NAN(3) BSD Programmer's Manual NAN(3)NAME
nan, nanf, nanl - return quiet NaN
LIBRARY
libm
SYNOPSIS
#include <math.h>
double
nan(const char *tagp);
float
nanf(const char *tagp);
long double
nanl(const char *tagp);
DESCRIPTION
The call nan(, n-char-sequence"") is equivalent to the call strod(,
NAN(n-char-sequence)"", NULL). The call nan(, "") is equivalent to the
call strod(, NAN()"", NULL).
The nanf() and nanl() functions are equivalent to nan() but substituting
strtof() and strtod(), respectively.
RETURN VALUES
IEEE 754
The nan(), nanf(), and nanl() functions return a quiet NaN as specified
by tagp.
VAX
The nan(), nanf(), and nanl() functions return zero.
SEE ALSOmath(3), strod(3)STANDARDS
The nan(), nanf(), and nanl() functions conform to ISO/IEC 9899:1999
("ISO C99").
MirOS BSD #10-current March 15, 2006 1