Delphi Language Guide Delphi for Microsoft Win32 Delphi for the Microsoft. Net framework

part is sometimes called the routine's body or block.
Procedure Declarations
A procedure declaration has the form
procedure procedureName(parameterList); directives;
  localDeclarations;
begin
  statements
end;
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---

where procedureName is any valid identifier, statements is a sequence of statements that execute when the
procedure is called, and (parameterList), directives;, and localDeclarations; are optional.
Here is an example of a procedure declaration:
procedure NumString(N: Integer; var S: string);
var
  V: Integer;
begin
  V := Abs(N);
  S := '';
  repeat
    S := Chr(V mod 10 + Ord('0')) + S;
    V := V div 10;
  until V = 0;
  if N < 0 then S := '-' + S;
end;
Given this declaration, you can call the 
NumString
 procedure like this:
NumString(17, MyString);
This procedure call assigns the value '17' to 
MyString
 (which must be a string variable).
Within a procedure's statement block, you can use variables and other identifiers declared in the localDeclarations
part of the procedure. You can also use the parameter names from the parameter list (like 
N
 and 
S
 in the previous
example); the parameter list defines a set of local variables, so don't try to redeclare the parameter names in the
localDeclarations section. Finally, you can use any identifiers within whose scope the procedure declaration falls.