7.4.1.7 The islower functionļƒ

Synopsis

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#include <ctype.h>
int islower(int c);

Description

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The islower function tests for any character that is a lowercase letter or is one of a locale-specific set of characters for which none of iscntrl, isdigit, ispunct, or isspace is true. In the ā€œCā€ locale, islower returns true only for the lowercase letters (as defined in 5.2.1).