Using new and delete

1.
   new <type>           e.g. new int
                             new person (if you've already defined a struct person)

   Finds enough memory to store one <type> (one int or one person)
   Returns a pointer to that memory.

   Example use:
      int * p = new int;
      person * q = new person;


2.
   new <type>[<number>]    e.g. new int[100];
                                new person[N];

   Finds enough memory for an array of <number> <type>s
   Returns a pointer to that memory.

   Example use:
      int * p = new int[100];
      person * q = new person[N];


3.
   delete <pointer>        e.g. delete p;

   Take back the memory that the pointer points to;
   recycle it so that it can be used again for something else.
   the pointer must have been created using the first form of new.


4.
   delete[] <pointer>        e.g. delete[] p;

   Take back the memory that the pointer points to;
   recycle it so that it can be used again for something else.
   the pointer must have been created using the second form of new.