#include <iostream>

using namespace std;


int factorielle(int n)
{
        int res=1;
        int i;
        
        for(i=1;i<=n;i++)
        {
                res = res * i;
        }

        return res;
}

void saisie(int &n, int &p)
{
        do
        {
                cout << "Veuillez saisir N : ";
                cin >> n;
                cout << "Veuillez saisir P : ";
                cin >> p;        
        
        } while (!(n>=p && p>=0));
}

int main()
{
        char reponse;
        float resultat;
        int N, P;
        
        cout << "Ce programme calcule le coefficient binomial Cnp assurance !!" << endl;
        do
        {
                        
                saisie(N,P);
                
                resultat = factorielle(N)/(factorielle(P)*factorielle(N-P));
                cout << "Le coefficient binomial("<< N << "," << P << ") vache "<<resultat<<endl;
  
                cout << "Voulez vous recommencez ? (O/N)";
                cin >> reponse;
        }while (reponse != 'N');
}