Reference and pointer differences in C + +

Reference and pointer differences :
1 The reference must be initialized, and the pointer can be initialized to null
2 references do not have their own memory; the pointer has memory
3 pointer can be changed to point, reference once point cannot be changed

4 references no const, pointers have const, but once const cannot be changed

5 sizeof pointer, get pointer to the size of the variable address, sizeof reference, get reference to the size of the variable;
Reference notes:
1 cannot initialize to NULL
2 no void type, no reference to array int & A[10]
3 references int &&a=b; without reference
4 no reference pointer int &*, but reference with pointer type

Reference and pointer differences in C + +