stdio.h not standard in C++?

Question

I know most compilers allow both:

#include 

//and

#include 

But someone argu

Answer 1

The C standard headers are included in the C++ standard library for compatibility.

The difference is that identifiers in corresponding C++ headers must (also) be in std namespace, whereas identifiers in C headers must (also) be available in global namespace.

In addition, the headers add overloads for functions like abs, pow etc.

Also, C++ headers replace some C classification/comparison macros with overloaded functions.