std::islower
From cppreference.com
| Defined in header <cctype>
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| int islower( int ch ); |
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Checks if the given character is classified as a lowercase character according to the current C locale. In the default "C" locale, std::islower returns a nonzero value only for the lowercase letters (abcdefghijklmnopqrstuvwxyz).
If islower returns a nonzero value, it is guaranteed that std::iscntrl, std::isdigit, std::ispunct, and std::isspace return zero for the same character in the same C locale.
The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.
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