How to accpet percent and limit user usage.

thankins

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Sep 24, 2003
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Does anyone know how to accept percent and decimals in a text box? Also does anyone know how to limit the times a user can input data?

Here is a little background about the program i am working on:

I need to create an application that calculates and displays payroll for 4 employees. It accepts the following data from the user.
1) Num of hours worked.
2.) Hourly Rate.
3)Precent withheld for Fica.
4)Precent for federal.
5.Percent for State.

It then must NOT allow the user to enter anymore data after the 4 employees have been entered!

My problem is that I dont know how to allow the user to enter a percent in a textbox or decimal, if they enter either of those the program won't calculate it. But if i enter a whole number it works fine! Also I dont know how to limit the user from entering more then 4 names. I thought about using a Do While loop by but didnt know where to place it.

Here is my code
Code:
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
        End

    End Sub

    Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
        txtState.Text = " "
        txtFederal.Text = " "
        txtFica.Text = " "
        txtHours.Text = " "
        txtRate.Text = " "
        txtName.Text = " "
        lstOutput.Items.Clear()
        txtName.Focus()

    End Sub

    Private Sub txtHours_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtHours.Validating
        'Vaildates that a number has been entered into the text box

        If Not IsNumeric(txtHours.Text) Then
            MessageBox.Show("Hours worked must be a number.", "Invaild Input", MessageBoxButtons.OK, _
            MessageBoxIcon.Error)

            'Select the existing text in the text box.
            txtHours.SelectionStart = 0
            txtHours.SelectionLength = txtHours.Text.Length
            'Set the e.Cacel to true so the focus will stay in the control
            e.Cancel = True
        Else
            e.Cancel = False
        End If
    End Sub


    Private Sub txtRate_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtRate.Validating
        'Vaildates that a number has been entered into the text box

        If Not IsNumeric(txtRate.Text) Then
            MessageBox.Show("Pay Rate must be a number.", "Invaild Input", MessageBoxButtons.OK, _
            MessageBoxIcon.Error)

            'Select the existing text in the text box.
            txtRate.SelectionStart = 0
            txtRate.SelectionLength = txtRate.Text.Length
            'Set the e.Cacel to true so the focus will stay in the control
            e.Cancel = True
        Else
            e.Cancel = False
        End If
    End Sub

    Private Sub txtState_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtState.Validating
        'Vaildates that a number has been entered into the text box

        If Not IsNumeric(txtState.Text) Then
            MessageBox.Show("State taxes must be a number.", "Invaild Input", MessageBoxButtons.OK, _
            MessageBoxIcon.Error)

            'Select the existing text in the text box.
            txtState.SelectionStart = 0
            txtState.SelectionLength = txtState.Text.Length
            'Set the e.Cacel to true so the focus will stay in the control
            e.Cancel = True
        Else
            e.Cancel = False
        End If
    End Sub

    Private Sub txtFederal_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtFederal.Validating
        'Vaildates that a number has been entered into the text box

        If Not IsNumeric(txtFederal.Text) Then
            MessageBox.Show("Federal taxes must be a number.", "Invaild Input", MessageBoxButtons.OK, _
            MessageBoxIcon.Error)

            'Select the existing text in the text box.
            txtFederal.SelectionStart = 0
            txtFederal.SelectionLength = txtFederal.Text.Length
            'Set the e.Cacel to true so the focus will stay in the control
            e.Cancel = True
        Else
            e.Cancel = False
        End If
    End Sub

    Private Sub txtFica_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtFica.Validating
        'Vaildates that a number has been entered into the text box

        If Not IsNumeric(txtFica.Text) Then
            MessageBox.Show("F.I.C.A. withholdings must be a number.", "Invaild Input", MessageBoxButtons.OK, _
            MessageBoxIcon.Error)

            'Select the existing text in the text box.
            txtFica.SelectionStart = 0
            txtFica.SelectionLength = txtFica.Text.Length
            'Set the e.Cacel to true so the focus will stay in the control
            e.Cancel = True
        Else
            e.Cancel = False
        End If
    End Sub

    Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
        'Declares local variables for btnCalculate_Click Method
        Dim empName As String
        Dim hrRate, hrsWorked As Single
        Dim stateTax, fedTax As Single
        Dim totalPay, grossPay, ficaTax As Single

        'Gets data,compute payroll,display results

        Call InputData(empName, hrRate, hrsWorked, fedTax, ficaTax, stateTax)
        grossPay = Gross_Pay(hrRate, hrsWorked)
        fedTax = Fed_Tax(grossPay, fedTax)
        ficaTax = Fica_Tax(grossPay, ficaTax)
        stateTax = State_Tax(grossPay, stateTax)
        totalPay = CSng(Total_Pay(grossPay, ficaTax, fedTax, stateTax))
        Call ShowPayroll(empName, grossPay, totalPay, ficaTax, fedTax, stateTax)

    End Sub
    Sub InputData(ByRef empName As String, ByRef hrRate As Single, ByRef hrsWorked As Single, ByRef fedTax As Single, ByRef ficaTax As Single, ByRef stateTax As Single)

        ' Get payroll data for employee
        empName = txtName.Text
        hrRate = CInt(txtRate.Text)
        hrsWorked = CInt(txtHours.Text)
        fedTax = CSng(txtFederal.Text)
        ficaTax = CSng(txtFica.Text)
        stateTax = CSng(txtState.Text)


    End Sub

    Sub ShowPayroll(ByRef empName As String, ByRef pay As Single, ByRef totalPay As Single, ByRef ficaTax As Single, ByRef fedTax As Single, ByVal stateTax As Single)
        ' Payroll output for listbox
        
        lstOutput.Items.Add("Payroll results for " + (empName))
        lstOutput.Items.Add("     Gross pay this period:" + FormatCurrency(pay))
        lstOutput.Items.Add("     F.I.C.A. tax withheld:" + FormatCurrency(ficaTax))
        lstOutput.Items.Add("     Federal Income tax withheld:" + FormatCurrency(fedTax))
        lstOutput.Items.Add("     State Income tax withheld:" + FormatCurrency(stateTax))
        lstOutput.Items.Add("     Net pay:" + FormatCurrency(totalPay))
    End Sub

    Function Gross_Pay(ByRef hrWage As Single, ByRef hrsWorked As Single) As Single
        ' Compute weekly pay before taxes
        If hrsWorked <= 40 Then
            Gross_Pay = hrsWorked * hrWage
        Else
            Gross_Pay = CSng(40 * hrWage + (hrsWorked - 40) * 1.5 * hrWage)
        End If
    End Function

    Function Total_Pay(ByRef grossPay As Single, ByRef ficaTax As Single, ByRef fedTax As Single, ByRef stateTax As Single) As String
        ' Compute amount of net pay
        Total_Pay = CStr(grossPay - ficaTax - fedTax - stateTax)
    End Function

    Function Fed_Tax(ByRef grossPay As Single, ByRef fedTax As Single) As Single
        'Compute amount to be taken for Federal Tax
        Fed_Tax = grossPay * fedTax


    End Function

    Function Fica_Tax(ByRef grossPay As Single, ByRef ficaTax As Single) As Single
        ''Compute amount to be taken for FICA Tax
        Fica_Tax = grossPay * ficaTax


    End Function

    Function State_Tax(ByRef grossPay As Single, ByRef stateTax As Single) As Single
        'Compute amount to be taken for State Tax
        State_Tax = grossPay * stateTax

    End Function

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class
 
To convert any variable to a string either put +"" after it or ToString()

To limit the amout of times a user inputs data, use a couple global variables along with the TextChanged event. When the user starts typing set a bool variable to true and then in a buttonClick event or whatever you are using for the user to submit one box check if the bool variable is true, set it back to false, then increment a global counter variable: ++count.
 
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