Const Pointer Demo and Notes

ConstPointer.cpp

// Const.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
using namespace std;

class Person
{
private:
	string firstName;
	string lastName;
	int arbitraryNumber;
public:
	Person(string n, string l, int num) : firstName(n), lastName(l), arbitraryNumber(num){}
	~Person(){}
	string GetName() const { return firstName + " " + lastName + " "; }
	int GetNumber() const { return arbitraryNumber; }
	void SetNumber(int in) { arbitraryNumber = in; }
	bool operator<(const Person &p) const{ return arbitraryNumber < p.arbitraryNumber; }
	bool operator<(int i) const { return arbitraryNumber < i; }
	friend bool operator<(int i, const Person &p);
};

bool operator<(int i, const Person &p) { return i < p.arbitraryNumber; }

int DoubleIt(const int &x)
{
	return x * 2;
}


int _tmain(int argc, _TCHAR* argv[])
{
	int i = 3;
	const int ci = 3;
	i = 4;
	//ci = 4

	int j = 10;
	int DoubleJ = DoubleIt(j);
	int doubleTen = DoubleIt(10);

	Person Kate("Kate", "Gregory", 234);
	Kate.SetNumber(235);
	const Person cKate = Kate;
	//cKate.SetNumber(236);
	int KateNumber = cKate.GetNumber();

	int* pI = &i;
	//int *pII = &ci;
	const int *pII = &ci;

	Person *pKat = &Kate;
	Person Someone("Someone", "Else", 345);

	const int *pcI = pI;	// pointer to CONSTANT VALUE
	//*pcI = 4;
	pcI = &j;

	int * const cpI = pI;	// const pointer :CONSTANT POINTER
	*cpI = 4;
	//cpI = &j;


	const int * const madPointer = pI;
	//madPointer = &j;		// pointer cant be changed
	//*madPointer = 234;	// content cant be changed
	int k = *madPointer;

	return 0;
}