Question

This one’s really got me confused. I’m trying to do a visual basic console application that if the user enters ‘A’ or ‘a’ then the program should do ‘x’, but that’s not working. The error I get is:

Conversion from string "a" to type ‘Boolean’ is not valid.

Here’s my code:

Module Module1

Sub Main()
    Dim Selection As String

    Console.WriteLine("Please select your function:")
    Console.WriteLine("* To convert binary to decimal, press A,")
    Console.WriteLine("* Or to convert decimal to binary, press B")

    Selection = Console.ReadLine

    If Selection = "A" Or "a" Then
        Console.WriteLine("This will be A")
    ElseIf Selection = "B" Or "b" Then
        Console.WriteLine("This will be B")
    ElseIf Selection = Not "A" Or "a" Or "B" Or "b" Then
        Console.WriteLine("Please try again")
        Do Until Selection = "A" Or "a" Or "B" Or "b"
        Loop
    End If


End Sub

What should be the correct usage of the Or in this piece of code to make it function correctly?

Answer 1

Your If clauses should be like:

If Selection = "A" Or Selection = "a" Then

The clauses between the Or should each be boolean expressions, and "a" is simply a character, not a boolean expression.