#include <iostream>
using namespace std;

#include "Student.h"

int main()
{
 // automatic memory allocation
 //    (allocated on the runtime stack)
 int x = 5;
 double y;

 while ( x > 0 )
 {
   // static memory allocation
   //   (variables are not eliminated when they go out scope)
   //   (and they instead retain their values)
   static bool first_time = true;
   if ( first_time ) {
     cout << "first time through the loop, x is " << x << '\n';
     first_time = false;
   }
   x--;
 }

 // dynamic memory allocation (allocated on the runtime heap)
 //   (use the "new" keyword)
 int * p = new int;
 *p = 400;
 cout << "p points to an int with value " << *p << '\n';

 int * q = new int;
 *q = *p;
 *p = 500;
 cout << "p points to " << *p << " and q points to " << *q << '\n';

 delete p;   // relinquish that memory
 delete q;

 // new scope....
 {
   double * p = new double;
   *p = 35.1;
   double * q = p;
   cout << *p << " and " << *q << '\n';
   p = new double;
   *p = 27.1;
   cout << *p << " and " << *q << '\n';
   *q = 12.5;
   cout << *p << " and " << *q << '\n';
   delete p;
   delete q;
   cout << *p << " and " << *q << '\n';
   double * r = new double;
   *r = 48.6;
   cout << *p << " and " << *q << '\n';
 }


 // also declare arrays dynamically
 int n = 500;
 double * a = new double[n];   // (1) Allocate memory

 // do something with a ... use *a or a[i]    (2) use memory
 a[10] = 3.14;
 *(a+10) = 3.14;

 delete [] a;    // (3) Deallocate memory


//  Student * students = new Student[n];  // requires default constructor

 // do stuff with those 500 objects....

//  delete [] students;


 return 0;
}