[RESOLVED] Calculator idea help

I'm trying to make a really simple calculator, which looks like this:

http://i.imgur.com/aD1Xd.png

The user should enter values in the three big textboxes, and between those enter either +, -, x or /. Pressing the button should calculate the answer. Now here's the question, how do i make it take what's in the smaller textboxes and use it in the code? Hard to explain, but let me show you how i was thinking.

Instead of this: richtextbox1.text = val(textbox1.text) * val(textbox1.text) I want to replace the * with what's in the small textboxes, kinda like this: richtextbox1.text = val(textbox1.text) (richtextbox1.text) val(textbox2.text)

thanks in advance

Quote:

---

Instead of this: richtextbox1.text = val(textbox1.text) * val(textbox1.text) I want to replace the * with what's in the small textboxes, kinda like this: richtextbox1.text = val(textbox1.text) (richtextbox1.text) val(textbox2.text)

---

i don't really understand about your request... can you explain it more clearly?

Quote:

---

Originally Posted by chipp

i don't really understand about your request... can you explain it more clearly?

---

Replace the * with what's in the small boxes

Here's how I would do it (with your design)

Code:

---

If rtxtBox1.text = "+" Then
txtBox3.Text = Val(textbox1.text) + Val(txtBox2)

ElseIf rtxtBox1.Text = "-" Then
txtBox3.Text = Val(textbox1.text) - Val(txtBox2)

ElseIf rtxtBox1.Text = "*" or "x" Then
txtBox3.Text = Val(textbox1.text) * Val(txtBox2)

ElseIf rtxtBox1.Text = "/" Then
txtBox3.Text = Val(textbox1.text) / Val(txtBox2)

End if

---

I would use if statements...
Not sure what the names of all your objects are... but ---- lets say textbox1 is what the user puts their arithmetic expression in and richtextbox1 is number 1, richtextbox 2 is number 2, and richtextbox 3 is the answer:
If textbox1.text = "*" then richtextbox3.text = val(richtextbox1.text) * val(richtextbox2.text)
If textbox1.text = "/" then richtextbox3.text = val(richtextbox1.text) / val(richtextbox2.text)
and so on, and so on....

What powerstack said but with Select Case (only cos it's less typing!)

vb.net Code:

Select Case textbox1.text
Case "+"
'do the addition
Case "-"
'do the subtraction
etc.
End Select

Quote:

---

Originally Posted by dunfiddlin

(only cos it's less typing!)

---

...plus it's better looking :D

try this:

vb.net Code:

dim dt as new datatable
richtextbox1.text = dt.compute(textbox1.text & richtextbox1.text & textbox2.text, nothing).tostring

Quote:

---

Originally Posted by .paul.

try this:

vb.net Code:

dim dt as new datatable
richtextbox1.text = dt.compute(textbox1.text & richtextbox1.text & textbox2.text, nothing).tostring

---

Oooh! Cunning! :cool:

good looking too:D

Quote:

---

Originally Posted by .paul.

try this:

vb.net Code:

dim dt as new datatable
richtextbox1.text = dt.compute(textbox1.text & richtextbox1.text & textbox2.text, nothing).tostring

---

Thanks paul!



view this thread for finished program: http://www.vbforums.com/showthread.p...31#post4233531

Quote:

---

Originally Posted by .paul.

try this:

vb.net Code:

dim dt as new datatable
richtextbox1.text = dt.compute(textbox1.text & richtextbox1.text & textbox2.text, nothing).tostring

---

Now that's thinking outside the box! Never in a million years could I've come up with a solution like that.

Quote:

---

Originally Posted by DavesChillaxin

Now that's thinking outside the box! Never in a million years could I've come up with a solution like that.

---

I know right! :)

Yep --- I think Paul wins the contest for sure....

But Erik --- Let me give you a suggestion for something else to try.... Try to make a calculator that's like the Microsoft Calculator that comes with Windows.... That was one of my first projects because math is one of the first things you learn in VB and it just sounded like fun to try and do. I did a pretty spiffy job I think. You just have to think about what happens when the user hits the number buttons and the numbers appear in the textbox ---- simple math won't do it. You have to use strings to get the job done and then convert those strings when it's time to do the math.

With mine I did all the basic arithmatic functions plus a memory +, memory -, and memory recall button. And just to impress my wife, I made a button called "secret" that prints "I love [wife's name]!!!!" . I never did show her the calculator program (I work overseas so I do a lot of my coding on a different computer than my home one) but I'll get around to it one day...

Ahhh, nerd love --- ain't it grand? =)

Quote:

---

Originally Posted by .paul.

try this:

vb.net Code:

dim dt as new datatable
richtextbox1.text = dt.compute(textbox1.text & richtextbox1.text & textbox2.text, nothing).tostring

---

Thanks again, but could you explain what "nothing" and "tostring" does/mean? I'd like to understand everything that i put in my programs :)

dt.compute takes 2 parameters. 1st is expression to compute, 2nd is filter + in my example it's unused. hence nothing
dt.compute returns an object so we need to convert it to a string hence toString