Jak se to používá? – Delphi – Fórum – Programujte.com

Mám program,který sčítá čísla v mřížce(stringgrid)ale zajímalo by mě jak se tady použila funkce val...nebo jak bych to vysvětlil....jak používá ty proměnné,protože ani následující podmínka mi moc nepomohla....nevíte tedy jak se používá ta fce val??

procedure TForm1.Button4Click(Sender: TObject);

var s,i,x,c:integer; r:string;

begin s:=0;

      for i:=1 to stringgrid1.colcount do

       begin

        r:=stringgrid1.cells[i-1,1];

        val(r,x,c);

        if c=0 then s:=s+x;



       end;

      edit3.Text:=inttostr(s)

end;

Nápověda v Delphi:

In Delphi code, Val converts the string value S to its numeric representation, as if it were read from a text file with Read.

S is a string-type expression; it must be a sequence of characters that form a signed real number.

V is an integer-type or real-type variable. If V is an integer-type variable, S must form a whole number.

Code is a variable of type Integer.

If the string is invalid, the index of the offending character is stored in Code; otherwise, Code is set to zero. For a null-terminated string, the error position returned in Code is one larger than the actual zero-based index of the character in error.

Val performs range checking differently depending upon the setting of the $R compiler directive and the type of the parameter V.