Description

The isspace() function tests for any character that is a standard white-space character or is a character for which neither programming c:function isalnum nor programming c:function isgraph is true. The standard white-space characters are the following: space, tab, carriage-return, newline, vertical tab, and form-feed. In the C locale, isspace() returns true only for the standard white-space characters.

The behavior of the isspace() function is affected by the current locale. To modify the behavior, change the LC_CTYPE category in setlocale(), that is, setlocale(LC_CTYPE, newlocale). In the C locale or in a locale where character type information is not defined, characters are classified according to the rules of the U.S. ASCII 7-bit coded character set.

Parameters

• c Is an integer whose value is representable as an unsigned char, or the value of the macro EOF.

Return Values

The isspace() function returns non-zero for true and zero for false. If the parameter is not in the domain of the function, the return result is undefined.