Is it normal this code ? Why ?

Question

Is it normal this code ?

#define K(y) \
#y 2021

What will be printed if we use printf on y ?

Answer 1

its macro directive in c
#define K(y) #y

as for 2021 i dont know what that does

Now if you use this in code like K(123abc)
this 123abc will be converted to string and it will be a string "123abc"

# - the has is called stringizing operator, but nobody uses macros now

Answer 2

Мартин 😑🎵
But back slash \ it normal to use it without n or t
Bcause i know that \n is for break line \t for tabulation but \ without nothing i am confuse there

Answer 3

Those slashes represent new line in bash
You can write
echo \
2 \
3
and this prints 2 3
its same there writing code in new lines