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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)