STRTOD (3)
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
SEE ALSO
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