NAN(3) BSD Library Functions Manual NAN(3)NAME
nan, nanf, nanl — return quiet NaN
LIBRARY
Math Library (libm, -lm)
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 strtod("NAN(n-
char-sequence)", NULL). The call nan("") is equivalent to the call
strtod("NAN()", NULL).
The nanf() and nanl() functions are equivalent to nan() but substituting
strtod().
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), strtod(3)STANDARDS
The nan(), nanf(), and nanl() functions conform to ISO/IEC 9899:1999
(“ISO C99”).
BSD March 15, 2006 BSD