Pointers and arrays are ALMOST the same thing!

• ALMOST! ALMOST! ALMOST! ALMOST! ALMOST!
• An array can NEVER be a lvalue!!!!

A pointer pointing to one object is the same as one pointing to a group!

• A pointer may point to any array object or sub group.

       int *ptr, array[10];
  
       ptr = &array[3];       /* Point to the sub group starting at the 4th element! */
       ptr = array;           /* This is shorthand for ptr = &array[0] */
  

• You may add any integer expression to a pointer.
• The following pointer expressions are the same when ptr = array

      ptr[3];
      array[3];
      *(ptr + 3);
      *(array + 3);
      *(3 + ptr);
      *(3 + array);
      3[ptr];
      3[array];
  

• You may subtract two pointers of the same type so long as both point to objects in the same group.

      int x;
  
      ptr1 = &array[5];
      ptr2 = &array[7];
  
      x = ptr2 - ptr1;		/* x is 2. For all pointer types!!!!!!! */