isspace() - white-space character test
#include <ctype.h>
int isspace (int c)
The isspace(3) function tests for the standard white-space characters. This is the obverse of isalnum(3).
The isspace(3) function returns zero if the character tests false and returns non-zero if the character tests true.
isalnum(3)
isalpha(3)
isblank(3)
iscntrl(3)
isdigit(3)
isgraph(3)
islower(3)
isprint(3)
ispunct(3)
isupper(3)
isxdigit(3)
tolower(3)
toupper(3)
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