Dev - C++ - simplificar una fracción sin funciones

#include <iostream>

using namespace std;

int main()

 {

    int n, d;

    cout << "\nNumerador: "; cin >> n;

    cout << "Denominador: "; cin >> d;

    cout << endl << n << "/" << d;

    int k = 2;

    while (k <= 7)

    {

        if (n % k == 0 && d % k == 0)

         {

             n /= k;

             d /= k;

             cout << " = " << n << "/" << d;

             k = 2;

             continue;

         }

         k++;

    }

    cout << endl;

    return 0;

 }

#include <iostream>

using namespace std;

int mcd(int a,int b);

int main() {

  int n1,n2,r;

  int x,y;

  cout << "numerador: ";

  cin >> n1;

  cout << "Denominador: ";

  cin >> n2;

  r = mcd(n1,n2);

  x = n1 / r;

  y = n2 / r;

  //fraccion simplificada

  cout << "\nFraccion simplificada" << endl;

  cout << x << "/" << y << endl;

  return 0;

}

//Funcion Maximo comun Divisor

int mcd(int a,int b) {

    while (a != b) {

    if (a > b)

      a = a - b;

    else

      b = b - a;

  }

  return a;

}