Difference between pointer and reference

[Chrisch]

Can nay one tell me what is the difference between (pointer and reference ) the entries below:

int  n3 = new int (13); 
and 
int * & n3 = new int (13);

thank you

[Zecho]

A reference can be thought of as a special type of pointer with certain restrictions. references have to be initialized at the time of declaration and cannot be changed in the code later , whereas this does'nt hold true with the pointers.Pointers and Reference looks similar but there are some difference between both of them.

[Walby]

Pointer maynot associate with a legitimate memory but refernces should associate with certain memory.A pointer can be re-assigned any number of times while a reference can not be reassigned after initialization. Reference cannot be changed whereas pointer value can be changed. Actually, const pointer = reference.A pointer can point to NULL while reference can never point to NULL.

[Aberto]

POINTER

int b = 11;

int *P = &b; //It is not necessary 

Another way is :

int b = 11;

int *q;
q = &b; 

 You can create the array of Pointer,assign NULL to the pointer like

int *q = NULL;

REFERENCE

int &b = 10;

int &b; 

int &b = NULL; //Error

 You can not use reference to reference.