#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;
    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();

        finOut.write((char*)(&a), sizeof(Drib));
        cout << "\n Create a fraction?(1/Yes 0/No) ";
        cin >> vUser;
    } while (vUser);
    finOut.close();

    finOut.open("info.dat", ios::binary | ios::in);
    if (!finOut.is_open()) {
        cerr << "\n Beta(in)!!\n";
        system("pause");
        return 1;
    }
    cout << "\nRead fractions in file:\n";
    finOut.read((char*)(&a), sizeof(a));
    while (finOut.good()) {
        a.print();
        finOut.read(reinterpret_cast<char*>(&a), sizeof(a));
    }
    finOut.close();
    system("pause");
}