For the declaration:

int a = 5;
int *ptr = &a;

what are the values of the following?

a. ptr
b. *ptr
c. ptr == a
d. ptr == &a
e. &ptr
f. *a
g. *&a
h **&ptr

Solution:
a. 0xbffff9fc (the address of a, notice that it's a large number, that is, on the call-stack)
b. 5 (the value that ptr points to)
c. won't compile, since you're trying to compare a ptr and an int, but would be false if it did compile
d. 1 (true)
e. 0xbffff9f8 (the address of the pointer)
f. won't compile, since a is an int and not a pointer, we can't dereference it
g. 5 (&a is the address of a and then * dereferences is again, giving us the original value)
h. 5 (&ptr is the address of the pointer, * dereferences that to give us the pointer again, and the second * dereference the pointer to give us the value that it points at)