2,50,104,等等 +        Dim a As Integer = Console.ReadLine() +        Console.Write("Second number: ") ' 输入第二个整数 +        Dim b As Integer = Console.ReadLine() +        Dim c As Integer = a + b +        Console.WriteLine(c) +        Console.ReadLine() +        ' 以上程序将两个整数相加 +    End Sub + +    ' 四 +    Private Sub CalculatingDecimalNumbers() +        Console.Title = "Calculating with Double | Learn X in Y Minutes" +        ' 当然,我们还需要能够处理小数。 +        ' 只需要要将整型(Integer)改为小数(Double)类型即可。 + +        ' 输入一个小数: 1.2, 2.4, 50.1, 104.9,等等 +        Console.Write("First number: ") +        Dim a As Double = Console.ReadLine +        Console.Write("Second number: ") ' 输入第二个数 +        Dim b As Double = Console.ReadLine +        Dim c As Double = a + b +        Console.WriteLine(c) +        Console.ReadLine() +        ' 以上代码能实现两个小数相加 +    End Sub + +    ' 五 +    Private Sub WorkingCalculator() +        Console.Title = "The Working Calculator| Learn X in Y Minutes" +        ' 但是如果你希望有个能够处理加减乘除的计算器呢? +        ' 只需将上面代码复制粘帖即可。 +        Console.Write("First number: ") ' 输入第一个数 +        Dim a As Double = Console.ReadLine +        Console.Write("Second number: ") ' 输入第二个数 +        Dim b As Integer = Console.ReadLine +        Dim c As Integer = a + b +        Dim d As Integer = a * b +        Dim e As Integer = a - b +        Dim f As Integer = a / b + +        ' 通过以下代码我们可以将以上所算的加减乘除结果输出到屏幕上。 +        Console.Write(a.ToString() + " + " + b.ToString()) +        ' 我们希望答案开头能有3个空格,可以使用String.PadLeft(3)方法。 +        Console.WriteLine(" = " + c.ToString.PadLeft(3)) +        Console.Write(a.ToString() + " * " + b.ToString()) +        Console.WriteLine(" = " + d.ToString.PadLeft(3)) +        Console.Write(a.ToString() + " - " + b.ToString()) +        Console.WriteLine(" = " + e.ToString.PadLeft(3)) +        Console.Write(a.ToString() + " / " + b.ToString()) +        Console.WriteLine(" = " + e.ToString.PadLeft(3)) +        Console.ReadLine() + +    End Sub + +    ' 六 +    Private Sub UsingDoWhileLoops() +        ' 如同以上的代码一样 +        ' 这次我们将询问用户是否继续 (Yes or No?) +        ' 我们将使用Do While循环,因为我们不知到用户是否需要使用一次以上。 +        Console.Title = "UsingDoWhileLoops | Learn X in Y Minutes" +        Dim answer As String 'We use the variable "String" as the answer is text +        Do ' 循环开始 +            Console.Write("First number: ") +            Dim a As Double = Console.ReadLine +            Console.Write("Second number: ") +            Dim b As Integer = Console.ReadLine +            Dim c As Integer = a + b +            Dim d As Integer = a * b +            Dim e As Integer = a - b +            Dim f As Integer = a / b + +            Console.Write(a.ToString() + " + " + b.ToString()) +            Console.WriteLine(" = " + c.ToString.PadLeft(3)) +            Console.Write(a.ToString() + " * " + b.ToString()) +            Console.WriteLine(" = " + d.ToString.PadLeft(3)) +            Console.Write(a.ToString() + " - " + b.ToString()) +            Console.WriteLine(" = " + e.ToString.PadLeft(3)) +            Console.Write(a.ToString() + " / " + b.ToString()) +            Console.WriteLine(" = " + e.ToString.PadLeft(3)) +            Console.ReadLine() +            ' 询问用户是否继续,注意大小写。  +            Console.Write("Would you like to continue? (yes / no)") +            ' 程序读入用户输入 +            answer = Console.ReadLine() ' added a bracket here +        ' 当用户输入"yes"时,程序将跳转到Do,并再次执行 +        Loop While answer = "yes" + +    End Sub + +    ' 七 +    Private Sub UsingForLoops() +        ' 有一些程序只需要运行一次。 +        ' 这个程序我们将实现从10倒数计数. + +        Console.Title = "Using For Loops | Learn X in Y Minutes" +        ' 声明变量和步长(即递减的速度,如-1,-2,-3等)。  +        For i As Integer = 10 To 0 Step -1  +            Console.WriteLine(i.ToString) ' 将计数结果输出的屏幕 +        Next i ' 计算新的i值 +        Console.WriteLine("Start")  +        Console.ReadLine()  +    End Sub + +    ' 八 +    Private Sub ConditionalStatement() +        Console.Title = "Conditional Statements | Learn X in Y Minutes" +        Dim userName As String = Console.ReadLine +        Console.WriteLine("Hello, What is your name? ") ' 询问用户姓名 +        userName = Console.ReadLine() ' 存储用户姓名 +        If userName = "Adam" Then +            Console.WriteLine("Hello Adam") +            Console.WriteLine("Thanks for creating this useful site") +            Console.ReadLine() +        Else +            Console.WriteLine("Hello " + userName) +            Console.WriteLine("Have you checked out www.learnxinyminutes.com") +            Console.ReadLine() ' 程序停止,并输出以上文本 +        End If +    End Sub + +    ' 九 +    Private Sub IfElseStatement() +    Console.Title = "If / Else Statement | Learn X in Y Minutes" +        ' 有时候我们需要考虑多于两种情况。 +        ' 这时我们就需要使用If条件语句。 +        ' If语句就好似个自动售货机,当用户输入A1,A2,A3,等去选择物品时, +        ' 所有的选择可以合并到一个If语句中 + +        Dim selection As String = Console.ReadLine 'Value for selection +            Console.WriteLine("A1. for 7Up") ' A1 七喜 +            Console.WriteLine("A2. for Fanta") ' A2 芬达 +            Console.WriteLine("A3. for Dr. Pepper") ' A3 胡椒医生 +            Console.WriteLine("A4. for Diet Coke") ' A4 无糖可乐 +            Console.ReadLine() +            If selection = "A1" Then +                Console.WriteLine("7up") +                Console.ReadLine() +            ElseIf selection = "A2" Then +                Console.WriteLine("fanta") +                Console.ReadLine() +            ElseIf selection = "A3" Then +                Console.WriteLine("dr. pepper") +                Console.ReadLine() +            ElseIf selection = "A4" Then +                Console.WriteLine("diet coke") +                Console.ReadLine() +            Else +                Console.WriteLine("Please select a product") ' 请选择你需要的产品 +                Console.ReadLine() +            End If + +    End Sub + +End Module + +``` + +## 参考 + +我(译注:原作者)在命令行下学习的VB。命令行编程使我能够更好的了解程序编译运行机制,并使学习其它语言变得容易。  + +如果希望进一步学习VB,这里还有更深层次的 <a href="http://www.vbbootcamp.co.uk/" Title="VB教学">VB教学(英文)</a>。  + +所有代码均通过测试。只需复制粘帖到Visual Basic中,并按F5运行即可。  | 
