I'd like to make a calculator that has a TextBox control and for example if I write in 2+2-5/6
Then it should return the result in the same textbox replacing the calculation if I press the "=" button
My problem is that I can't get the input text to be considered as a mathematical calculation...
Please help!
Greatestevil,
The easiest way is to create an integer variable then perform the calculations with the variable and then display the results in the textbox.
The following code will show an example of this; you would place this into your "=" button.click event area...
Dim intCalc As IntegerNow to make it a little more simple you can have the intCalc variable equal your textbox.text. The only thing to watch out for here is that the textbox can contain strings and the intCalc would not be able hold anything other than a number. But there are many ways around this. The nice thing about programming is the ability to use your imagination to solve the problem or to "re-invent the wheel".
Welcome to programming; enjoy!
I hope the above helps!
Thank you,
James
Rea Software Engineering wrote:
Greatestevil,
The easiest way is to create an integer variable then perform the calculations with the variable and then display the results in the textbox.
The following code will show an example of this; you would place this into your "=" button.click event area...
Dim intCalc As Integer
intCalc = 2 + 2 - 5 / 6
TextBox1.Text = intCalcNow to make it a little more simple you can have the intCalc variable equal your textbox.text. The only thing to watch out for here is that the textbox can contain strings and the intCalc would not be able hold anything other than a number. But there are many ways around this. The nice thing about programming is the ability to use your imagination to solve the problem or to "re-invent the wheel".
Welcome to programming; enjoy!
I hope the above helps!
Thank you,
James
First I need to correct the suggestion from using an integer to using Double. The integer will only hold whole numbers. Such as your example should result in a 3.166667 and if you use an integer it will round down to show 3; the datatype "Double" will show the decimal places. See the MSDN documentation for more information on datatypes to best decide what suits you. The coding should look like this:
Dim dblCalc As DoubleAnother thing to point out is that VB performs mathematical equations in the logic of a mathematician; I believe this is called the logical order, or something like that...it's been way to long since I have dealt with math equations
The point being is that the example equation will equal 3.16667 because of the order of operations (multiply, divide, add, subtract); 5/6 is performed before 2+2 and then 5/6 is subtracted from 4 (result of 2+2).
If you want to bypass this you would do it the same way a mathematician would; by using parenthesis to determine the operation order. I.E. (2+2-5) / 6 = -0.166667.
I hope this additional information will help clear out some missed points and provide you with the right path to completing your project.
Good Luck!
Thank you,
James
