NAN(3C)NAN(3C)NAME
nan, nanf, nanl - functions that return a quiet NaN
SYNOPSIS
#include <math.h>
double nan(const char *tagp);
float nanf(const char *tagp);
long double nanl(const char *tagp);
DESCRIPTION
These routines are not available for programs compiled with the O32 ABI.
Here tagp is a pointer to a null-terminated character
sequence composed of alphanumeric characters and underscores (_).
The call nan("n-char-seq") 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 a n-char-sequence or an empty
string, the call is equivalent to strtod("NAN", (char **) NULL);
Calls to nanf and nanl are equivalent to the corresponding calls to
strtof and strtold.
RETURN VALUES
The nan functions return a quiet NaN; Current implementation on Irix
systems ignores the character sequence pointed to by tagp.
SEE ALSOmath(3M)
Page 1
