Dec

Decrements a variable.

Declaration

procedure Dec(var X[ ; N: Longint]);

Target

Windows, Real, Protected

Remarks

X is an ordinal-type variable or a variable of type PChar if the extended syntax is enabled, and N is an integer-type expression. X is decremented by 1, or by N if N is specified; that is, Dec(X) corresponds to X := X - 1, and Dec(X, N) corresponds to X := X - N.

Dec generates optimized code and is especially useful in a tight loop.

See Also

Inc

Pred

Succ

Sample Code

{Dec.PAS}
{Sample code for the Dec procedure.}

var
  IntVar: Integer;
  LongintVar: Longint;
begin
  Intvar := 10;
  LongintVar := 10;
  Dec(IntVar);   { IntVar := IntVar - 1 }
  Dec(LongintVar, 5);  { LongintVar := LongintVar - 5 }
end.