Converts a wide-character string to a double value.
#include <wchar.h>
double wcstod (
const wchar_t *nptr,
wchar_t **endptr);
(IN) Points to the wide-character string to be converted.
(OUT) Points to the first unrecognized character.
If successful, returns the converted value. Otherwise, returns one of the following:
If the correct value causes overflow, returns plus or minus HUGE_VAL and sets errno to ERANGE. The sign of HUGE_VAL matches the sign of the value that cannot be represented.
If the correct value causes underflow, returns a value whose magnitude is no greater than the smallest normalized positive number and sets errno to ERANGE.
If no conversion can be performed, returns 0 and sets errno to EINVAL.
The wcstod function converts the string pointed to by nptr to double representation. The function recognizes a string containing:
Optional whitespace characters
An optional plus (+) or minus (-) sign
A sequence of digits containing an optional decimal point
An optional e or E followed by an optionally signed sequence of digits
The conversion ends at the first unrecognized character. A pointer to that character is stored in the object to which endptr points if endptr is not NULL.