How to find factorial of N?

CODE

How to find factorial of N?

//Write a program to find factorial of N…

#include<iostream>

using namespace std;

class fact

{

    int n,i,f=1;

public:

    void input()

    {

        cout<<"enter N:";

        cin>>n;

    }

    void pro()

    {

        for(i=1;i<=n;i++)

        {

            f=f*i;

        }

    }

    void out()

    {

        cout<<"\n factorial:"<<f;

    }

};

int main()

{

    fact obj;

    obj.input();

    obj.pro();

    obj.out();

}

Output:

enter N:5

 factorial:120