[fpc-pascal]I don't Understand Array

[Michael.VanCanneyt at Wisa.be]

On Thu, 15 Feb 2001, [iso-8859-1] Luis Del Aguila Mejía wrote:

> When declare a Array variable with character, The compiler add 3 character,
> see the next code :
> 

Turn on range checking and you will get a range check error.
What you get is completely normal; the code accesses
the variables 'before' m[0]; If range checking is off, this is allowed.

Michael.


> var
>    antes:char;
>    m     : array [0..3] of char;
>    despues : char;
> begin
>     antes:='a';
>     m:='hola';
>     despues:='z';
>     Writeln('m[-4] : ',m[-4]);     // variable antes
>     Writeln('m[-3] : ',m[-3]);     // 1 byte
>     Writeln('m[-2] : ',m[-2]);     // 1 byte
>     Writeln('m[-1] : ',m[-1]);     // 1 byte
>     Writeln('m[0] : ',m[0]);        //h
>     Writeln('m[1] : ',m[1]);        //o
>     Writeln('m[2] : ',m[2]);       //l
>     Writeln('m[3] : ',m[3]);       //a
>     Writeln('m[4] : ',m[4]);       //z variable despues
>     Writeln('Tamanio de m : ',Sizeof(m));
>     Write('Presione Enter ... ');
>     Readln()
> end;
> 
> Att.
> Luis Del Aguila
> aguila3000 at terra.com.pe
> 
> 
> _______________________________________________
> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
> http://lists.freepascal.org/mailman/listinfo/fpc-pascal
>