![]() Wcstod, wcstol, wcstoul, _wcstoi64, and _wcstoui64 are wide-character versions of strtod, strtol, strtoul, _strtoi64, and _strtoui64, respectively the pointer to an end-of-conversion argument to each of these wide-character functions is a wide-character string. _I64_MAX, _I64_MIN, and _UI64_MAX are defined in. When the value returned by these functions would cause an overflow or underflow, or when conversion isn't possible, special case values are returned as shown: Function The versions of these functions without the _l suffix use the current locale for this locale-dependent behavior the versions with the _l suffix are identical except that they use the locale parameter passed in instead. The output value is affected by the setting of the LC_NUMERIC category setting of the locale. strtoul and _strtoui64 allow a plus ( +) or minus ( -) sign prefix a leading minus sign indicates that the return value is negated. 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. If the first character is '1' through '9', the string is interpreted as a decimal 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 0 and the second character isn't 'x' or 'X', the string is interpreted as an octal integer otherwise, it's interpreted as a decimal number. If it's 0, the initial characters referenced to by the end-of-conversion pointer are used to determine the base. If the base argument is between 2 and 36, then it's used as the base of the number. Strtod expects a string of the following form: If no conversion can be performed (no valid digits were found or an invalid base was specified), the value of the string pointer is stored at that address. If the user-supplied pointer to an end-of-conversion character isn't set to NULL or nullptr at call time, a pointer to the character that stopped the scan will be stored there instead. For strtol, strtoul, _strtoi64, and _strtoui64, this terminating character can also be the first numeric character greater than or equal to the user-supplied number base. This character may be the terminating null character. Each function stops reading the string at the first character it can't recognize as part of a number. The input string is a sequence of characters that can be interpreted as a numerical value of the specified type. strtol, strtoul, _strtoi64 and _strtoui64 take a third argument as the number base to use in the conversion process. The strtod function takes two arguments: the first is the input string, and the second a pointer to the character that ends the conversion process. The string argument to each of these wide-character functions is a wide-character string each function behaves identically to its single-byte-character counterpart otherwise. ![]() Wcstod, wcstol, wcstoul, and _wcstoi64 are wide-character versions of strtod, strtol, strtoul, and _strtoi64, respectively. FunctionĬonvert string to double-precision floating point valueĬonvert string to unsigned 64-bit _int64 integer The available functions are listed in the following table. ![]() _strtoui64, _wcstoui64, _strtoui64_l, _wcstoui64_lĮach function in the strto* family converts a null-terminated string to a numeric value. ![]()
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