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FractionBinaryFile.cpp

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+#include <iostream>
+#include <fstream>
+using namespace std;
+
+int ncd(int a, int b) {
+	return (b == 0 ? a : ncd(b, a % b));
+}
+
+struct Drib {
+	int ch;
+	int zn;
+
+	void init() {
+		cout << "\nInput ch: ";
+		cin >> ch;
+		cout << "Input zn: ";
+		cin >> zn;
+		skor();
+	}
+	void skor() {
+		int d = ncd(ch, zn);
+		if (d != 0) {
+			ch /= d;
+			zn /= d;
+		}
+	}
+	void print() {
+		cout << ch << "/" << zn << endl;
+	}
+
+};
+int main()
+{
+	Drib a;
+	Drib* pDrip = new Drib;
+	fstream finOut;
+
+	finOut.open("info.dat", ios::binary | ios::out);//ios::out|ios::trunc);
+	if (!finOut.is_open()) {
+		cerr << "\n Error opening file(out)!!\n";
+		system("pause");
+		return 1;
+	}
+	int vUser;
+	do {
+
+		a.init();
+		pDrip->init();
+		finOut.write((char*)pDrip, sizeof(Drib));
+		//finOut.write(reinterpret_cast<char*>(&a), sizeof(a));
+		finOut.write((char*)(&a), sizeof(Drib));
+		cout << "\n Create a fraction?(1/Yes  0/No) ";
+		cin >> vUser;
+	} while (vUser);
+	finOut.close();
+
+	/*ifstream fIn;
+	finOut.open("info.dat", ios::binary );*/
+
+	finOut.open("info.dat", ios::binary | ios::in);
+	if (!finOut.is_open()) {
+		cerr << "\n Beda(in)!!";
+		system("pause");
+		return 1;
+	}
+	cout << "\nRead fractions in file:\n";
+	finOut.read((char*)(&a), sizeof(a));//1 Drip
+	while (finOut.good()) {//!finOut.eof()
+		a.print();
+		finOut.read(reinterpret_cast<char*>(&a), sizeof(a));
+	}
+	finOut.close();
+	system("pause");
+	Drib* p;
+	finOut.open("info.dat", ios::binary | ios::in);
+	if (!finOut.is_open()) {
+		cerr << "\n Error opening file(in)!!";
+		system("pause");
+		return 1;
+	}
+	finOut.seekg(0, ios::end);//ios::beg ios::cur
+	int endpos = (int)finOut.tellg();
+	int n = endpos / sizeof(Drib);
+	cout << "\n There are  " << n << " fractions in the file\n";
+	if (n == 0) {
+		return 0;
+	}
+	finOut.seekg(0);//finOut.seekg(0, ios::beg);
+	p = new Drib[n];
+	int i = 0;
+	for (i = 0; i < n; ++i) {
+		finOut.read(reinterpret_cast<char*>(p + i), sizeof(Drib));
+	}
+
+	cout << "Counted " << i << " fractions\n";
+	for (i = 0; i < n; ++i) {
+		p[i].print();
+
+	}
+
+	//finOut.seekg(sizeof(drob)*(n-1));
+	finOut.seekg(-(streamoff)sizeof(Drib), ios::end);
+	finOut.read(reinterpret_cast<char*>(&a), sizeof(Drib));
+	cout << "\n The last fraction:\n";
+	a.print();
+	delete[] p;
+	finOut.close();
+	a.init();
+	finOut.open("info.dat", ios::binary | ios::app);
+	finOut.write((char*)(&a), sizeof(a));
+	//finOut.seekp(0, ios::end);
+	endpos = (int)finOut.tellp();
+	n = endpos / sizeof(Drib);
+	cout << "\n There are  " << n << " fractions in the file\n";
+	finOut.close();
+	finOut.open("info.dat", ios::binary | ios::in);
+	if (!finOut.is_open()) {
+		cerr << "\n Error: bad open file(in)!!";
+		system("pause");
+		return 1;
+	}
+	finOut.seekg(-(streamoff)sizeof(Drib), ios::end);
+	finOut.read(reinterpret_cast<char*>(&a), sizeof(Drib));
+	cout << "\n The last fraction:\n";
+	a.print();
+}
+