Fraction Math

#include <iostream>
#include <math.h>
using namespace std;

int main()
{
int numeratorOne;
int denominatorOne;
int numeratorTwo;
int denominatorTwo;
int numeratorResult;
int denominatorResult;
int operation;


cout << "Enter the Numerator of the first fraction: ";
while(true)
{
    if(cin  >> numeratorOne)
    {
        break;
    }
    else
    {
        cin.clear();
        cin.ignore();
        cout << "Sorry I didn't get that, please enter the numerator of the first fraction: ";
    }
}

cout << "Enter Denominator of the first fraction: ";
while(true)
{
    if(cin >> denominatorOne)
    {
        if(denominatorOne == 0)
        {
            cout << "Sorry the denominator can not be zero, please enter a non-zero integer: ";
        }
        else
        {
            break;
        }
    }
    else
    {
        cin.clear();
        cin.ignore();
        cout << "Sorry I didn't get that, please enter the denominator of the first fraction: ";
    }
}

cout << "Enter the Numerator of the second fraction: ";
while(true)
{
    if(cin  >> numeratorTwo)
    {
        break;
    }
    else
    {
        cin.clear();
        cin.ignore();
        cout << "Sorry I didn't get that, please enter the numerator of the second fraction: ";
    }
}

cout << "Enter Denominator of the second fraction: ";
while(true)
{
    if(cin >> denominatorTwo)
    {
        if(denominatorTwo == 0)
        {
            cout << "Sorry the denominator can not be zero, please enter a non-zero integer: ";
        }
        else
        {
            break;
        }
    }
    else
    {
        cin.clear();
        cin.ignore();
        cout << "Sorry I didn't get that, please enter the denominator of the second fraction: ";
    }
}

cout << "Please select which operation you would like to do. "
     << "\n" << "1-Add"
     << "\n" << "2-Subtract"
     << "\n" << "3-Multiply"
     << "\n" << "4-Divide"
     << "\n" << "Select from the above list: ";

while(true)
{
    if(cin >> operation)
    {
        if(operation<1 || operation >4)
        {
            cout << "Sorry please select a number from 1-4: ";
        }
        else
        {
            break;
        }
    }
    else
    {
        cin.clear();
        cin.ignore();
        cout << "Sorry I didn't get that, please enter a number between 1-4: ";
    }
}

//Add
if (operation == 1)
{
numeratorResult = (numeratorOne * denominatorTwo + numeratorTwo * denominatorOne);
denominatorResult = (numeratorOne * denominatorTwo);
cout << numeratorOne << "/" << denominatorOne
     << " + "
     << numeratorTwo << "/" << denominatorTwo
     << " = "
     << numeratorResult << "/" << denominatorResult << "\n";
}

//Subtract
if (operation ==2)
{
numeratorResult = (numeratorOne * denominatorTwo - numeratorTwo * denominatorOne);
denominatorResult = (numeratorOne * denominatorTwo);
cout << numeratorOne << "/" << denominatorOne
     << " - "
     << numeratorTwo << "/" << denominatorTwo
     << " = "
     << numeratorResult << "/" << denominatorResult << "\n";
}

//Multiply
if(operation == 3)
{
numeratorResult = numeratorOne * numeratorTwo;
denominatorResult = denominatorOne * denominatorTwo;
cout << numeratorOne << "/" << denominatorOne
     << " x "
     << numeratorTwo << "/" << denominatorTwo
     << " = "
     << numeratorResult << "/" << denominatorResult << "\n";
}

//Divide
if(operation == 4)
{
numeratorResult = numeratorOne * denominatorTwo;
denominatorResult = denominatorOne * numeratorTwo;
cout << numeratorOne << "/" << denominatorOne
     << " / "
     << numeratorTwo << "/" << denominatorTwo
     << " = "
     << numeratorResult << "/" << denominatorResult << "\n";
}

system("PAUSE");

}