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   ► KBTo/From GuidesDelphi Prism  Print This     

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

By Mike Prestwood

Delphi Prism versus C++: A side by side comparison between Delphi Prism 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 Prism:   method, procedure, function

In Prism, everything is within a class (just like with C#, VB.Net, and Java). So you create class methods using the method keyword. Alternatively, you can use procedure or function if you want the compiler to enforce returning or not returning a value.

[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.

Syntax Example:
method Form1.IntroduceYourself;
begin
  MessageBox.Show("Hello, I do not have a name yet.");
end;

procedure Form1.SayHello(pName: String);
begin
  MessageBox.Show("Hello " + pName);
end;
 
function Form1.Add(p1, p2 : Double): Double;
begin
  Result := p1 + p2;
end;
C++: 

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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