**a. px is the pointer to x**

** *px dereferences this pointer, giving us
10 (= the value x)**

** (*px)++ is 10 + 1, which is 11**

** so x = 11, but since this is a post-fix
operation, z is still 10**

** **

**b. *py dereferences the pointer py, giving us
20 (= the value of y)**

** *py + y is 20 + 20, which is 40**

** so z = 40**

** **

**c. x and y are integers, and an int cannot be
dereferenced.**

** **