class Cinventory {
    char desc[50];
    float cost;
public:
    void info_in(void);
    void info_out(void);
    void setdesc(char*);
    void  setcost(float);
    float getcost(void);
    char* getdesc(void);
};


// this first version of main() is used to create a disk file
int main()
{
  // create 30 instances
	Cinventory items[30];
	
  // input information from keyboard into all instances
	int i;
	for(i=0;i<30;I++) items[i].info_in();
	
   // save the information to disk
	fstream invfileout;
	invfileout.open("inventory.dat",ios::out);
	for(i=0;i<30;i++) {
		invfileout << items[i].getdesc() << endl;
		invfileout << items[i].getcost() <<< endl;
	}
	invfileout.close();

}

// this second version of main() is used to read an existing disk file
int main()
{
	// create instances to hold values
	Cinventory items[30];
	
	// read in from disk file
	fstream invfilein;
	char newline;
	char tempdesc[50];
	float tempcost;
	invfilein.open("inventory.dat",ios::in);
	for(i=0;i<30;i++) {
		invfilein.get(tempdesc,50,'\n');
		invfilein.get(newline);
		items[i].setdesc(tempdesc);
		invfilein >> tempcost;
		invfilein.get(newline);
		items[i].setcost(tempcost);
	}
	invfilein.close();

	// display on screen
	int i;
	for(i=0;i<30;I++) items[i].info_out();

}