Can I save an operator in a variable?

BurnTard

I'm not quite sure if this should be in the asp.net, or possibly the c# forums...

I'm writing an asp.net calculator application in C#, and at this point it would be very useful if I could somehow save an operator in a variable, and then be able to use it later on, like this:

Let's say I have the integer session variables a=2 and b=4

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protected void button_add(object sender, EventArgs e)

{

operatorvar opx=+;}

protected void button_equals(object sender, EventArgs e)

{

int answer=a opx b;}

I also want the operator to be in a session variable.
Is this at all possible? I did some googling, but ended up coming back here.

insertAlias

What I'd do in that situation is write a method like this:

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 //i'm just doing this off the top of my head, haven't tested this code

private double PerformOperation(double a, char op, double b)

{

  double retVal = 0;

  switch(op)

  {

    case '+':

      retVal = a + b;

      break;

    case '-':

      retVal = a - b;

      break;

      .

      .

      .

    default:

      throw new Exception("Invalid Operator");

      break;

  }

  return retVal;

}

And just pass your operator to it as a character.

BurnTard

Oh I see, that's really clever! I've never learned about that type of functions, but I understant how it works. Thanks a lot for the fast response.

insertAlias

No prob. A few notes on the switch statements:
In most languages, if you don't "break" out after a case, the code will fall through and execute the next line. In C#, unless your case is empty, you will get an exception. So always remember to break; your cases.

Good

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 case 1:

  doSomething();

  doSomethingElse();

  break;

case 2:

  something();

  break;

Good (in this case, the code under 2 will be executed for either 1 or 2)

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 case 1:

case 2:

  something();

  break;

Bad

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 case 1:

  doSomething();

  //the missing break; will throw an exception

case 2:

  something();

  break;

Also, the "default" case will be used if none of the other cases are matched.

Can I save an operator in a variable?

re: Can I save an operator in a variable?

re: Can I save an operator in a variable?

re: Can I save an operator in a variable?

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