Program bug0152;

{
  Shows wrong evaluation of loop boundaries. First end boundary must
  be calculated, only then Loop variable should be initialized.
  Change loop variable to J to see what should be the correct output.
}

PROCEDURE LGrow(VAR S : String;C:CHAR;Count:WORD);
  
 VAR  I,J :WORD;
    
BEGIN
  I:=ORD(S[0]);           { Keeping length in local data eases optimalisations}
  IF I<Count THEN
     BEGIN
     Move(S[1],S[Count-I+1],I);
     FOR I:=1 TO Count-I DO
       S[I]:=C;
     S[0]:=CHR(Count);
     END;
END;
 
Var S : string; 
                                 
begin
  s:='abcedfghij';
  writeln ('s : ',s);
  lgrow (s,'1',17);  
  writeln ('S : ',s);
end.