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C++ Primer (Pointers (Important operators (de-reference(*) (We use the de…

- - - - :red_flag: int*p,d,a; //Really declares one pointer and TWO INTS
  - - - Since pointers store addresses we commonly use the address operator
        
        int * p;
        int x=9;
        p=&x; //p is assigned the address of x
        
        string hi="hello";
        char foo=&hi[0]; \If address of 'h' is 1702 then ptr is set to 1702
        char h=foo; \*foo is the same as what's inside the address
        //h='h';
    - - We use the de-reference operator to access the value of a pointer
        
        double ptr;
        double pi=3.14;
        ptr=π //ptr is assigned the address of pi
        double pie=ptr; //pie is now set to 3.14
      - :red_flag: Although we use the same sign to declare an array they mean something completely different after a pointer is declared
    - - Allows a shortcut to access members
        
        pointer name->member is equivalent to (*pointer name).member
- - - - We must check if we have enough memory free to do what we want
    - - We need to release the memory when we're done
        
        delete p; //destroys the object p points to
        
        delete [] p; //deletes a pointer of array
    - - Is a keyword that allocates the right amount of memory and returns a pointer to the start of the memory