nan(3) - NetBSD Manual Pages

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NAN(3)                  NetBSD 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
     strtof() and strtold(), 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 ALSO

     math(3), strtod(3)


STANDARDS

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

NetBSD 8.0                      March 15, 2006                      NetBSD 8.0