C++ find the values and size of the pointers?

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C++14

int * p = NULL; // the size of p is:________.
// the value of p is:___ ____

double * q=NULL; // the size of q is:__________
// the value of q is:________

char * t=NULL; // the size of t is:________,
// the value of t is:_______

p = &a; // the value of p is:_____________

q = &d; // the value of q is:_____________

t = &c; // the value of c is:_____________

cout << *p << endl; // This displays ______. When accessing *p, the following ___ number of bytes are accessed

cout << *q << endl; // This displays ______. When accessing *q, the following ___ number of bytes are accessed

cout << *t << endl; // This displays ______. When accessing *t, the following ___ number of bytes are accessed

cout << "p+1=" << p+1 << endl; // How much is p differs from p+1?______

cout << "q+1=" << q+1 << endl; // How much is q differs from q+1?______

cout << "t+1=" << t+1 << endl; // How much is t differs from t+1?______

What I have tried:

This is what I did so far, I'm not sure how to do the rest. I very new to c++. Any help would be appreciated.

int * p = NULL; // the size of p is:____8____.
// the value of p is:___ 0____

double * q=NULL; // the size of q is:_____8_____
// the value of q is:____0____

char * t=NULL; // the size of t is:____8____,
// the value of t is:____0___