A small program

Hi to all in this forum,
I just started here and i'm little confused with to many articles!
I don't know where i can Post my question so if i made a mistake please move my Post to other topic. :)

my question :
I have some maths to do with three numbers : a*0.15 + b*0.5 + c*0.3 = ??
how i can make one program with Visual Studio Express 2012 where the three numbers (0.15 , 0.5 and 0.3) will be at the background and the user (me) to enter the three numbers (a,b,c) so that gives me result ??
the program maybe look like this and i need to press from keyboard only the three number a, b, c

I'm not a programmer please don't be lough about this :)

Thanks in advance

Attachment 95921

You mention you are using Visual Studios 2012 but which language VB or C#?

i need to use Visual Basic as a language for that program

Moved from General Discussion / Chit Chat

So A B & C would be textboxes ... and the other numbers & symbols would be labels... just add as many as you need and place them accordingly.

-tg

You actually drew out the design fairly well. The rectangles may all be textboxes. The + and = signs would have to be in labels. You may also want a, b, and c to be labels, as well. Generally, a textbox is a place where a user can type something, but for a, b, and c, you don't really want the user to be able to type anything, right? If they are not allowed to edit the numbers in those boxes, then you should use labels rather than textboxes. In either case, fiddle around with the font, backcolor, forecolor, appearance, and borders to make them look the way you want.

Behind the scenes, you'd want three variables (possibly called a, b, and c) of type Double. Those would hold the values. Thus you might write:

Dim a As Double = 0.15
Dim b As Double = 0.5
Dim c As Double = 0.3

you would show these variables in the textboxes/labels with something like this:

<your control name here>.Text = a.ToString
<your next control name here>.Text = b.ToString
<your next control name here>.Text = c.ToString

What happens after that isn't so clear, though, as I'm not sure what step you would want the user to take next. Do they enter a value for the total and press a button?

Quote:

---

Originally Posted by Shaggy Hiker

You actually drew out the design fairly well. The rectangles may all be textboxes. The + and = signs would have to be in labels. You may also want a, b, and c to be labels, as well. Generally, a textbox is a place where a user can type something, but for a, b, and c, you don't really want the user to be able to type anything, right? If they are not allowed to edit the numbers in those boxes, then you should use labels rather than textboxes. In either case, fiddle around with the font, backcolor, forecolor, appearance, and borders to make them look the way you want.

Behind the scenes, you'd want three variables (possibly called a, b, and c) of type Double. Those would hold the values. Thus you might write:

Dim a As Double = 0.15
Dim b As Double = 0.5
Dim c As Double = 0.3

you would show these variables in the textboxes/labels with something like this:

<your control name here>.Text = a.ToString
<your next control name here>.Text = b.ToString
<your next control name here>.Text = c.ToString

What happens after that isn't so clear, though, as I'm not sure what step you would want the user to take next. Do they enter a value for the total and press a button?

---

@ Shaggy Hiker , first of all Thanks for your answer!
1. In this program i want the user to type any numbers (double nymbers) for a, b ,c and
2. there isn't other steps in this program., just this three number to give us one total. but as you say propably i need one button to do this. right ?

Thanks again for your time you and other people spend for me, i appreciate that

Quote:

---

Originally Posted by HyDrageN

@ Shaggy Hiker , first of all Thanks for your answer!
1. In this program i want the user to type any numbers (double nymbers) for a, b ,c and
2. there isn't other steps in this program., just this three number to give us one total. but as you say propably i need one button to do this. right ?

Thanks again for your time you and other people spend for me, i appreciate that

---

I would highly recommend using NumericUpDown controls instead of TextBoxes for allowing the user to type in numeric input

I agree on the numeric up down, since that would restrict the entry to just numbers. You would need to be sure to set the max, min, and step properties to reasonable values.

A button is pretty much essential. There is an alternative, but it is a pretty miserable one in practice. There are = buttons on calculators for a reason: You have to know when the user is done entering stuff. You have the same motivation. Technically, you could perform the calculations on every ValueChanged event for the controls, which would actually work fairly well, in this case, but it would mean that you would have a new value every time you changed any number in any way, and the value would be 0 until you had entered something into every box.

TextBox4.Text = TextBox1.Text * 0.15 + TextBox2.Text * 0.5 + TextBox3.Text * 0.3

4 Textboxes and 1 Button was all the program.

Can anyone tell me how to Calculate Double numbers ? when i type 5.6 6.7 8.4 the program is not calculating right.. is working only with integer numbers :/

Quote:

---

Originally Posted by HyDrageN

TextBox4.Text = TextBox1.Text * 0.15 + TextBox2.Text * 0.5 + TextBox3.Text * 0.3

4 Textboxes and 1 Button was all the program.

Can anyone tell me how to Calculate Double numbers ? when i type 5.6 6.7 8.4 the program is not calculating right.. is working only with integer numbers :/

---

NumericUpDown control
.Minimum = Decimal.MinValue
.Maximum = Decimal.MaxValue
.DecimalPlaces = 1
.InterceptArrowKeys = True

When they click the button, simply grab the NumericUpDown's Value property and you're set.

What you have should work ok, as long as certain bad conditions are met:

1) You have Option Strict OFF.
2) Nobody ever leaves a textbox blank, or otherwise enters something that can't be fully converted to a Double.

Those are bad conditions, though. The NumericUpDown would remove those concerns, in which case the button click event would look like this:

TextBox4.Text = (NumericUpDown1.Value * 0.15 + NumericUpDown2.Value * 0.5 + NumericUpDown3.Value * 0.3).ToString

Quote:

---

Originally Posted by Shaggy Hiker

What you have should work ok, as long as certain bad conditions are met:

1) You have Option Strict OFF.
2) Nobody ever leaves a textbox blank, or otherwise enters something that can't be fully converted to a Double.

Those are bad conditions, though. The NumericUpDown would remove those concerns, in which case the button click event would look like this:

TextBox4.Text = (NumericUpDown1.Value * 0.15 + NumericUpDown2.Value * 0.5 + NumericUpDown3.Value * 0.3).ToString

---

sorry guys i started using Visual Basic 5 days now
i don't know how it is work,
you have right but i don't know how to do all this staff that's why i started this topic for little help from professionals :)

JuggaloBrotha he wrote to me this program and thanks for his time
Thanks to all

Don't be disappointed HyDragen... Start your work and search the internet resource, you will get so many things, but if not, then come over here.