[SOLVED] Write in Visual basic language a program of a calculator, please?

#1 (**permalink**) 06-10-2007, 05:37 PM

That calculator has to do: addition, subtraction, multiplication and division. And it should have an icon to delete the former results and start again.
I really need it, and I will appreciate this a lot, thank you all.

ccoonen · #2 (**permalink**) 06-25-2007, 11:25 PM

I don't think anyone is going to just "write" this application for you but we would be willing to help you out

You would have a class with a private variable holding the Current Value (_CurrentValue). This _CurrentValue starts out with 0... then you can just encapsulate the already existing methods in VB to do addition, subtraction, etc...

HelloWorld · #3 (**permalink**) 06-26-2007, 08:22 AM

Quote:

Originally Posted by John W

That calculator has to do: addition, subtraction, multiplication and division. And it should have an icon to delete the former results and start again.
I really need it, and I will appreciate this a lot, thank you all.

What ccoonen said is right, you must post the problem and tried it yourself. I don't think there's someone that's going to all of the sudden with their happiness of coding will write you the program that you want, unless if you want to go to Freelance section of this forum

hmm...

siLenTz · #4 (**permalink**) 06-26-2007, 10:28 AM

This is my first post on this forum so I want to make it useful. I think this
is your assignment so you have to do it on your own. However, I can provide
you some hints to do it on your own.

Creating simple calculator like this is pretty easy. Follow these steps you will
able to complete that program in just a hour:

1) Creating a form, a textbox which is for input and output the result, 10
buttons of number from 0 to 9, and math operations buttons.

2) Creating 2 variables: first one is for store the first inputed number, and
the second one is operation variable which store what operation that
currently use.

Code:

Dim intVal    As Integer
Dim intOp    As Integer

3) Whenever you click on any operation button, the current value in
textbox will be store in intVal and then store the operation that you clicked
into intOp. intOp = 1 mean the addition operation is used if intOp = 2 mean
the subtraction operation is used, 3 for multipilcation and 4 for division.

The code probally look like this:

Code:

Private Sub bAddtion_Click()
     intOp = 1
     intVal = Text1.Text
     Text1.Text = ""
End Sub

Private Sub bSubtraction_Click()
     intOp = 2
     intVal = Text1.Text
     Text1.Text = ""
End Sub

.... so on.....

4) On the equal button, the program will calculate between those two
values.

Code:

Private Sub bEqual_Click()
     Select Case intOp
          Case 1:
               Text1.Text = intVal + CInt(Text1.Text)
          Case 2:
               Text1.Text = intVal - CInt(Text1.Text)
          Case 3:
               Text1.Text = intVal * CInt(Text1.Text)
          Case 4:
               Text1.Text = intVal \ CInt(Text1.Text)
     End Case

     intOp = 0

End Sub

5) But some users do not click on the equal button, they directly
click on other operations to continues calculate more number... Here the
solutio. Whenever the users click on each operations button, the program
will check if any operations is currently use. if there is then goto equal
button first.

On each operations button should be look like this

Code:

Private Sub bAddtion_Click()
     If intOp <> 0 Then bEqual_Click()

     intOp = 1
     intVal = Text1.Text
     Text1.Text = ""
End Sub

Private Sub bSubtraction_Click()
     If intOp <> 0 Then bEqual_Click()

      intOp = 2
      intVal = Text1.Text
      Text1.Text = ""
 End Sub

 .... so on.....

My english is very poor. Hope you are understand what I try to
explain. If anyone think is not the best way to do it or have any other way
please give comment

From siLenTz
My first lovely post!

HelloWorld · #5 (**permalink**) 06-26-2007, 10:59 AM

Although it's not my question, yeah it is damn useful! I love codes...

#6 (**permalink**) 09-06-2007, 08:37 PM

Quote:

Originally Posted by John W

That calculator has to do: addition, subtraction, multiplication and division. And it should have an icon to delete the former results and start again.
I really need it, and I will appreciate this a lot, thank you all.

I just uploaded a calculator to MSDN Forum: Show and Tell. It will take 72 hours to publish it (hopefully they will). It has all you want and a little more functions on it. Gladly give you the code if you like the calculator.
I am just a beginner like yourself.
I took a fancy on calculators - ( right now I am trying to finish imitating the MoffSoft Calculator's core ). I will post it also, when and if I am able to finish it).
There is an other Calculator ( the new era one) called Practicalc. This is something awesome for a calculator. Check it out. I got some of the screen functions coded.

On the other hand, I see on this Forum programmers that can do a calculator probably in hours. I would be glad hear for them, because I certainly need some direction with PractiCalc.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

The Following User Says Thank You to siLenTz For This Useful Post:
HelloWorld (06-26-2007)