Hello DEVPPL,
I'm working on an exercise called "Long-Distance Calls," which asks me to let the user choose a phone rate between three radio buttons and multiply it by the amount of minutes (inputted into a textbox). The result should appear in another textbox.
It also asks me to include error checking in the following ways: the minutes input by the user must be numeric, and it must be greater than zero.
I've created the three radio buttons with their respective labels along with the input textbox (minutes) and the output textbox (charges).
Regarding the code, this is what I've come up with up till this point:
'Take the user-input
Dim intNumber As Integer ' Number of minutes
Dim dblRatePerMinute As Double ' Rate Per Minute
Dim textCharges As Double ' Charges
'Check the number of minutes.
If Integer.TryParse(textNumber.Text, intNumber) Then
End If
'Take the newly converted integer and multiply it by the selected radio button..
If radDaytime.Checked = True Then
dblRatePerMinute = 0.07
ElseIf radEvening.Checked = True Then
dblRatePerMinute = 0.12
ElseIf radOffPeak.Checked = True Then
dblRatePerMinute = 0.05
textCharges = CDbl(textNumber.Text) * dblRatePerMinute
Else
'Display an error message.
MessageBox.Show("The input must be numeric")
End If
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I know this is probably very wrong! Sorry but I'm a complete amateur! Whatever help you can give me will be appreciated. Thank you for your time!
