Open System Services Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

nan(3) OSS Library Calls Reference Manual

NAME

nan - Returns quiet Nan for speciﬁed string

LIBRARY

H-series and J-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCREDLL

32-bit H-series and J-series OSS processes: /G/system/zdllnnn/zcredll

64-bit H-series and J-series OSS processes: /G/system/zdllnnn/ycredll

SYNOPSIS

#include <math.h>

double nan(

const char *tagp);

PARAMETERS

tagp Speciﬁes the string.

DESCRIPTION

The nan( ) function returns a quiet NaN from the speciﬁed string. If tagp does not point to an n-

char-sequence or an empty string, nan( ) is equivalent to

strtod("NAN", (char **) NULL).

NOTES

This function is implemented only for the IEEE_ﬂoat ﬂoating-point option. Applications using

this function cannot be compiled if the speciﬁed ﬂoating-point option is Tandem_ﬂoat.

RETURN VALUES

The nan( ) function returns a quiet NaN, with content indicated through tagp.

ERRORS

No errors are deﬁned.

RELATED INFORMATION

Functions: nanf(3), nanl(3), strtod(3).

Files: math(4).

STANDARDS CONFORMANCE

This function conforms to the ISO/IEC 9899:1999 standard.

This function conforms to the IEEE Std 1003.1, 2004 Edition.

5−2 Hewlett-Packard Company 527187-017