Borland C++ Builder 5 by Калверт Ч., Рейсдорф К.

By Калверт Ч., Рейсдорф К.

Энциклопедия программиста для Borland C++Builder продолжает серию книг о C++Builder, начатую Чарли Калвертом после выхода в свет первой версии этого продукта. Все без исключения авторы книги имеют не только многолетний опыт создания коммерческих продуктов при помощи систем программирования C++Builder и Delphi, но и принимали непосредственное участие в написании большого количества книг соответствующей тематики.

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For example, ifyou have a string that uses commas to designate the thousands position, you need to use the enumerator AllowThousands. Ifyou have a string that uses a decimal, you need to use the enumerator AllowDecimal. If you have more than one type of character to allow for, add the enumerators together. NET Use the Parse() method of the data type class to convert a string to the data type. Pass the string as the first parameter. If the string has non-numeric characters, tell the Parse() method to allow them bypassing a NumberStyles enumerator as the second parameter.

It uses the Flags attribute of the enumerated class so that this information can be stored as bit values. The first two bits store the user's position and the next two bits store the users department. Bit manipulation is used to determine the employee's position or department by doing an AND with the two bits that apply to each. Writeline() method. NET 'Copyright (c)2001 by Bischof Systems, Inc. Module Module1 Enum EmpRecord 'The "&H" prefix specifies a hexidecimal constant Staff = &H1 Manager = &H2 Accounting = &H4 Advertising = &H8 End Enum Sub Main() Dim employee As EmpRecord 'Create a variable representing a manager in the accounting dept.

F is the result of adding 5 to E. NET is the ability to use the Flags attribute. This enables you to perform Boolean operations among multiple entries. Using a Boolean variable to store a value is a way to save multiple pieces of data without having to create multiple variables. You can test if a variable has a bit set by doing Boolean operations on it. NET Use the attribute to signify an enumerated type that stores Boolean values. Enum Bits Entryl = &Hl Entry2 = &H2 Entry3 = &H4 End Enum C# Use the attribute to signify an enumerated type that stores Boolean values.

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Borland C++ Builder 5 by Калверт Ч., Рейсдорф К.
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