Consider the following program in a block-structured language.

The simplest symbol-table organization in such a situation is the

stack symbol table described in class.

program tst;

var

x, y, z: integer;

procedure P( x, y, z: integer);

var

a, b: integer;

begin (* P *)

...

end; (* P *)

procedure Q( n: integer);

procedure R( m, n: integer);

var

x, y: integer;

z: boolean;

begin (* R *)

...

end; (* *)

begin (* Q *)

...

P( 2*n, 5+n, n div 2)

...

end; (* Q *)

begin (* tst *)

...

Q( x + y*z);

...

end.

Assume that 'read', 'write', and 'abs', are the only predefined names.

a) Show the contents of the symbol table and the scope table (display)

prior to completing the compilation of procedure P.

b) Show the contents of the symbol table and display prior to

completing the compilation of procedure R.