Capinski ulamki dodawanie/od/mn/dz VS

#include <iostream>
using namespace std;

//int NWDr(int a, int b) {
//  int r;
//  while (b != 0) {
//      r = a % b;
//      a = b;
//      b = r;
//  }
//  return a;
//}

//int NWDrr(int a, int b){
//  if (b == 0) return a;
//  return NWDrr(b, a % b);
//
//}

int NWDo(int a, int b) {
    while (a != b) {
        if (a > b) a -= b;
        else b -= a;
    }
    return a;
}

int NWW(int a, int b) {
    return a * b / NWDo(a, b);
}

//int NWDor(int a, int b) {
//  if (a == b) return a;
//  if (a > b) return NWDor(a - b, b);
//  return NWDor(a, b - a);
//}

int main()
{
    //cout << NWDo(12,18) << endl;
    //cout << NWW(12, 18) << endl;


    // skracanie ulamkow
    int n1, d1, n2, d2, ns1, ns2, ds1, ds2;
    cout << "Wpisz licznik pierwszego ulamka: ";
    cin >> n1;
    cout << "Wpisz mianownik pierwszego ulamka: ";
    cin >> d1;


    ns1 = n1 / NWDo(n1, d1);
    ds1 = d1 / NWDo(n1, d1);
    cout << "\nSkrocony zapis ulamka pierwszego to: " << ns1 << "/" << ds1 << endl;

    cout << "Wpisz licznik drugiego ulamka: ";
    cin >> n2;
    cout << "Wpisz mianownik drugiego ulamka: ";
    cin >> d2;
    ns2 = n2 / NWDo(n2, d2);
    ds2 = d2 / NWDo(n2, d2);
    cout << "\nSkrocony zapis ulamka pierwszego to: " << ns2 << "/" << ds2 << endl;


    // wspolny mianownik
    int cd = NWW (ds1,ds2); // - common denominator


    // dodawanie ulamkow
    cout << "\n______________________________________________________" << endl;
    cout << "Dodawanie ulamkow:" << endl;
    int nv1, nr1, nr2;
    nr1 = cd / ds1 * ns1;
    nr2 = cd / ds2 * ns2;
    nv1 = nr1 + nr2;

    cout << "\n\nWynik: " << ns1 << " / " << ds1 << " + " << ns2 << " / " << ds2 << " = " << nv1 << " / " << cd<<endl;

    //calosci
    int rn, divn;
    divn = nv1 / cd;
    rn = nv1 % cd;

    if (divn != 0) {
        if (rn != 0) cout << "Co jest rowne: " << divn << " i " << rn << " / " << cd << endl;
        else cout << "Co jest rowne: " << divn << endl;
    }
    else {
        cout << "Co jest rowne: " << " i " << rn << " / " << cd << endl;
    }

    // odejmowanie ulamkow
    cout << "\n______________________________________________________" << endl;
    cout << "Odejmowanie ulamkow:" << endl;
    int nv2;
    nv2 = nr1 - nr2;
    cout << "\n\nWynik: " << ns1 << " / " << ds1 << " - " << ns2 << " / " << ds2 << " = " << nv2 << " / " << cd << endl;

    //calosci
    divn = nv2 / cd;
    rn = nv2 % cd;
    if (divn != 0) {
        if (rn != 0) cout << "Co jest rowne: " << divn << " i " << rn << " / " << cd << endl;
        else cout << "Co jest rowne: " << divn << endl;
    }
    else {
        cout << "Co jest rowne: " << rn << " / " << cd << endl;
    }

    // mnozenie ulamkow
    cout << "\n______________________________________________________" << endl;
    cout << "Mnozenie ulamkow:" << endl;

    int nv3, nv3s, dv3, dv3s;
    nv3 = ns1 * ns2;
    dv3 = ds1 * ds2;
    // skracanie
    nv3s = nv3 / NWDo(nv3, dv3);
    dv3s = dv3 / NWDo(nv3, dv3);
    cout << "\n\nWynik: " << ns1 << " / " << ds1 << " * " << ns2 << " / " << ds2 << " = " << nv3 << " / " << dv3 << " = " << nv3s << " / " << dv3s << endl;

    // calosci
    divn = nv3s / dv3s;
    rn = nv3s % dv3s;
    if (divn != 0) {
        if (rn != 0) cout << "Co jest rowne: " << divn << " i " << rn << " / " << dv3s << endl;
        else cout << "Co jest rowne: " << divn << endl;
    }
    else {
        cout << "Co jest rowne: " << rn << " / " << dv3s << endl;
    }

    // dzielenie ulamkow
    cout << "\n______________________________________________________" << endl;
    cout << "Dzielenie ulamkow:" << endl;

    int nv4, nv4s, dv4, dv4s;
    nv4 = ns1 * ds2;
    dv4 = ns2 * ds1;
    // skracanie
    nv4s = nv4 / NWDo(nv4, dv4);
    dv4s = dv4 / NWDo(nv4, dv4);
    cout << "\n\nWynik: " << ns1 << " / " << ds1 << " / " << ns2 << " / " << ds2 << " = " << nv4 << " / " << dv4 << " = " << nv4s << " / " << dv4s << endl;

    // calosci
    divn = nv4s / dv4s;
    rn = nv4s % dv4s;
    if (divn != 0) {
        if (rn != 0) cout << "Co jest rowne: " << divn << " i " << rn << " / " << dv4s << endl;
        else cout << "Co jest rowne: " << divn << endl;
    }
    else {
        cout << "Co jest rowne: " << rn << " / " << dv4s << endl;
    }

    return 0;
}