[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'System' (#rtl)

# Inc

Increase value of integer variable

## Declaration

Source position: system.fpd line 50

 procedure Inc( var X: TOrdinal );procedure Inc( var X: TOrdinal; Increment: TOrdinal );

## Description

Inc increases the value of X with Increment. If Increment isn't specified, then 1 is taken as a default.

Inc can be used on typed pointers: in that case it increases the value with Increment the size of the type the pointer points to. This works independently of the setting of the \$POINTERMATH directive.

## Errors

If range checking is on, then A range check can occur, or an overflow error, when an attempt is made to increase X over its maximum value.

 Dec Decrease value of variable

## Example

```Program Example32;

{ Program to demonstrate the Inc function. }

Const
C : Cardinal  = 1;
L : Longint   = 1;
I : Integer   = 1;
W : Word      = 1;
B : Byte      = 1;
SI : ShortInt = 1;
CH : Char     = 'A';

begin
Inc (C);     { C:=2    }
Inc (L,5);   { L:=6    }
Inc (I,-3);  { I:=-2   }
Inc (W,3);   { W:=4    }
Inc (B,100); { B:=101  }
Inc (SI,-3); { Si:=-2  }
Inc (CH,1);  { ch:='B' }
end.

```