NAME
atof, atof_l
— convert ASCII string to
double
LIBRARY
library “libc”
SYNOPSIS
#include
<stdlib.h>
double
atof(const
char *nptr);
#include
<xlocale.h>
double
atof_l(const
char *nptr, locale_t
loc);
DESCRIPTION
Theatof()
function converts the initial portion of the string pointed to by
nptr to double representation.
It is equivalent to:
strtod(nptr, NULL);
The decimal point character is defined in the program's locale
(category LC_NUMERIC).
The _l-suffixed version takes an explicit locale argument, whereas the non-suffixed version use the current global or per-thread locale.
IMPLEMENTATION NOTES
The atof() function is not thread-safe and
also not async-cancel-safe.
The atof() function has been deprecated by
strtod() and should not be used in new code.
ERRORS
The function atof() need not affect the
value of errno on an error.
SEE ALSO
atoi(3), atol(3), strtod(3), strtol(3), strtoul(3), xlocale(3)
STANDARDS
The atof() function conforms to
IEEE Std 1003.1-1990 (“POSIX.1”),
ISO/IEC 9899:1990 (“ISO C90”),
and ISO/IEC 9899:1999
(“ISO C99”).