NAME    [Toc]    [Back]

     strtod - convert ASCII string to double

SYNOPSIS    [Toc]    [Back]

     #include <stdlib.h>

     double
     strtod(const char *nptr, char **endptr);

DESCRIPTION    [Toc]    [Back]

     The strtod() function converts the initial  portion  of  the
string pointed
     to by nptr to double representation.

     The expected form of the string is an optional plus (`+') or
minus sign
     (`-') followed by a sequence of digits optionally containing
a decimalpoint
 character, optionally followed by an exponent.  An exponent consists
 of an `E' or `e', followed by an optional plus or  minus sign, followed
 by a sequence of digits.

     Leading  whitespace  characters in the string (as defined by
the isspace(3)
     function) are skipped.

RETURN VALUES    [Toc]    [Back]

     The strtod() function returns the converted value, if any.

     If endptr is not NULL, a pointer to the character after  the
last character
  used in the conversion is stored in the location referenced by
     endptr.

     If no conversion is performed, zero is returned and the value of nptr is
     stored in the location referenced by endptr.

     If  the  correct  value  would cause overflow, plus or minus
HUGE_VAL is returned
 (according to the sign of the value), and  ERANGE  is
stored in
     errno.   If the correct value would cause underflow, zero is
returned and
     ERANGE is stored in errno.

ERRORS    [Toc]    [Back]

     [ERANGE]      Overflow or underflow occurred.

SEE ALSO    [Toc]    [Back]

     atof(3), atoi(3), atol(3), strtol(3), strtoul(3)

STANDARDS    [Toc]    [Back]

     The strtod() function conforms to ANSI  X3.159-1989  (``ANSI
C'').

OpenBSD      3.6                           June      29,     1991