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+---
+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。