Custom Routines (C# and Delphi Cross Reference Guide)

C# requires () in both the function declaration, and when it's invoked. Leave off the parens to signify a property.

ReturnType RoutineName()

void SayHello(String pName)
{
  MessageBox.Show("Hello " + pName);
}
 

int Add(int a, int b) 
{
  return a + b;
}

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.

procedure SayHello(pName: String);
begin
  ShowMessage('Hello ' + pName);
end;

function Add(p1, p2 : Double): Double;
begin
  Result := p1 + p2;
end;

 Delphi Custom Routines (procedure, function)