Exercise 52 in VB.NET

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Exercise 52
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Assume the String variable CH contains a single character typed from the keyboard Write a Select Case structure that will determine whether this character is a vowel ( a , e , i , o or u ), a digit ( 0 To 9 ) or a consonant a) Assume only lower-case and no punctuation characters have been typed b) Allow for upper and lower-case characters
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523 Selection Structures within Classes
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Of course, the real power of the selection structures, If and Select Case, comes from our ability to use them to make decisions within a class Effectively, we enable objects to decide on which code to execute based on the conditions in their member variables or elsewhere The idea is to try to develop classes in such a way that their objects are as autonomous as possible An object should never be able to perform an operation that did anything contrary to the logic of the class it belongs to
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5231 Example: The Bank Account revisited
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The BankAccount class is a good example of this, ensuring that cash could only be withdrawn if there was enough in the account to cover the withdrawal We can extend this behaviour by allowing an account to go into overdraft provided one has been arranged with the bank (Listing 516)
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Module Bank2 ' Updated to allow an overdraft facility Public Class BankAccount Public AccountName As String Public OverdraftAvailable As Boolean Private AgreedOverdraftAmount As Decimal Private Balance As Decimal Public Sub Deposit(ByVal Amount As Decimal) Balance += Amount End Sub Public Sub SetOverdraft(ByVal Amount As Decimal) If OverdraftAvailable Then AgreedOverdraftAmount = Amount End If End Sub Public Function Withdraw(ByVal Amount As Decimal) _ As Boolean If Amount <= Balance Then Balance -= Amount Return True ElseIf OverdraftAvailable Then If Amount <= _ Balance + AgreedOverdraftAmount Then Balance -= Amount Return True End If Else Return False End If End Sub Public ReadOnly Property CurrentBalance() As Decimal Get Return Balance End Get End Property End Class Sub Main() Dim MyAccount As BankAccount = New BankAccount() MyAccountAccountName = "John Smith" ConsoleWriteLine("Account name: {0}", _ MyAccountAccountName)
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ConsoleWriteLine("Account balance: {0}", _ MyAccountCurrentBalance) MyAccountDeposit(100) ConsoleWriteLine("Account balance: {0}", _ MyAccountCurrentBalance) If MyAccountWithdraw(150) Then ConsoleWriteLine("Account balance: {0}", _ MyAccountCurrentBalance) Else ConsoleWriteLine("Withdrawal not allowed") End If MyAccountOverdraftAvailable = True MyAccountSetOverdraft(100) If MyAccountWithdraw(150) Then ConsoleWriteLine("Balance (with o/d): {0}", _ MyAccountCurrentBalance) Else ConsoleWriteLine("Withdrawal not allowed") End If End Sub End Module Listing 516: The BankAccount class modi ed to allow for overdrafts
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In Listing 516, the Withdraw method has been changed from a Sub to a Function, so that it can return a Boolean result: True if the withdrawal was successful, False if not The code in Sub Main() now makes two attempts to make a withdrawal; one with no overdraft agreed, and the second, successful, attempt with an agreed overdraft of 100 Hopefully you can see the power of selection statements, both within a class and in the code that makes use of objects of a class The trick of replacing a sub with a function that returns a Boolean result is useful when it is possible to allow the class to decide whether or not to perform an operation since, otherwise, the code using the object would not be aware of whether an operation had been successful or not
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Exercises 53
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The BankAccount class in Listing 516 would bene t from a Report function that will return a String result based on the following evaluation: Balance is positive or zero The account is in credit Balance is negative and there is no agreed overdraft The account is overdrawn Balance is overdrawn by no more than AgreedOverdraftAmount The account is within allowed overdraft limit Balance is overdrawn by more than AgreedOverdraftAmount Account withdrawals have exceeded the agreed overdraft amount Write this function Write a function that will return the maximum amount that could be withdrawn from the account without exceeding any overdraft limit that existed
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