Add two pointers? (legal or illegal)

illegal ！

         A pointer is also an object , The properties related to pointers are 3 individual , Are the values of the pointer itself （value)、 The object that the pointer refers to （content） And the storage location of the pointer itself in memory （address). They mean, respectively :

         The value of the pointer itself is a memory address value , Indicates the storage address of the object referred to by the pointer in memory ;

         The object referred to by the pointer can be accessed through the dereference pointer ;

         Because the pointer is also an object , So the pointer is also stored somewhere in memory , It has its own address , That's why “ The pointer of the pointer ” Why .

From the above analysis, we know that , The value of the pointer is the memory address of the object it refers to , If we add two pointers together , Is trying to add the storage addresses of two objects in memory , This is obviously meaningless . By contrast , The subtraction of pointers is meaningful . If two pointers point to different elements in the same array , The result of their subtraction represents the distance of the elements they refer to in the array .