islower.c File Reference

#include <ctype.h>

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Functions
int	islower (int c)
	Checks if the given character is classified as a lowercase character. More...

Function Documentation

islower()

int islower

(

int

ch

)

Checks if the given character is classified as a lowercase character.

Checks if the given character is classified as a lowercase character using the default local. islower returns true only for the lowercase letters (abcdefghijklmnopqrstuvwxyz). If islower returns true, it is guaranteed that

See also

iscntrl,

isdigit,

ispunct,

isspace will return false for the same character in the same default locale.

The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.

Parameters

ch	The character to classify

Returns

Non-zero value if the character is a lowercase letter, zero otherwise.

Definition at line 5 of file islower.c.

{
    return (unsigned)c - 'a' < 26;
}

Referenced by toupper().

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