stupid question...

seymour_glass · #1 (**permalink**) April 30th, 2007, 03:18 PM

Ok, I am making a simple calculator. All I am looking for is a method which acts like a Console.ReadLine, so that I can enter a value twice into a textBox during the same Click Event...

i.e...
{
val1 = int.Parse(uiUserTextBox.Text)
(some method)
val2 = int.Parse(uiUserTextBox.Text)
}

Help??

Seymour

planoie · #2 (**permalink**) May 1st, 2007, 03:43 PM

What do you mean by "during the same click event"? If this is a winforms app, then you can't really do the equivalent of a console readline that waits for user input. You need to allow the user to input something, to an event (click button, press enter, etc) then enter another value and repeat the event to complete the operation.

-Peter

seymour_glass · #3 (**permalink**) May 1st, 2007, 09:17 PM

I knew that this might be a problem. I understand that I can't use a console readline being a windows app, however, I cannot seem to grasp this. If i have '3' in the TextBox and press plus, my current code is adding 3 to itself (because it is what gets parsed) and returning that value. Maybe if someone can view the code for my click_event it will help convey why I am still messing this up.

Code:

try
    {
          if(lngTotal == 0)
        {
        val2 = val1;
        val1 = long.Parse(uiAnswerTextBox.Text);
        uiAnswerTextBox.Clear();

        myMath ans = new myMath(); 
        lngTotal  = ans.Add(val1, val2); 
        uiAnswerTextBox.Text = (lngTotal.ToString());
        }
        else
            {
            val1 = lngTotal;
            val2 = long.Parse(uiAnswerTextBox.Text);

            myMath ans = new myMath(); 
            lngTotal  = ans.Add(val1, val2); 
            uiAnswerTextBox.Text = (lngTotal.ToString());
             }

            }
    catch
       {
          MessageBox.Show("Please input a number", 
               "Input Error", MessageBoxButtons.OK, 
           MessageBoxIcon.Hand);
        }
      }

I just need a direction because I dont see my problem....

Seymour

planoie · #4 (**permalink**) May 2nd, 2007, 06:40 AM

I can't see where lngTotal is getting assigned originally, so I'm not sure how the branching logic will be handled.

But generally, I think the problem is that you can't actually execute the "add" process when you press the "+" key. That isn't how it works on most calculators anyway. You should handle a sequence of key presses like this:
    3
    +
    3
[Enter]
You have to place the first value into a variable and capture the operation (+,-,*,/,etc.) to another variable. Then you can perform the desired operation (whether or not the user enters a different value).

-Peter

Need to download code?

Navigation