RTL.ComplexNumbers Sample

This sample demonstrates various features of records.

Location

You can find the ComplexNumbers sample project at:

• Start > Programs > Embarcadero RAD Studio > Samples > Delphi > RTL > ComplexNumbers
• Subversion Repository:
  • You can find Delphi code samples in GitHub Repositories. Search by name into the samples repositories according to your RAD Studio version.

Description

This application provides an implementation for a record that handles complex numbers. It exemplifies operator overloading, visibility specifiers, instance methods, class methods, and class variables.

How to Use the Sample

1. Navigate to Start | Programs | Embarcadero RAD Studio Athens | Samples and open Win32OperatorOverload.dproj.
2. Press F9 or choose Run > Run.

Files

The project has two source files:

File	Contains
Vassbotn.Vcl.Complex.pas	The implementation for TComplex, a record that handles complex numbers.
Win32OperatorOverload.dpr	A program that uses TComplex instances, operators, and methods.

Classes

TComplex implements a record that manages complex numbers. It provides fields, operators, instance methods, class methods, and class variables for operations with complex numbers.

Implementation

• A constructor is simulated by using a private class procedure and the initialization section of the unit.
• The TComplex class overloads some of the Delphi operators: Add, Substract, Multiply, Divide, Negative, Equal, NotEqual, and so on.
• TComplex contains class variables, like Symbol and SymbolBeforeImaginary, that belong to the entire class and not to individual instances.
• TComplex implements both class methods (for example class function From(const AReal, AImaginary: Double): TComplex; static;) and instance methods, for example function ToString: System.String;.
• Members of TComplex have different visibility specifiers: strict private, private, and public.

Uses

• Records

See Also

• Operator Overloading (Delphi)
• Classes and Objects#Visibility of Class Members