For the following C code, fill in the value of each variable at the given point in the code. If the value of the variable cannot be determined at a given point in the code, write unknown. If the value is an address, write "address of $"($Hint: There is only one unknown value in this code.$)$

int w $=0,*$x $=$ &w$,$ y $=0$;

$//$ part a

w $=5$;

y $=-1$;

$//$ part b

x $=$ &y;

y $=10$;

w $=$ y $+*$x;

$//$ part c

x$++$;

y$++$;

$//$ part d

Type int int pointer $($deref$\text{'}$d$)$ int pointer int

w $*$x x y

Value at a

Value at b

Value at c

Value d