How do I connect c++ to other accessories like a light bulb

Question

I would like to program a light on and of by typing "on" or "off" in cin

Answer 1

I'm really not sure about what im gonna say but i think its this way: The programmer creates the software, when ur software is made to be implemented on other hardware besides pc, the electronics engineer designs the hardware where the software have control over the outputs in that hardware... (just like light bulbs... motors, etc)

Answer 2

Google C++ GPIO. General Purpose Input Output. Look into using a Raspberry Pi or similar device. Or you can use C with an Arduino.