Hi everyone! This is a simple calculator which programmed by me on Visual studio. Worked out on .NET 2.0 framework and used Visual Basic as the programming language. This calculator is absolutely looks like (and also the functionality) the windows calculator on accessories menu.
The code block for button click events is as below.
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Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "1") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "1") End If lastbtn = "in" End If End Sub Private Sub btn2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn2.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "2") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "2") End If lastbtn = "in" End If End Sub Private Sub btn3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn3.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "3") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "3") End If lastbtn = "in" End If End Sub Private Sub btn4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn4.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "4") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "4") End If lastbtn = "in" End If End Sub Private Sub btn5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn5.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "5") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "5") End If lastbtn = "in" End If End Sub Private Sub btn6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn6.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "6") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "6") End If lastbtn = "in" End If End Sub Private Sub btn7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn7.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "7") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "7") End If lastbtn = "in" End If End Sub Private Sub btn8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn8.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "8") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "8") End If lastbtn = "in" End If End Sub Private Sub btn9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn9.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "9") Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "9") End If lastbtn = "in" End If End Sub Private Sub btn0_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn0.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then txtDisplay.Text = "." End If If isdec = False Then If txtDisplay.Text <> "0." Then num = txtDisplay.Text.Length - 1 txtDisplay.Text = txtDisplay.Text.Insert(num, "0") End If Else If txtDisplay.Text = "." Then txtDisplay.Text = "0." End If num = txtDisplay.Text.Length txtDisplay.Text = txtDisplay.Text.Insert(num, "0") End If lastbtn = "in" End If End Sub Private Sub btnDot_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDot.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastbtn = "oprt" Or lastbtn = "sqrt" Then txtDisplay.Text = "0." End If isdec = True lastbtn = "in" End If End Sub Private Sub btnPlus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPlus.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastoprt <> "plus" Or lastbtn = "in" Then ram = txtDisplay.Text If lastoprt = "eq" Then result = txtDisplay.Text End If If lastbtn <> "oprt" Then If lastoprt = "plus" Then result = result + ram ElseIf lastoprt = "minus" Then result = result - ram ElseIf lastoprt = "mul" Then result = result * ram ElseIf lastoprt = "dev" Then result = result / ram Else result = result + ram End If End If lastbtn = "oprt" lastoprt = "plus" txtDisplay.Text = result If txtDisplay.Text.Contains(".") Then txtDisplay.Text = result Else txtDisplay.Text = result & "." End If isdec = False End If End If End Sub Private Sub btnMinus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMinus.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastoprt <> "minus" Or lastbtn = "in" Then ram = txtDisplay.Text If lastoprt = "eq" Then result = txtDisplay.Text End If If lastbtn <> "oprt" Then If lastoprt = "plus" Then result = result + ram ElseIf lastoprt = "minus" Then result = result - ram ElseIf lastoprt = "mul" Then result = result * ram ElseIf lastoprt = "dev" Then result = result / ram Else result = result + ram End If End If lastbtn = "oprt" lastoprt = "minus" txtDisplay.Text = result If txtDisplay.Text.Contains(".") Then txtDisplay.Text = result Else txtDisplay.Text = result & "." End If isdec = False End If End If End Sub Private Sub btnMul_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMul.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastoprt <> "mul" Or lastbtn = "in" Then ram = txtDisplay.Text If lastoprt = "eq" Then result = txtDisplay.Text End If If lastbtn <> "oprt" Then If lastoprt = "plus" Then result = result + ram ElseIf lastoprt = "minus" Then result = result - ram ElseIf lastoprt = "mul" Then result = result * ram ElseIf lastoprt = "dev" Then result = result / ram Else result = result + ram End If End If lastbtn = "oprt" lastoprt = "mul" txtDisplay.Text = result If txtDisplay.Text.Contains(".") Then txtDisplay.Text = result Else txtDisplay.Text = result & "." End If isdec = False End If End If End Sub Private Sub btnDev_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDev.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else If lastoprt <> "dev" Or lastbtn = "in" Then ram = txtDisplay.Text upperval = ram If lastoprt = "eq" Then result = txtDisplay.Text End If If lastbtn <> "oprt" Then If lastoprt = "plus" Then result = result + ram ElseIf lastoprt = "minus" Then result = result - ram ElseIf lastoprt = "mul" Then result = result * ram ElseIf lastoprt = "dev" Then result = result / ram Else result = result + ram End If End If lastbtn = "oprt" lastoprt = "dev" txtDisplay.Text = result If txtDisplay.Text.Contains(".") Then txtDisplay.Text = result Else txtDisplay.Text = result & "." End If isdec = False End If End If End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load txtDisplay.Text = "0." End Sub Private Sub btnEq_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEq.