isupper.c File Reference

#include <ctype.h>

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Functions
int	isupper (int c)
	Checks if the given character is an uppercase character. More...

Function Documentation

isupper()

int isupper

(

int

ch

)

Checks if the given character is an uppercase character.

Checks if the given character is an uppercase character using the default local. isupper returns true only for the uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ). If isupper 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 an uppercase letter, zero otherwise.

Definition at line 5 of file isupper.c.

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

Referenced by strtol(), strtoll(), strtoul(), and tolower().

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