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#### FillByte

Declaration:
  Procedure FillByte(var X;Count:longint;Value:byte);
Description:
  FillByte fills the memory starting at X with Count bytes with value equal to Value.

  This is useful for quickly zeroing out a memory location. When the size of the memory location to be filled out is a multiple of 2 bytes, it is better to use Fillword (501), and if it is a multiple of 4 bytes it is better to use FillDWord (500), these routines are optimized for their respective sizes.

Errors:
  No checking on the size of X is done.
See also:
  Fillchar (499), FillDWord (500), Fillword (501), Move (536)

Listing: refex/ex102.pp

Program Example102;
{ Program to demonstrate the CompareWord function. }
Const
ArraySize = 100;
HalfArraySize = ArraySize Div 2;
Var
Buf1,Buf2 : Array[1..ArraySize] of Word;
I : longint;
Procedure CheckPos(Len : Longint);
Begin
Write('First ',Len,' words are ');
if CompareWord(Buf1,Buf2,Len)<>0 then
Write('NOT ');
Writeln('equal');
end;
begin
For I:=1 to ArraySize do
begin
Buf1[i]:=I;
If I<=HalfArraySize Then
Buf2[I]:=I
else
Buf2[i]:=HalfArraySize-I;
end;
CheckPos(HalfArraySize div 2);
CheckPos(HalfArraySize);
CheckPos(HalfArraySize+1);
CheckPos(HalfArraySize + HalfArraySize Div 2);
end.

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