vb.net 程序的WriteLine不显示
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WriteLine of program not displaying
提问by Matt
I am trying to create a program that takes the input of three numbers, averages them, and prints the average. The code I have so far:
我正在尝试创建一个程序，该程序输入三个数字，对它们求平均值，然后打印平均值。我到目前为止的代码：
Sub Main()
Dim Average As Double
Console.WriteLine("Please input first number:")
Dim Num1 As String
Num1 = Console.ReadLine()
Console.WriteLine("Please input second number:")
Dim Num2 As String
Num1 = Console.ReadLine()
Console.WriteLine("Please input third number:")
Dim Num3 As String
Num3 = Console.ReadLine()
Average = (Num1 + Num2 + Num3) / 3
Console.WriteLine("Your average is: ", Average)
Console.WriteLine("Press any key to exit")
Console.ReadLine()
End Sub
I enter three numbers, and then my program displays the text, "Your average is" But there's no value there; it's just blank after the text.
我输入三个数字，然后我的程序显示文本，“你的平均值是”但是那里没有值；文本后只是空白。
回答by Steve
Try with string concatenation
尝试使用字符串连接
Console.WriteLine("Your average is: " + Average.ToString)
Or using a composite format string
或者使用复合格式字符串
Console.WriteLine("Your average is: {0}", Average)
See MSDN on Console.WriteLine(string, object[])
请参阅 Console.WriteLine(string, object[]) 上的 MSDN
EDIT:You need to convert that string input in a correct number before attempting to execute an addition and a division on them
编辑：在尝试对它们执行加法和除法之前，您需要将该字符串输入转换为正确的数字
Dim Num1 as Integer
While(Int32.TryParse(Console.ReadLine(), Num1)
Console.WriteLine("Please enter a integer number")
' and so on for the other inputs '
And, please, do a favor to yourself and set Option Strict Onfor your projects. These kind of automatic conversions are evil.
而且，请帮个忙，Option Strict On为你的项目做好准备。这种自动转换是邪恶的。
回答by Neolisk
I think by this:
我认为：
Console.WriteLine("Your average is: ", Average)
You actually meant this:
你的意思是这样的：
Console.WriteLine(String.Format("Your average is: {0}", Average))
回答by Maynard Tismo Umali
Console.WriteLine("Please input first number:")
Dim Num1 As String
Num1 = Console.ReadLine()
Console.WriteLine("Please input second number:")
Dim Num2 As String
Num1 = Console.ReadLine() ------ Use Num2 instead of Num1
Console.WriteLine("Please input third number:")
Dim Num3 As String
Num3 = Console.ReadLine()
Average = (Num1 + Num2 + Num3) / 3
Console.WriteLine("Your average is: ", Average) and use concat "&" here.
Console.WriteLine("Press any key to exit")
Console.ReadLine()
