difference between where you put pointer astreix c++ code example

Example: difference between pointer and reference in c++

Pointers: 
A pointer is a variable that holds memory address of another variable. 
A pointer needs to be dereferenced with * operator to access the 
memory location it points to. 

References :
 A reference variable is an alias, that is, 
another name for an already existing variable.
 A reference, like a pointer, is also implemented 
by storing the address of an object.