HP-UX Reference (11i v1 00/12) - 3 Library Functions N-Z (vol 7)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD

/build/1111/BRICK/man3/nan.3m

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nan(3M) nan(3M)

NAME

nan() - string-to-NaN conversion function

SYNOPSIS

#include <math.h>

double nan(const char *tagp);

DESCRIPTION

The nan() function creates a quiet NaN from the speciﬁed string. The call nan("n-char-sequence")

is equivalent to strtod("NAN( n-char-sequence)", (char**) NULL). The call nan("") is

equivalent to strtod("NAN()", (char**) NULL). If tagp does not point to an n-char-sequence

string, the result NaN’s content is unspeciﬁed.

The ISO/ANSI C committee has approved the nan() function for inclusion in the C9X draft standard.

To use this function, compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE

options. Make sure your program includes <math.h>. Link in the math library by specifying -lm on the

compiler or linker command line.

RETURN VALUE

The nan() function returns a quiet NaN.

ERRORS

No errors are deﬁned.