by Sagar Khatale (1 Submission)
Category: Math/Dates
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Wed 27th July 2005
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Simple Calculator
API Declarations
Dim opd(3) As Double, tno As Double
Dim opr(3) As String
Dim top1 As Integer, otop As Integer
Dim str As String, nstr As String, tstr As String, ostr As String, tstr1 As String
Dim DotPressed As Boolean
VBcoders
Private Sub cmd_Click(Index As Integer)
str = cmd(Index).Caption
nstr = nstr + str
Text1.Text = nstr
opd(top1) = Val(nstr)
End Sub
Private Sub cmddecimal_Click()
DotPressed = True
'if "." is prssed, integer number is not entered
'and fractional number has to be entered then
'1. set number to "0"
'2. place decimal point after "0"
'3. append the digit of fractional number after "."
If (nstr = "") Then
Text1.Text = "0"
nstr = "0"
End If
nstr = nstr + cmddecimal.Caption
Text1.Text = nstr
opd(top1) = Val(nstr)
End Sub
Private Sub cmdopr_Click(Index As Integer)
Calculate (Index)
End Sub
Private Sub Form_Load()
DotPressed = False
str = ""
nstr = ""
tstr = ""
ostr = ""
top1 = 0
otop = 0
End Sub
Public Sub Calculate(ind As Integer)
DotPressed = False
nstr = ""
str = ""
top1 = top1 + 1
tstr = cmdopr(ind).Caption
opr(otop) = tstr
If (otop = 1) Then
Select Case opr(0)
Case "+"
tno = opd(0) + opd(1)
MoveData (tno)
Case "-"
tno = opd(0) - opd(1)
MoveData (tno)
Case "*"
tno = opd(0) * opd(1)
MoveData (tno)
Case "/"
tno = opd(0) / opd(1)
MoveData (tno)
End Select
If (opr(0) = "=") Then
Text1.Text = opd(0)
top1 = 0
otop = 0
str = ""
nstr = ""
End If
Else
otop = otop + 1
End If
End Sub
Public Sub MoveData(tno As Double)
'Display result in the TextField
Text1.Text = tno
'Move data from [top] to [top-1] position into Stack
opd(0) = tno
opr(0) = opr(1)
top1 = 1
otop = 1
End Sub
