//============================================================================
// Name        : Pointers.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
#include "Student.h"
#include <iostream>
using namespace std;

void fun1(int *q) {
	*q = 34;
}

int main() {
	int *g, *q;//example to show why pointers are dangerous
	g = new int;
	*g = 5;
	cout << g << " " <<*g << endl;
	delete g;//mark memory as unused
//	g = 0;//set g to null
	q = new int;//allocate new memory: this uses the same memory as g if g not set to null
	cout << q << " " << *q << endl;
	*q = 50;
	cout << *g << endl;
	*g = 10 - *q;
	cout << q << " " << *q << endl;
	//*g = 5;//illegal memory access
	//some older code, uncomment to see how it works...
	/*
	Student dru;
	dru.gpa = 4.0;
	cout << dru.gpa << endl;
	
	Student *studentPtr;
	studentPtr = &dru;
	(*studentPtr).gpa = 3.5;
	cout << dru.gpa << endl;
	
	studentPtr->gpa = 3.9;
	cout << studentPtr->gpa << endl;
	
	int x = 50;
	int *p;
	p = &x;
	
	cout << "X is: " << x << endl
	     << "Address of X: " << &x << endl
	     << "P is: " << p << endl
	     << "Address of P: " << &p << endl
	     << "Value of variable to which P is pointing: " << *p <<endl; // prints !!!Hello World!!!
	fun1(p);
	cout << "After function call..."<<endl;
	cout << "X is: " << x << endl
		     << "Address of X: " << &x << endl
		     << "P is: " << p << endl
		     << "Address of P: " << &p << endl
		     << "Value of variable to which P is pointing: " << *p <<endl; // prints !!!Hello World!!!
	*/
	
	return 0;
}