Dec

Declaration:

Procedure Dec (Var X : Any ordinal type[; Decrement : Longint]) ;

Description:

Dec decreases the value of X with Decrement. If Decrement isn't specified, then 1 is taken as a default.

Errors:

A range check can occur, or an underflow error, if you try to decrease X below its minimum value.

See also:

Inc

Example

Program Example14;

{ Program to demonstrate the Dec function. }

Var 
  I  : Integer;
  L  : Longint;
  W  : Word;
  B  : Byte;
  Si : ShortInt;

begin
 I:=1;
 L:=2;
 W:=3;
 B:=4;
 Si:=5;
 Dec (i);    { i:=0  }
 Dec (L,2);  { L:=0  }
 Dec (W,2);  { W:=1  }
 Dec (B,-2); { B:=6  }
 Dec (Si,0); { Si:=5 }
end.