#include <iostream>
using namespace std;

int main() {

	cout << "\tCalcul du milieu d'un segment grace aux coordonnees de ces extremites." << endl << endl;
	int Xa, Xb, Ya, Yb;
	cout << "Entrez l'abscisse Xa : ";
	cin >> Xa;
	cout << endl << "Entrez l'abscisse Xb : ";
	cin >> Xb;
	cout << endl << "Entrez l'ordonnee Ya : ";
	cin >> Ya;
	cout << endl << "Entrez l'ordonnee Yb : ";
	cin >> Yb;

	cout << endl << "\tMilieu : K(" << (Xa+Yb)/2 << "; " << (Xb+Ya)/2 << ")." << endl << endl;
system("PAUSE");
}