C++ pointer

& is reference operator
* is deference operator

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int p=10; assuming p address is 1200.
so &p is 1200 and p is 10. In this case : & = address of

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POINTER

int * q
q = &p ==> q is containing address!
*q = 11 ==> *q is containing value, in this case : * = value pointed by

Important :
int * q and *q, those 2 * (stars) have diffrent meaning.
One is denotes a pointer (not variable nor constant value).
One is deference operator.

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End result : p is 11.

Excerpt from : http://www.cplusplus.com/doc/tutorial/pointers/