Entering NULL value in C++?

Question

C++ / C#

There is a program that uses std::cin >> variable;.
Why doesn't the program continue when I don't enter anything? I want to get a NULL value, but the function prompts me to enter further.

Answer 1

because when you press enter, you type \n, which is also just a character, and it is skipped. NULL is \0.
I don’t really know what to use, I understand that you need to interfere with work with streams, for example, use cin.get()

Answer 2

www.cplusplus.com/forum/articles/6046

Answer 3

getch()

Answer 4

Because the program waits for a string to be entered and RETURN to be pressed .
You can use the GetKeyState function to determine which keyboard button is currently pressed.