Help on parse (derivation) trees!..

[iopusstarr1]

I was given a question of the follwing:

 

Consider the Baby Programming Language (BPL). It is a very simple programming language,

whose syntax is given by the following grammar:

 

S → WHILE B DO S ENDWHILE; | SS | A | P

A → I := E;

I → char(char)٭

E → digit | E + E | I

P → PRINT I;

B → TRUE | FALSE | E == E

 

Give the parse (derivation) tree for :

WHILE 4==3 DO PRINT x; x:=4; ENDWHILE;

ex := 4;

 

I'm really stuck. Somebody help!