a. Is the following legal?

int a, b;

int* ptr;
int* ptrptr;
	
ptr = &a;
ptrptr = &ptr;

b. What about?

int a, b;

int* ptr;
int** ptrptr;

ptr = &a;
ptrptr = &ptr;

What is the value of:
c. ptr
d. *ptr
e. *ptrptr
f. *ptrptr == ptr
g. **ptrptr
h. ptrptr == ptr

Solution:
a. This won't compile because you the type of &ptr is a pointer to an int pointer where ptrptr is declared to be an int pointer.
b. Yes, this solves the problem above.  ptrptr is a pointer to an int pointer.
c. the address of a
d. the value of a, which currently is whatever was in the memory location where a resides
e. the address of ptr, that is where ptr is stored
f. 1 (true)
g. the value of a
h. won't compile (you're trying to compare an int** with an int*)