7.4.1.3 The isblank function

Synopsis

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

Description

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The isblank function tests for any character that is a standard blank character or is one of a locale-specific set of characters for which isspace is true and that is used to separate words within a line of text. The standard blank characters are the following: space (’ ‘), and horizontal tab (’\t’). In the “C” locale, isblank returns true only for the standard blank characters.