strtoimax, _strtoimax_l, wcstoimax, _wcstoimax_l
For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.
Converts a string to an integer value of the largest supported signed integer type.
intmax_t strtoimax( const char *nptr, char **endptr, int base ); intmax_t wcstoimax( const wchar_t *nptr, wchar_t **endptr, int base ); intmax_t _strtoimax_l( const char *nptr, char **endptr, int base, _locale_t locale ); intmax_t _wcstoimax_l( const wchar_t *nptr, wchar_t **endptr, int base, _locale_t locale );
Null-terminated string to convert.
Pointer to the character that stops the scan.
Number base to use.
The locale to use.
strtoimax returns the value that's represented in the string
nptr, except when the representation would cause an overflow—in that case, it returns
errno is set to
ERANGE. The function returns 0 if no conversion can be performed.
wcstoimax returns values analogously to
INTMAX_MIN are defined in stdint.h.
NULL or the
base is nonzero and either less than 2 or greater than 36,
errno is set to
For more information about return codes, see errno, _doserrno, _sys_errlist, and _sys_nerr.
strtoimax function converts
nptr to an
intmax_t. The wide-character version of
nptr argument is a wide-character string. Otherwise, these functions behave identically. Both functions stop reading the string
nptr at the first character they cannot recognize as part of a number. This may be the terminating null character, or it may be the first numeric character that's greater than or equal to
LC_NUMERIC category setting determines recognition of the radix character in
nptr; for more information, see setlocale, _wsetlocale. The functions that don't have the
_l suffix use the current locale;
_wcstoimax_l are identical to the corresponding functions that don't have the
_l suffix except that they instead use the locale that's passed in. For more information, see Locale.
endptr is not
NULL, a pointer to the character that stopped the scan is stored at the location that's pointed to by
endptr. If no conversion can be performed (no valid digits were found or an invalid base was specified), the value of
nptr is stored at the location that's pointed to by
|TCHAR.H routine||_UNICODE & _MBCS not defined||_MBCS defined||_UNICODE defined|
nptr to point to a string of the following form:
X }]] [
whitespace may consist of space and tab characters, which are ignored;
digits are one or more decimal digits;
letters are one or more of the letters 'a' through 'z' (or 'A' through 'Z'). The first character that does not fit this form stops the scan. If
base is between 2 and 36, then it is used as the base of the number. If
base is 0, the initial characters of the string pointed to by
nptr are used to determine the base. If the first character is '0' and the second character is not 'x' or 'X', the string is interpreted as an octal integer. If the first character is '0' and the second character is 'x' or 'X', the string is interpreted as a hexadecimal integer. If the first character is '1' through '9', the string is interpreted as a decimal integer. The letters 'a' through 'z' (or 'A' through 'Z') are assigned the values 10 through 35; only letters whose assigned values are less than
base are permitted. The first character outside the range of the base stops the scan. For example, if
base is 0 and the first character scanned is '0', an octal integer is assumed and an '8' or '9' character would stop the scan.
For additional compatibility information, see Compatibility.
String to Numeric Value Functions
strtod, _strtod_l, wcstod, _wcstod_l
strtol, wcstol, _strtol_l, _wcstol_l
strtoul, _strtoul_l, wcstoul, _wcstoul_l
strtoumax, _strtoumax_l, wcstoumax, _wcstoumax_l
atof, _atof_l, _wtof, _wtof_l