Why we write #using namespace std# when we code in code blocks but not in Turbo C++

Answer 1

How about turbo function in c++?
Did you write
std::cout instead of cout?

Answer 2

@hdo good!

Answer 3

turbo c++ is an old/outdated compiler. namespace std is new feature of c++ standard (from c++98 if I remember correctly). You should use current IDEs with modern compilers implementing recent C++ standards. Some are visual c++ or code::blocks.

Answer 4

no just cout