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Custom Routines (Delphi and C++ Cross Reference Guide)

By Mike Prestwood

Delphi versus C++: A side by side comparison between Delphi and C++.

Language Details

Language Details is kind of a catch all for stuff that didn't make it into language basics nor any other category.

Custom Routines

[Other Languages] 

Languages Focus

For non-OOP languages, a custom routine is a function, procedure, or subroutine and for pure OOP languages, a custom routine is a class method. Hybrid languages (both non-OOP and OOP) combine both.

Delphi:   procedure, function

Delphi is a hybrid language so you can create either class methods (functions and procedures) or you can create global functions and procedures. When a function or procedure is part of a class, it is a class method.

[function/procedure] RoutineName : ReturnType;

As with C++, your custom routine must come before it's first usage or you have to prototype it in the Interface section.

Note: Contrast Delphi with Delphi Prism which is an OOP language (everything is within a class). Both Delphi and Delphi Prism are based on Object Pascal but implement OOP features differently and have some syntax differences too.

Syntax Example:
procedure SayHello(pName: String);
  ShowMessage('Hello ' + pName);
function Add(p1, p2 : Double): Double;
  Result := p1 + p2;

C++ is a hybrid language and as such offers global functions and class methods. A function must come before it's usage or you can prototype the function.

Syntax Example:
void sayHello(string pName) {
cout << "Hello " + pName + "\n";
int add(int p1, int p2) {
int result;
  result = p1 + p2;
return result;

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