plz can u explain why u wrote it like that?
like how it came to u to think about it

because you have using namespace std;, the compiler thinks islower is referring to the one in <locale>, not the one in <cctype>. either remove the using, or disambiguate the function reference with the :: operator: ::islower.

yuh

but the return value will be retuned as an integer. it won't convert to a char. that's not what you want the function to do

Please use spoiler flag next time, your post was visible in the homepage.

only to see what the output will look like

It's lambda-function, which finds out is number even (return true) or not (return false).

The bullets must be made of silver, and the dragons are allergic to silver, that's why they hoard gold!

Yeah

hi,
tried it on godbolt,
the resulting assembly-code will be the same,
so there's no real difference.
From my point of view it's just a habit to mark
any cast with the available keywords..
even in katas, it just grew into my muscle memory.

Source of the habit might be this: "https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines" (chapter ES.49) some but not all went in our companies codestyle-guide, so i'm just used to it.

Please use spoiler flag next time you explain a solution.

They're poisoned anti-dragon bullets.