// CS 211 Lab 8
//
//  Written by Pat Troy

// note the different names for the C libraries
#include <cstdio>     //  cstdio   instead of stdio.h
#include <cstdlib>    //  sstdlib  instead of stdlib.h

// a simple class to explore the ideas of:
//    data members
//    access modifiers of private, public
//    keyword static
class LabExample
{
  private:
     int storage;

  public:
     void setStorage (int s)
     {
       storage = s;
       // this->storage = s;
     }

     int getStorage ()
     {
       // return storage;
       return this->storage;
     }

     void modStorage ()
     {
       storage = storage * 2;
     }

     static void staticMethod ( )
     {
       printf ("Inside staticMethod()\n");

       // the following would cause an error if attempted
       // printf ("The value of storage is: %d\n", storage);
     }
};


int main ( int argc, char** argv)
{
  // create two instances of the above class
  LabExample inst1, inst2;                // LINE 1

  printf ("Inside main\n");

  inst1.setStorage (5);                   // LINE 2
  inst2.setStorage (1);                   // LINE 3

  printf ("inst1 contains: %d \n", inst1.getStorage() );     // LINE 4
  printf ("inst2 contains: %d \n", inst2.getStorage() );
  inst1.modStorage();
  inst1.modStorage();
  inst2.modStorage();
  printf ("inst1 now contains: %d \n", inst1.getStorage() );
  printf ("inst2 now contains: %d \n", inst2.getStorage() ); // LINE 5

  // repeat above with pointers to the above class
  LabExample  *ptr1, *ptr2;              // LINE 6

  // Use malloc to allocte heap memory and store address in pointers
  ptr1 = (LabExample*) malloc ( sizeof (LabExample) );   // LINE 7
  ptr2 = (LabExample*) malloc ( sizeof (LabExample) );   // LINE 8

  // must use -> instead of . since these are pointers
  ptr1->setStorage (15);                                     // LINE 9
  ptr2->setStorage (11);
  printf ("ptr1 contains: %d \n", ptr1->getStorage() );
  printf ("ptr2 contains: %d \n", ptr2->getStorage() );
  ptr1->modStorage();
  ptr1->modStorage();
  ptr2->modStorage();
  printf ("ptr1 now contains: %d \n", ptr1->getStorage() );
  printf ("ptr2 now contains: %d \n", ptr2->getStorage() ); // LINE 10

  // de-allocate the pointers
  free  (ptr1);     // Use free() when allocated with malloc()   LINE 11
  free  (ptr2);     // Use free() when allocated with malloc()   LINE 12

  // call the static method
  LabExample::staticMethod();          //   LINE 13

  printf ("End of main\n");

  return 1;
}