this is code:
here i must write both #include <iostream> and using namespace std; i don't understand why such a expression we need.Where is cout?Is it in iostream or std?Code:#include <iostream> using namespace std; int main() { cout<<"Hello world"; return 0; }
Also said that iostream library is part of std.So why do we write include file.Also if std cover iostream why don't we write first
using namespace std;
then #include <iostream>
I don't understand relationship between two expression.
Any help will be greatly appreciated