What does the symbol \0 mean in a string-literal?

Question

Consider following code:

char str[] = \"Hello\\0\";

What is the length of str array, and with how much 0s it is ending?

Answer 1

Specifically, I want to mention one situation, by which you may confuse.

What is the difference between "\0" and ""?

The answer is that "\0" represents in array is {0 0} and "" is {0}.

Because "\0" is still a string literal and it will also add "\0" at the end of it. And "" is empty but also add "\0".

Understanding of this will help you understand "\0" deeply.