HI
this is pradeep, i m vb.net learner,my English not good dont mind
what i need is i what to get all information within the parenthesis of Sin().
for example , i have created one one textbox in my user interface.
i wanted users to enter some trigonometric expresiions like " sin(90+(25+25))"
for that i what all the information present with in the parenthesis of sin()
can anyone give the code to help me
thanks in advance

if user enters "sin(90+(25*2))+sin(45+(25*2))"
how can i get "90+(25*2)" and "45+(25*2)"
please help me.thank you for your reply

you will have to parse the line yourself I think. check out the instr, and mid$ functions. The presence of a second set of brackets is going to make it tricky. have a think about the logic and post what you come up with.

Private Function GetMid(somestring As String) As String
Dim startPos As Integer = somestring.IndexOf("sin(") + 4

Dim parenCount As Integer = 1
Dim innerLen As Integer = 0

For i As Integer = startPos To somestring.Length

If somestring(i) = "("c Then
parenCount += 1
End If

If somestring(i) = ")"c Then
parenCount -= 1
End If

If parenCount = 0 Then
Exit For
End If

innerLen += 1
Next


Return somestring.Substring(startPos, innerLen)
End Function

the above code is when textbox has only one sin() function,how to get if more than one sin() present in textbox??

How are these sins:D present in the TextBox?
1 sin per each line?:D
2 or more sins per line?:D
Or is it just a TextBox full of sins?:D with no hope of ever going to heaven.LMAOOO:D

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