Ajutor in CodeBlocks, factorialul in c++

1.
#include <iostream>
using namespace std;
int main()
{
int n, p = 1;
cin >> n;
for (int i = 1; i <= n; i++)
{
p *= n;
}
cout << p;
return 0;
}
2.
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int n;
cin >> n;
cout << pow(2, n);
return 0;
}