We can say that Pointer can be of any datatype and is not RESTRICTED to the size of that particular datatype. Pointer is a contains 4byte VARIABLE of address in a 32 bit computer are of 4 byte length. So what about 64 bit computers? Well in 64 bit computers the pointer size will vary, but if we rum a 32 bit pointer in 64 bit system then we will FIND half of the pointer's field is empty LIKE 0x000000.