#include <iostream>

using namespace std;

void multiply(int atop, int abot, int btop, int bbot, int & rtop, int & rbot)
{ rtop = atop * btop;
  rbot = abot * bbot; }

void divide(int atop, int abot, int btop, int bbot, int & rtop, int & rbot)
{ rtop = atop * bbot;
  rbot = abot * btop; }

void add(int atop, int abot, int btop, int bbot, int & rtop, int & rbot)
{ rtop = atop * bbot + btop * abot;
  rbot = abot * bbot; }

void subtract(int atop, int abot, int btop, int bbot, int & rtop, int & rbot)
{ rtop = atop * bbot - btop * abot;
  rbot = abot * bbot; }

void test(int atop, int abot, int btop, int bbot)
{ int ctop, cbot;
  add(atop, abot, btop, bbot, ctop, cbot);
  cout << atop << "/" << abot << " + " << btop << "/" << bbot << " = " << ctop << "/" << cbot << "\n";
  subtract(atop, abot, btop, bbot, ctop, cbot);
  cout << atop << "/" << abot << " - " << btop << "/" << bbot << " = " << ctop << "/" << cbot << "\n";
  multiply(atop, abot, btop, bbot, ctop, cbot);
  cout << atop << "/" << abot << " * " << btop << "/" << bbot << " = " << ctop << "/" << cbot << "\n";
  divide(atop, abot, btop, bbot, ctop, cbot);
  cout << atop << "/" << abot << " / " << btop << "/" << bbot << " = " << ctop << "/" << cbot << "\n"; }

void ask(string prompt, int & top, int & bot)
{ cout << prompt << ", top then bottom: ";
  cin >> top >> bot; }

int main()
{ while (true)
  { int xtop, xbot, ytop, ybot;
    ask("X", xtop, xbot);
    ask("Y", ytop, ybot);
    test(xtop, xbot, ytop, ybot); } }