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# wcstoul, wcstoull

From cppreference.com
< c‎ | string‎ | wide

Defined in header `<wchar.h>` |  |
unsigned long wcstoul( const wchar_t* str, wchar_t** str_end, int base ); |  |
unsigned long long wcstoull( const wchar_t* str, wchar_t** str_end, int base ); |  | (since C99)

Interprets an unsigned integer value in a wide string pointed to by `str`.

Function discards any whitespace characters (as identified by calling `isspace()`) until first non-whitespace character is found. Then it takes as many characters as possible to form a valid base-n (where n=base) unsigned integer number representation and converts them to an integer value. The valid unsigned integer value consists of the following parts:

- (optional) prefix (`0`) indicating octal base (applies only when the base is 8 or ​0​)
- (optional) prefix (`0x` or `0X`) indicating hexadecimal base (applies only when the base is 16 or ​0​)
- a sequence of digits

The set of valid digits for base-2 integer is `01`, for base-3 integer is `012`, and so on. For bases larger than `10`, valid digits include alphabetic characters, starting from `Aa` for base-11 integer, to `Zz` for base-36 integer. The case of the characters is ignored.

Additional numeric formats may be accepted by the currently installed C locale.

If the value of base is ​0​, the numeric base is auto-detected: if the prefix is `0`, the base is octal, if the prefix is `0x` or `0X`, the base is hexadecimal, otherwise the base is decimal.

The functions sets the pointer pointed to by `str_end` to point to the wide character past the last character interpreted. If `str_end` is NULL, it is ignored.

### [edit] Parameters

str | - | pointer to the null-terminated wide string to be interpreted
str_end | - | pointer to a pointer to a wide character.
base | - | base of the interpreted integer value

### [edit] Return value

Integer value corresponding to the contents of `str` on success. If the converted value falls out of range of corresponding return type, range error occurs and ULONG_MAX or ULLONG_MAX is returned. If no conversion can be performed, ​0​ is returned.

### [edit] Example

| This section is incomplete Reason: no example

### [edit] See also

wcstol wcstoll | converts a wide string to an integer value (function) [edit]
C++ documentation for wcstoul, wcstoull

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