Why i would need to use "Null"?

Question

can u post a simple real code in which u used "Null" and explain to me how does it work in the code and why u used it ?

Answer 1

Null just means nothing. In a real-world context, null can be useful when you want to test if something is empty or not-defined.
For example, if I want to search a user from the list, I could use "null" in the if-else statement first to ascertain that the list exists in the first place.

Answer 2

placeholder for most data types or unsetting an object, like killing a pdo connection

Answer 3

Why we would need to use "Zero" ( 0 )?

Zero is useful for saying 'nothing' when we know the quantity/number is really zero.
But it can be also useful to have another value, which could say that we don't know the count: zero, in this case, isn't really the same.
So, a value as 'Null' allows to assign to variables a non-value ^^

Answer 4

is this question related to a specific language, or any language in general?

Answer 5

C#

Answer 6

thanks for ur answers, all of u really helped me understanding "Null"