Factorial-1,2.cpp

#include <iostream>
int fact_rec(int);
int fact(int);
using namespace std;
int main()
{
    int op, n, f;
    cout << "Factorial in 2 Methods:" << endl
         << "1.Recurssion,\t2.Normal" << endl
         << "Choose Your Option:";
    cin >> op;
    switch (op)
    {
    case 1:
        cout << "Enter Number:" << endl;
        cin >> n;
        f = fact_rec(n);
        break;
    case 2:
        cout << "Enter Number:" << endl;
        cin >> n;
        f = fact(n);
        break;
    default:
        cout << "WRONG OPTION!!!" << endl;
        system("cls");
        main();
    }
    cout << "Factorial of"
         << "\t" << n << "\t" << f << endl;
    return 0;
}
int fact_rec(int n)
{
    if (n == 1 || n == 0)
    {
        return 1;
    }
    else
    {
        return n * fact_rec(n - 1);
    }
}
int fact(int n)
{
    int i, f = 1;
    for (i = 1; i <= n; i++)
    {
        f = f * i;
    }
    return f;
}
int main()
{
    int n = 5, i, j, sum = 0;
    for (i = 1; i <= n; i++)
    {
        for (j = 1; j <= n; j++)
        {
            sum = sum + j;
        }
    }
    std::cout << sum;
}