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else ram = txtDisplay.Text If lastoprt = "plus" Then result = result + ram ElseIf lastoprt = "minus" Then result = result - ram ElseIf lastoprt = "mul" Then result = result * ram ElseIf lastoprt = "dev" Then result = result / ram Else result = ram End If lastbtn = "oprt" lastoprt = "eq" txtDisplay.Text = result If txtDisplay.Text.Contains(".") Then txtDisplay.Text = result Else txtDisplay.Text = result & "." End If isdec = False End If End Sub Private Sub btnNeg_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNeg.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else ram = txtDisplay.Text If ram <> 0 Then If txtDisplay.Text.Contains("-") Then txtDisplay.Text = txtDisplay.Text.Remove(0, 1) Else txtDisplay.Text = txtDisplay.Text.Insert(0, "-") End If End If End If End Sub Private Sub btnC_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnC.Click txtDisplay.Text = "0." lastbtn = "oprt" lastoprt = "" isdec = False result = 0 ram = 0 mplus = 0 lowerval = 0 upperval = 0 lblDisplay.Text = "" End Sub Private Sub btnCe_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCe.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then result = 0 ram = 0 End If txtDisplay.Text = "0." lastbtn = "oprt" isdec = False End Sub Private Sub btnBack_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBack.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Or lastbtn <> "in" Then Beep() Else num = txtDisplay.Text.Length If txtDisplay.Text.Chars(num - 1) = "." Then If isdec = True Then isdec = False Else txtDisplay.Text = txtDisplay.Text.Remove(num - 2, 1) End If Else txtDisplay.Text = txtDisplay.Text.Remove(num - 1, 1) End If If num = 2 Or (txtDisplay.Text.Contains("-") And num = 3) Then txtDisplay.Text = "0." isdec = False lastbtn = "oprt" End If End If End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMplus.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else ram = txtDisplay.Text mplus = mplus + ram lblDisplay.Text = "M" End If lastbtn = "oprt" End Sub Private Sub btnSqrt_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSqrt.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else Dim sqrt As Double = 0 ram = txtDisplay.Text lastbtn = "sqrt" lastoprt = "sqrt" sqrt = ram ^ (1 / 2) txtDisplay.Text = sqrt If txtDisplay.Text.Contains(".") Then txtDisplay.Text = sqrt Else txtDisplay.Text = sqrt & "." End If isdec = False End If End Sub Private Sub btnMminus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMminus.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else mplus = 0 lblDisplay.Text = "" End If lastbtn = "oprt" End Sub Private Sub btnMr_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMr.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else txtDisplay.Text = mplus If txtDisplay.Text.Contains(".") Then txtDisplay.Text = mplus Else txtDisplay.Text = mplus & "." End If End If lastbtn = "oprt" End Sub Private Sub btnUndreone_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUndreone.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else Dim undrone As Double = 0 ram = txtDisplay.Text lastbtn = "sqrt" lastoprt = "sqrt" undrone = 1 / ram txtDisplay.Text = undrone If txtDisplay.Text.Contains(".") Then txtDisplay.Text = undrone Else txtDisplay.Text = undrone & "." End If isdec = False End If End Sub Private Sub btnMs_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMs.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else mplus = txtDisplay.Text lblDisplay.Text = "M" End If lastbtn = "oprt" End Sub Private Sub btnPercentage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPercentage.Click If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then Beep() Else lowerval = txtDisplay.Text If lowerval = 0 Then result = 0 Else result = upperval / lowerval * 100 End If txtDisplay.Text = result If txtDisplay.Text.Contains(".") Then txtDisplay.Text = result Else txtDisplay.Text = result & "." End If lastbtn = "oprt" End If End Sub Private Sub ExitToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ExitToolStripMenuItem.Click End End Sub Private Sub AboutToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AboutToolStripMenuItem.Click frmAbout.Show() End Sub End Class |
'2010-08-14 Calculator Solution By Rasan
Public Class frmMain
Dim lastbtn As String = "oprt"
Dim lastoprt As String
Dim result As Double = 0
Dim ram As Double = 0
Dim mplus As Double = 0
Dim num As Integer
Dim isdec As Boolean = False
Dim upperval As Double = 0
Dim lowerval As Double = 0
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "1")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "1")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn2.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "2")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "2")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn3.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "3")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "3")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn4.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "4")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "4")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn5.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "5")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "5")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn6.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "6")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "6")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn7.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "7")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "7")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn8.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "8")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "8")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn9.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "9")
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "9")
End If
lastbtn = "in"
End If
End Sub
Private Sub btn0_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn0.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Or txtDisplay.Text = "0." Then
txtDisplay.Text = "."
