Binary File

#include<iostream>
#include<fstream>
using namespace std;

/* Structure in C++ */
struct itemList {
	int item_no;
	string name;
	float price;
};

int main() {
	/* Opne binary file for write */
	ofstream wfile("info.dat", ios::out | ios::binary);

	/* Check error in file opening */
	if(!wfile) {
		cout << "Cannot open file!" << endl;
		return 1;
	}
	
	itemList wlists[3];

	wlists[0].item_no = 1;
	wlists[0].name = "Book";
	wlists[0].price = 150.50;
	
	wlists[1].item_no = 2;
	wlists[1].name = "Pen";
	wlists[1].price = 15.53;

	wlists[2].item_no = 3;
	wlists[2].name = "Pencil";
	wlists[2].price = 10.53;
	
	/* Write binary data using 'write()' */
	for(int i = 0; i < 3; i++)
	    wfile.write((char *) &wlists[i], sizeof(itemList));

	/* Close file for writing */
	wfile.close();

	/* Check file condition */
	if(!wfile.good()) {
		cout << "Error occurred at writing time!" << endl;
		return 1;
	}

	/* Open binary file for read */
	ifstream rfile("info.dat", ios::in | ios::binary);

	/* Check error in file opening */
	if(!rfile) {
		cout << "Cannot open file!" << endl;
		return 1;
	}
	
	itemList rlists[3];

	/* Read binary data using 'read()' */
	for(int i = 0; i < 3; i++)
	    rfile.read((char *) &rlists[i], sizeof(itemList));

	/* Close file for reading */
	rfile.close();

	/* Check file condition */
	if(!rfile.good()) {
		cout << "Error occurred at reading time!" << endl;
		return 1;
	}

	for(int i=0; i < 3; i++) {
		cout << "Item No: " << rlists[i].item_no << endl;
		cout << "Name: " << rlists[i].name << endl;
		cout << "Price: " << rlists[i].price << endl;
		cout << endl;
	}
	
	return 0;
}


/* Output */
Item No: 1
Name: Book
Price: 150.5


Item No: 2
Name: Pen
Price: 15.53


Item No: 3
Name: Pencil
Price: 10.53