Hi,
I would like to know is it possible to use c++ code to control pc hardware?

what hardware are you referring to?

The short answer is "yes and no".

The C++ standard specifies no direct means of accessing hardware. However, with the help of non-standard techniques (which are operating system and hardware specific) it is possible to control hardware. Technically, those techniques are beyond scope of the C++ standard but, in practice, with support of suitable compilers and their libraries it is possible to find ways ....

Another question is which OS is in between you and the hardware.

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