valid and invalid pointer arithmetic

Valid pointer arithmetic

Pointer address + Number = address
Pointer address - Number = address
Pointer address - Number = address

invalid pointer arithmetic

Pointer address + Pointer address  = Illegal

Pointer address * Pointer address  = Illegal

Pointer address / Pointer address  = Illegal

Pointer address % Pointer address  = Illegal

Pointer address & Pointer address  = Illegal

Pointer address | Pointer address  = Illegal

Pointer address ^ Pointer address  = Illegal

~ Pointer address  = Illegal

Reference:

http://www.c4learn.com/c-programming/c-pointer-invalid-operations/

http://www.c4learn.com/c-programming/c-pointer-arithmetic-operations/