Fun with Pointers I

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

#include "stdafx.h"
#include <iostream>

using std::cout;
using std::endl;
using std::end;

struct time 
{ 
	int hour;    
	int minute;    
	int second; 
};

void	handleTime(time tt)
{
	tt.hour++;
}

void	handleTime(time& tt, int amt)
{
	tt.hour += amt;
}

void	handleTime(time *tt)
{
	tt->hour++;
}


void	f2(int *pp)
{
	cout << "f2::xp = " << *pp << endl;

	(*pp)++;
}

void	f1(int *pp)
{
	cout << "f1::xp = " << *pp << endl;

	f2(pp);

	(*pp)++;
}

int *	f4()
{
	int x = 45;

	return &x;
}

int *	f3()
{
	int *xp = f4();

	return xp;
}

int gx = 99;

int *	f6()
{
	++gx;
	return &gx;
}

int *	f5()
{
	int *xp = f6();
	++(*xp);
	return xp;
}

void	funWithLocalArray()
{
	char msg[] = "Selvyn Wright";

	char *cptr = msg;

	for (int idx = 0; msg[idx] != NULL; ++idx)
		cout << msg[idx];
	cout << endl;

	while (*cptr)
		cout << *cptr++;
	cout << endl;

	cptr = msg;
	char c = *cptr;
	while (c)
	{
		cout << c;
		cptr++;
		c = *cptr;
	}

	cout << endl;
}

void	pointerArithmetic()
{
	char msg[] = "Selvyn Wright";
	int  intarray[] = { 11, 22, 33, 44, 55 };
	double dblArray[] = { 11.11, 22.22, 33.33, 44.44, 55.55 };

	char *cptr = msg;
	++cptr;

	int *iptr = intarray;
	*(iptr + 2);
	iptr[2];

	double *dptr = dblArray;
	++dptr;
}

int main()
{
	int x = 45;
	int *xp;

	xp = &x;

	cout << "Pre::xp = " << x << endl;
	f1(xp);
	cout << "Post::xp = " << x << endl;

	xp = f3();

	int y = 33;
	f1(&y);
	cout << "Data from f4 = " << *xp << endl;

	xp = f5();

	int z = 33;
	f1(&z);
	cout << "Data from f6 = " << *xp << endl;

	funWithLocalArray();

	pointerArithmetic();

	time myTime = { 12, 3, 1 };
	time *tptr = &myTime;

	handleTime(myTime);

	handleTime(myTime, 1);

	handleTime(tptr);

	handleTime(*tptr, 1);

	return 0;
}