strtod man page on Xenix

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STRTOD(3)							     STRTOD(3)

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 an optional plus  (``+'')  or	 minus
       sign  (``-''), followed by a sequence of digits optionally containing a
       decimal-point character, optionally followed by an exponent.  An	 expo‐
       nent  consists  of  an  ``E'' or ``e'', followed by an optional plus or
       minus sign, followed by a sequence of digits.

       Leading white-space characters in the string (as defined	 by  the  iss‐
       pace(3) function) are skipped.

       The strtod function returns the converted value, if any.

       If  endptr is not NULL, a pointer to the character after the last char‐
       acter 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.

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

STANDARDS
       Strtod conforms to ANSI X3.159-1989 (``ANSI C'').

BUGS
       This  manual  page  represents  intent instead of actual practice.  The
       strtod(3) function is not currently available.

4.4 Berkeley Distribution	 May 16, 1990			     STRTOD(3)
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