10. Pointer summary

• An address &x tells where the variable is located in memory.

• Pointer points to a variable by remembering its address:

  • ptr = &x;

• Pointers are variables and must be declared:

  
      double* d_ptr;
  
  

  Here, asterisk * identifies d_ptr as a pointer variable.

• The phrase "variable pointed to by pointer ptr" is translated into C++ as

  • *ptr

  where * is the dereference operator.