Using Variable as symbols vb.net

Question

I am writing a very simple math game. What I would like to be able to do is this:

Dim symbol as String

Private Sub Math()
    symbol = "+"
    1 symbol 1 = 2

    symbol = "-"
    1 symbol 1 = 0
end sub

I know this won't work, but it is the idea I want, thanks in advance.

wait.... 1-1=1? anyway, I think you should clarify what you want to do with this; it might be that a Func<int,int,int> suffices; i.e. Func<int,int,int> op = (x,y)=>x+y; var sum = op(2,3); // 5 (obviously this is C#, but can be translated to VB) — Marc Gravell
– Marc Gravell, Commented Aug 25, 2011 at 8:50
possible duplicate of Doing math in vb.net like Eval in javascript — user447356
– user447356, Commented Aug 25, 2011 at 8:57

Olivier Jacot-Descombes · Accepted Answer · 2011-08-25 15:04:09Z

1

As Marc Gravell already mentioned, you could use a lambda expression. This is how it works in VB:

Private Sub Calculate(f As Func(Of Double, Double, Double))
    Dim a As Double = 1.5, b As Double = 3.14
    Console.WriteLine(f(a,b));
End Sub

Then you would call Calculate like this:

Calculate(Function(x,y) x+y)
Calculate(Function(x,y) x-y)
Calculate(Function(x,y) x*y)

answered Aug 25, 2011 at 15:04

Olivier Jacot-Descombes

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Comments

Adithya Surampudi · Accepted Answer · 2011-08-25 08:50:17Z

1

Go with if else or switch case, use actual symbols inside the condition, something like

if symbol == "+":
return a+b;

if symbol == "-":
return a-b;

answered Aug 25, 2011 at 8:50

Adithya Surampudi

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2 Comments

Kuzon Over a year ago

Yes, thankyou. I understand this way. But I have to do it in at little as possible amount of code. Is there a shorter way to do it?

Adithya Surampudi Over a year ago

There is no generic way to map a mathematical symbol string to what it depicts. To make it shorter for your case, you can use ternary operator like Dim result as Integer = If(symbol="+", a+b, a-b)

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