End If
If isdec = False Then
If txtDisplay.Text <> "0." Then
num = txtDisplay.Text.Length - 1
txtDisplay.Text = txtDisplay.Text.Insert(num, "0")
End If
Else
If txtDisplay.Text = "." Then
txtDisplay.Text = "0."
End If
num = txtDisplay.Text.Length
txtDisplay.Text = txtDisplay.Text.Insert(num, "0")
End If
lastbtn = "in"
End If
End Sub
Private Sub btnDot_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDot.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastbtn = "oprt" Or lastbtn = "sqrt" Then
txtDisplay.Text = "0."
End If
isdec = True
lastbtn = "in"
End If
End Sub
Private Sub btnPlus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPlus.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastoprt <> "plus" Or lastbtn = "in" Then
ram = txtDisplay.Text
If lastoprt = "eq" Then
result = txtDisplay.Text
End If
If lastbtn <> "oprt" Then
If lastoprt = "plus" Then
result = result + ram
ElseIf lastoprt = "minus" Then
result = result - ram
ElseIf lastoprt = "mul" Then
result = result * ram
ElseIf lastoprt = "dev" Then
result = result / ram
Else
result = result + ram
End If
End If
lastbtn = "oprt"
lastoprt = "plus"
txtDisplay.Text = result
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = result
Else
txtDisplay.Text = result & "."
End If
isdec = False
End If
End If
End Sub
Private Sub btnMinus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMinus.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastoprt <> "minus" Or lastbtn = "in" Then
ram = txtDisplay.Text
If lastoprt = "eq" Then
result = txtDisplay.Text
End If
If lastbtn <> "oprt" Then
If lastoprt = "plus" Then
result = result + ram
ElseIf lastoprt = "minus" Then
result = result - ram
ElseIf lastoprt = "mul" Then
result = result * ram
ElseIf lastoprt = "dev" Then
result = result / ram
Else
result = result + ram
End If
End If
lastbtn = "oprt"
lastoprt = "minus"
txtDisplay.Text = result
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = result
Else
txtDisplay.Text = result & "."
End If
isdec = False
End If
End If
End Sub
Private Sub btnMul_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMul.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastoprt <> "mul" Or lastbtn = "in" Then
ram = txtDisplay.Text
If lastoprt = "eq" Then
result = txtDisplay.Text
End If
If lastbtn <> "oprt" Then
If lastoprt = "plus" Then
result = result + ram
ElseIf lastoprt = "minus" Then
result = result - ram
ElseIf lastoprt = "mul" Then
result = result * ram
ElseIf lastoprt = "dev" Then
result = result / ram
Else
result = result + ram
End If
End If
lastbtn = "oprt"
lastoprt = "mul"
txtDisplay.Text = result
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = result
Else
txtDisplay.Text = result & "."
End If
isdec = False
End If
End If
End Sub
Private Sub btnDev_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDev.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
If lastoprt <> "dev" Or lastbtn = "in" Then
ram = txtDisplay.Text
upperval = ram
If lastoprt = "eq" Then
result = txtDisplay.Text
End If
If lastbtn <> "oprt" Then
If lastoprt = "plus" Then
result = result + ram
ElseIf lastoprt = "minus" Then
result = result - ram
ElseIf lastoprt = "mul" Then
result = result * ram
ElseIf lastoprt = "dev" Then
result = result / ram
Else
result = result + ram
End If
End If
lastbtn = "oprt"
lastoprt = "dev"
txtDisplay.Text = result
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = result
Else
txtDisplay.Text = result & "."
