Initialize string in Ada with null characters

Question

I am new to Ada, I need to make initialize a string with null characters, how can I do it? So far I can initialize a string with spaces as follows:

user_str : String(1..50) := (others => ' ');

Answer 1

user_str : String(1..50) := (others => Character'Val(0));

or

user_str : String(1..50) := (others => Ada.Characters.Latin_1.NUL);

Unlike some other languages, Ada does not have a special syntax for embedding speclal characters in character or string literals (like C's '\0', for example).

(Of course the latter requires an appropriate with clause.)