26. Pointers

• A variable that contains the address of another variable is called a pointer variable, or, simply, a pointer.

• Pointers are essential when manipulating arrays and other data structures in memory.

• High-level language s such C/C++ and Java purposely hide the implementations of pointers,
  because such details are not portable across different machine architectures.

• However, assembly language programmers deal with pointers at the physical level.