Why using namespace std; is used in dev c++not in turbo c++??

Question

c++

Answer 1

Turbo C++ has an older compiler that's why it does not support the "using namespace std".

Answer 2

Due to updation in the c++ by ANSI there are some changes in compiler too, so new complier has to follow the rule by ANSI so dev follow tge new rules whereas turbo use older one.