Write a program in C++ to find the factorial of a number

#include <iostream>
using namespace std;
int main()
{
    int num1,factorial=1;
    cout << "\n\n Find the factorial of a number:\n";
	cout << "------------------------------------\n";
	cout << " Input a number to find the factorial: ";
	cin>> num1;
    for(int a=1;a<=num1;a++)
    {
        factorial=factorial*a;
    }
	cout<<" The factorial of the given number is: "<<factorial<<endl;
    return 0;
}