=== COMPILE PL0 ===
  0 PROGRAM EX01; 
  0 VAR A,B,C; 
  1 BEGIN 
  2   A:=88; 
  4  IF A#88 THEN 
  7   WRITE(A); 
 11 ELSE WRITE(A+1); 
 17 END. 
~~~ RUN PL0 ~~~
89
~~~ END PL0 ~~~