End If
isdec = False
End If
End If
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
txtDisplay.Text = "0."
End Sub
Private Sub btnEq_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEq.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
ram = txtDisplay.Text
If lastoprt = "plus" Then
result = result + ram
ElseIf lastoprt = "minus" Then
result = result - ram
ElseIf lastoprt = "mul" Then
result = result * ram
ElseIf lastoprt = "dev" Then
result = result / ram
Else
result = ram
End If
lastbtn = "oprt"
lastoprt = "eq"
txtDisplay.Text = result
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = result
Else
txtDisplay.Text = result & "."
End If
isdec = False
End If
End Sub
Private Sub btnNeg_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNeg.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
ram = txtDisplay.Text
If ram <> 0 Then
If txtDisplay.Text.Contains("-") Then
txtDisplay.Text = txtDisplay.Text.Remove(0, 1)
Else
txtDisplay.Text = txtDisplay.Text.Insert(0, "-")
End If
End If
End If
End Sub
Private Sub btnC_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnC.Click
txtDisplay.Text = "0."
lastbtn = "oprt"
lastoprt = ""
isdec = False
result = 0
ram = 0
mplus = 0
lowerval = 0
upperval = 0
lblDisplay.Text = ""
End Sub
Private Sub btnCe_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCe.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
result = 0
ram = 0
End If
txtDisplay.Text = "0."
lastbtn = "oprt"
isdec = False
End Sub
Private Sub btnBack_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBack.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Or lastbtn <> "in" Then
Beep()
Else
num = txtDisplay.Text.Length
If txtDisplay.Text.Chars(num - 1) = "." Then
If isdec = True Then
isdec = False
Else
txtDisplay.Text = txtDisplay.Text.Remove(num - 2, 1)
End If
Else
txtDisplay.Text = txtDisplay.Text.Remove(num - 1, 1)
End If
If num = 2 Or (txtDisplay.Text.Contains("-") And num = 3) Then
txtDisplay.Text = "0."
isdec = False
lastbtn = "oprt"
End If
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMplus.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
ram = txtDisplay.Text
mplus = mplus + ram
lblDisplay.Text = "M"
End If
lastbtn = "oprt"
End Sub
Private Sub btnSqrt_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSqrt.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
Dim sqrt As Double = 0
ram = txtDisplay.Text
lastbtn = "sqrt"
lastoprt = "sqrt"
sqrt = ram ^ (1 / 2)
txtDisplay.Text = sqrt
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = sqrt
Else
txtDisplay.Text = sqrt & "."
End If
isdec = False
End If
End Sub
Private Sub btnMminus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMminus.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
mplus = 0
lblDisplay.Text = ""
End If
lastbtn = "oprt"
End Sub
Private Sub btnMr_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMr.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
txtDisplay.Text = mplus
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = mplus
Else
txtDisplay.Text = mplus & "."
End If
End If
lastbtn = "oprt"
End Sub
Private Sub btnUndreone_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUndreone.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
Dim undrone As Double = 0
ram = txtDisplay.Text
lastbtn = "sqrt"
lastoprt = "sqrt"
undrone = 1 / ram
txtDisplay.Text = undrone
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = undrone
Else
txtDisplay.Text = undrone & "."
End If
isdec = False
End If
End Sub
Private Sub btnMs_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMs.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
mplus = txtDisplay.Text
lblDisplay.Text = "M"
End If
lastbtn = "oprt"
End Sub
Private Sub btnPercentage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPercentage.Click
If txtDisplay.Text.Contains("Infinity.") Or txtDisplay.Text.Contains("NaN.") Then
Beep()
Else
lowerval = txtDisplay.Text
If lowerval = 0 Then
result = 0
Else
result = upperval / lowerval * 100
End If
txtDisplay.Text = result
If txtDisplay.Text.Contains(".") Then
txtDisplay.Text = result
Else
txtDisplay.Text = result & "."
End If
lastbtn = "oprt"
End If
End Sub
Private Sub ExitToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ExitToolStripMenuItem.Click
End
End Sub
Private Sub AboutToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AboutToolStripMenuItem.Click
frmAbout.Show()
End Sub
End ClassHow does it looks? OK. just feel free to download the source code from the below link, study it and improve it.
Download: Calculator VS Project
