3.16

#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;


float silnia(float s)
{
    if (s==0)
    {
        return 1;
    }
    else
        return silnia(s-1)*s;
}

float suma(float su)
{
    return ((su+1)*su)/2;
}

int main()
{
    srand(time(NULL));
    int x = 5+ rand()%6;
    cout<<"Liczba x: ";
    cout<<x;
    cout<<endl;

    int y;
    cout << "Podaj y: " ;
    cin>>y;

    while (y<=0)
        {
            cout<<"Podaj poprawne y!"<<endl;
            cout<<"Liczba y: ";
            cin>>y;
        }

    cout<<endl;
    cout<<endl;
    cout<<"Dzialanie to: \n"<<endl;
    cout<<x<<"! + "<<y<<"!"<<endl;

    for(int z=1;z<=2*y;z++)
    {
        cout<<"-";
    }
    cout<<endl;

    int n=1;
    while(n<=y)
    {
        if (n==y)
        {
            cout<<n<<endl;
            break;
        }
        cout<<n<<"+";
        n++;
    }


    float wynik;
    wynik=(silnia(x)+silnia(y))/suma(y);

    cout<<endl;
    cout<<"\na wynik to:  \n\n"<<wynik;
    cout<<endl;

    return 0;
}