DragonFly On-Line Manual Pages

NAN(3)		      DragonFly 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 ALSO
     math(3), strtod(3)

STANDARDS
     The nan(), nanf(), and nanl() functions conform to ISO/IEC 9899:1999
     (``ISO C99'').

DragonFly 3.5			March 15, 2006			 DragonFly 3.5