Can i replace this with just this

Hello friends,
I am new to c++ and was studying the code of a bank record system

where
they have used

Code:

---

#include<iostream>#include<fstream>
#include<cstdlib>
using std::cout;
using std::cin;
using std::endl;
using std::fstream;
using std::ofstream;
using std::ifstream;
using std::ios;

---

can i just use in place of that? or i am missing something?

Code:

---

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

---

Yes, you can, but you may end up injecting more unqualified names into the scope than you expect, so you shouldn't unless you know what you're doing.