A Basic Pointer Example

//*****************************************************************
//   In this example we introcuce pointer concept. It does not 
//explain everything but it is rather an introduction
//*****************************************************************
#include <cstdlib>
#include <iostream>
using namespace std;
// A method by using concept of pointer
int square(int *haha);
int main(int argc, char *argv[])
{
    // Simply pointers
    int num1 = 5;
    int *num2;//num2 is a pointer decleration
    //It is not a number but it is an adress of number
    //As the name implies it points the number which we want
    num2 = &num1;//num2 holds an adress thus we give the num1's
    // adress to the num2
    cout<<"num1 is "<<*num2<<endl;
    cout<<"If use it in a method "<<endl;
    cout<<"The square of num1 is "<<square(&num1)<<endl;
    cout<<"The num1 is "<<num1<<endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}
int square(int *haha){
    *haha = *haha * *haha;
    return *haha;    
}