NAME
atof, atof_l – convert ASCII string to double
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
double
atof(const char *str);
#include <xlocale.h>
double
atof_l(const char *str, locale_t loc);
DESCRIPTION
The atof() function converts the initial portion of the string pointed to by str to double representation.
It is equivalent to:
strtod(str, (char **)NULL);
The decimal point character is defined in the program's locale (category LC_NUMERIC).
While the atof() function uses the current locale, the atof_l() function may be passed a locale directly. See xlocale(3) for more information.
IMPLEMENTATION NOTES
The atof() and atof_l() functions are thread-safe and async-cancel-safe.
The strtod() and strtod_l() functions are recommended instead of atof() and atof_l() functions, especially 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 ISO/IEC 9945-1:1990 (“POSIX.1”), ISO/IEC 9899:1990 (“ISO C90”), and ISO/IEC 9899:1999 (“ISO C99”).