isalnum()

int	LocalIsAlphaNumeric(
        int	__C);

This routine returns true if the passed character is alphanumeric.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

isalpha()

int	isalpha(
        int	__C);

This routine returns true if the passed character is alphabetic.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

iscntrl()

int	iscntrl(
        int	__C);

This routine returns true if the passed character is a control character.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

isdigit()

int	isdigit(
        int	__c);

This routine returns true if the passed character is a decimal digit.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

isgraph()

int	isgraph(
        wint	__C);

This routine returns true if the passed character is displayable.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

islower()

int	islower(
        int	__C);

This routine returns true if the passed character is a lower case alphabetic character.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

isprint()

int	isprint(
        int	__C);

This routine returns true if the passed character is printable (i.e. takes up a space when printing).

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

ispunct()

int	ispunct(
        int	__c);

This routine returns true if the passed character is a punctuation mark.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

isspace()

int	isspace(
        int	__c);

This routine returns true if the passed character is whitespace.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

isupper()

int	isupper(
        int	__c);

This routine returns true if the passed character is an upper case alphabetic character.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h

isxdigit()

int	isxdigit(
        int	__C);

This routine returns true if the passed character is a hexadecimal digit.

Warnings: If you pass a char to this routine, beware: the routine takes an integer, and if the passed value gets sign-extended, the result may not be what you expect.

Include: localize.h