CODEWITHSUNDEEP
vb.netloopsconsole
Matt
Matt

Reputation: 191

VB.NET Have whole program loop until user decides to exit?

I have a simple program to average ten (user-defined) numbers and then print the result. At the end of the program I'd like to print Would you like to average a new set of numbers? (Y/N) If the user inputs y than I want the program to execute again from the top. If the user inputs n than the program should close. I've tried researching this, but only found ways to have the entire console exit and re-open which is not what I want.

Upvotes: 0

Views: 3949

Answers (2)

Ricardo Virtudazo Jr
Ricardo Virtudazo Jr

Reputation: 351

My response may be a little late in the game, but thought I'd share a compact version implementing a try-catch method.

Sub Main()
    Do
        Try
            Console.Write("Enter a value: ")
            Console.ReadLine()
            '...

            SomeProcedure()

        Catch ex As Exception
            Console.WriteLine(ex.ToString)
        Finally
            Console.Write("Enter another value? (N for No) ")
        End Try

    Loop Until Console.ReadLine() = "N"

End Sub

Sub SomeProcedure()
    '...
End Sub

Upvotes: 0

JDB
JDB

Reputation: 25810

To detect what the user has entered you have a couple options:

Console.ReadKey()

will read the next keystroke. You can then use a simple Select Case branch to choose what to do.

You can also use:

Console.ReadLine()

which will return a string (after the user presses enter). You can then use a simple If statement to determine what's in the string (and repeat the query if something other than "y" or "n" was entered.)

Example:

Shared Sub Main()    
    While True
        AverageNums()
        Console.WriteLine( "Do you want to run again? (Y/N)" )
        Dim key = Console.ReadKey()
        If key.Key = ConsoleKey.N Then
            Exit While
        End If
    End While    
End Sub

Shared Sub AverageNums()
    ' ...
End Sub

Upvotes: 2

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