Examples

    IF x > 10 THEN y := 4           IF x > 10 THEN BEGIN y := 4;
              ELSE y := 5;                               z := 5;
                                                   END
                                              ELSE y := 5;


 The ELSE clause always modifies the closest IF-THEN statement.

 Use caution to avoid logic errors in nested IF statements, as in
 the following:

    IF A = 1 THEN    {First IF}
       IF B<>1 THEN  {Second IF}
          C := 1
    ELSE             {Appears to modify first IF}
       C := 0;       {Actually modifies second IF}