NAME

       strtod - convert ASCII string to double

SYNOPSIS

       #include <stdlib.h>

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

DESCRIPTION

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

       The expected form of the string is optional leading white space as checked  by  isspace(3),  an  optional
       plus (``+'') or minus sign (``-'') followed by a sequence of digits optionally containing a decimal-point
       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 non-empty sequence of digits.  If the locale is not "C" or
       "POSIX", different formats may be used.

RETURN VALUES

       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

       ERANGE Overflow or underflow occurred.

CONFORMING TO

       ANSI C

SEE ALSO

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

BSD Manual Page                                  March 4th, 1996                                       STRTOD(3)