Exercise 1.6.1 : For the block-structured C code of Fig. 1.13(a), indicate the
values assigned to w, x, y, and z.
Ans.
w = 13, x = 11, y = 13, z = 11

Exercise 1.6.2 : Repeat Exercise 1.6.1 for the code of Fig. 1.13(b).
Ans.
w = 9, x = 7, y = 13, z = 11


Exercise 1.6.3 : For the block-structured code of Fig. 1.14, assuming the usual
static scoping of declarations, give the scope for each of the twelve declarations.
Ans.
-----------------------------------------------------
declaration           variable         scope
-----------------------------------------------------
int w, x, y, z;          w              B1 - B3 - B4
                         x              B1 - B2 - B4
                         y              B1 - B5
                         z              B1 - B2 - B5
int x, z;                x              B2 - B3
                         z              B2
int w, x;                w              B3
                         x              B3
int w, x;                w              B4
                         x              B4
int y, z;                y              B5
                         z              B5
-----------------------------------------------------

Exercise 1.6.4 : What is printed by the following C code?

Ans.
3
2