Can we use iostream.h

Answer 1

You should not use iostream.h in c++ because that header doesn't exist in standard C++. It was part of some pre-1990s compilers, but it is certainly not part of C++.

Use #include <iostream> instead. And all the library classes are in the std:: namespace, for ex­am­ple std::cout.

Answer 2

Martin Taylor yup. you did