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Array (Delphi and Corel Paradox Cross Reference Guide)

By Mike Prestwood

Delphi versus Corel Paradox: A side by side comparison between Delphi and Corel Paradox.

Data Structures

Data structures allow you to store and work with data. Common data structures include arrays, associative arrays, etc.

Array

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A data structure in which individual values (called elements or items) may be located by reference to one or more integer index variables, the number of such indices being the number of dimensions in the array.

Arrays can start with an index value of 0 or 1, sometimes referred to as 0 based or 1 based.

Delphi: x=Array[0..3] of string;

Delphi supports both static and dynamic arrays as well as single and multi dimensional arrays.

Syntax Example:

var
  MyArray: array[0..3] of string;
  i: Integer;
begin
  MyArray[0] := 'Mike';
  MyArray[1] := 'Lisa';
  MyArray[2] := 'Felicia';
  MyArray[3] := 'Nathan';

  for i := 0 to High(MyArray) do
    ShowMessage(MyArray[i]);
end;

Delphi Array (x=Array[0..3] of string;) 1 certification question.

Corel Paradox: Array[] type

Arrays in ObjectPAL use a 1-based subscript (also known as an index). Use [] with a subscript to refer to an element (i.e. MyArray[1], MyArray[2]).

The number of elements for a given array in ObjectPAL are either fixed or resizeable. Specify the size when you declare it for fixed. Use size() to get the number of elements, size() returns 0 if the array has no elements. Use setSize(), grow(), addLast(), etc. to add elements to an array.

Syntax Example:

var
  MyArray Array[4] String ;Fixed size array.
  i LongInt
endVar
MyArray[1] = "Mike"
MyArray[2] = "Lisa"
MyArray[3] = "Felicia"
MyArray[4] = "Nathan"
if MyArray.size() > 0 then
  for i from 1 to MyArray.size()
    msgInfo("", MyArray[i])
  endFor
endIf

ObjectPAL Array (Array[] type) 1 certification question.