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 ALSOatof(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)