Tutoring: sample of how to various ways use pointers.

pointers.cpp

#include <iostream>
#include <string>

using namespace std;


void appendAuthorName(string* bookTitle){
	*bookTitle = *bookTitle + ": by J.K. Rowling"; // notice how I am modifying bookTitle but not returning anything. I am modifying the string directly
}

int main(){

	string* novel=new string("The Sound and the Fury"); // this does 2 things. 1-creates a new pointer, 2- places the string 'The Sound and the Fury' on the memory heap

	cout << novel << endl;  // This prints the memory address of the pointer

	cout << *novel << endl;  //This prints the string "The Sound and the Fury". Using *novel is called dereferencing a pointer.

	delete novel; // This deletes the string "The Sound and the Fury" from the heap, but does not delete the pointer itself.

	novel = new string("Harry Potter and the Sorcerer's Stone");

	cout << *novel << endl;  // Notice how I can still use the pointer (novel) by reassigning it to a new string

	delete novel;

	string sequel="Harry Potter and the Chamber of Secrets"; // This creates a string on the stack (not the heap)


	novel = &sequel; // Using &sequel returns the memory location of sequel. Now novel is assigned to the location of sequel;

	cout << novel << endl;  //
	cout << &sequel << endl; // These two lines should print the same thing

	cout << *novel << endl; // Prints the value of sequel ('Harry Potter and the Chamber of Secrets')

	appendAuthorName(novel);

	cout << * novel << endl; // Notice how novel is now different, even though appendAuthorName does not return a string.


	return 0;
}