What is ‘NULL Character ’?

Answer 1

(*(void)0)

Answer 2

Null character is zero-valued ASCII character.
https://en.m.wikipedia.org/wiki/Null

Answer 3

Null Character is zero-valued .

Answer 4

Its a character that announces the end of a string
If you want to define a string as a char array and give it an initial value, the last element will be the null character and it's passed as this '\0'