What is the difference between #include<iostream.h> & #include<iostream> using namespace syd; ?

Question

C++ pre processor directives

Answer 1

Ya
" #include<iostream>
using namespace std; "
it is used to remove scope resolution (::) in the program. if there is no "using namespace STD" in program you have to use STD::COUT<<"HELLO" and if there is "using namespace std " in program then you have to use only COUT<<"Hello"

Answer 2

Thanks bud

Answer 3

All these headers, that have no ".h" prefix, are from modern C++ standard library. But those with it are left there for compatibility with older C++ library standard and you shouldn't use them normally.