checks wheter its argument is a lowercase letter
This function must be called on character-values only.
| std::is_a_letter | checks wheter its argument is a letter (upper or lower case) |
| std::is_an_uppercase_letter | checks wheter its argument is an uppercase letter |
| std::is_a_letter_character | returns |
| std::is_a_digit | checks wheter its argument is a digit |