DelphiBasics
High
Function
Returns the highest value of a type or variable System unit
 function High ( type or variable ) : Ordinal type;
Description
The High function returns the highest allowed value of either a type or variable of that type.
 
It only applies to characters, arrays, enumerations and short strings.
 
For arrays, it returns the higest index.
Notes
For multi-dimensional arrays, it returns the highest index of the first subarray (the left most definition of array range).

The size of an open array is given independent of the starting index of the array. It is the length of the array - 1.
Related commands
Low Returns the lowest value of a type or variable
 Author links

 Buy Website Traffic at
 Buywebsitetrafficexperts.com

 Buy Proxies at
 Buyproxies.io
 
 Download this web site as a Windows program.




 
Example code : High applied to character, array, enumeration and short strings
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  // The System unit does not need to be defined
  SysUtils,
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

type
  // Declare character, array and enumerated data types
  TChar  = char;
  TArray = array [3..7] of Integer;
  TEnum  = (Mon=5, Tue, Wed, Thu, Fri, Sat, Sun);
  TShort = shortstring;

var
  // Declare variables of the above data types
  myChar  : TChar;
  myArray : TArray;
  myEnum  : TEnum;
  myShort : TShort;

begin
  // Show the high values of the types and variables
  ShowMessage('High(TChar)   = '+IntToStr(Ord(High(TChar))));
  ShowMessage('High(myChar)  = '+IntToStr(Ord(High(myChar))));
  ShowMessage('High(TArray)  = '+IntToStr(High(TArray)));
  ShowMessage('High(myArray) = '+IntToStr(High(myArray)));
  ShowMessage('High(TEnum)   = '+IntToStr(Ord(High(TEnum))));
  ShowMessage('High(myEnum)  = '+IntToStr(Ord(High(myEnum))));
  ShowMessage('High(TShort)  = '+IntToStr(Ord(High(TShort))));
  ShowMessage('High(myShort) = '+IntToStr(Ord(High(myShort))));
end;
 
end.
Hide full unit code
   High(TChar)   = 255
   High(myChar)  = 255
   High(TArray)  = 7
   High(myArray) = 7
   High(TEnum)   = 11
   High(myEnum)  = 11
   High(TShort)  = 255
   High(myShort) = 255
 
Delphi Programming Neil Moffatt 2002 - 2017. All rights reserved.  |  Home Page