Что значит () в c+++?

Answer 1

I don't understand Russian, but I hope this helps.

C is a computer programming language.
(it's a general porpouse language, we can make very much different programs)
C is very used in the programming world.
(like all the others languages)
C is called a compiled language.

For more:
https://computer.howstuffworks.com/c1.htm#:~:text=C%20is%20a%20computer%20programming,programming%20languages%20currently%20in%20use.&text=C%20is%20what%20is%20called%20a%20compiled%20language.

Answer 2

https://www.sololearn.com/learn/C/2910/

C is a general-purpose programming language that has been around for nearly 50 years.
C has been used to write everything from operating systems (including Windows and many others) to complex programs like the Python interpreter, Git, Oracle database, and more.
The versatility of C is by design. It is a low-level language that relates closely to the way machines work while still being easy to learn.

Answer 3

Не уверен, почему вы пометили сообщение namespace, поскольку ваш вопрос не имеет к нему никакого отношения. () используется для объявления функции без аргументов или для ее вызова.