Data conversion
These routines convert data from one form to another. Generally these routines execute faster than conversions you might write. Each routine that begins with a to prefix is implemented as a function and as a macro. See Recommendations for choosing between functions and macros for information about choosing an implementation.
Data-conversion routines
| Routine | Use |
|---|---|
abs |
Find absolute value of integer |
atof, _atof_l |
Convert string to float |
atoi, _atoi_l |
Convert string to int |
_atoi64, _atoi64_l |
Convert string to __int64 or long long |
atol, _atol_l |
Convert string to long |
c16rtomb, c32rtomb |
Convert UTF-16 or UTF-32 character to equivalent multibyte character |
_ecvt, _ecvt_s |
Convert double to string of specified length |
_fcvt, _fcvt_s |
Convert double to string with specified number of digits following decimal point |
_gcvt, _gcvt_s |
Convert double number to string; store string in buffer |
_itoa, _ltoa, _ultoa, _i64toa, _ui64toa, _itow, _ltow, ultow, _i64tow, _ui64tow, _itoa_s, _ltoa_s, _ultoa_s, _i64toa_s, _ui64toa_s, _itow_s, _ltow_s, _ultow_s, _i64tow_s, _ui64tow_s |
Convert integer types to string |
labs |
Find absolute value of long integer |
llabs |
Find absolute value of long long integer |
_mbbtombc, _mbbtombc_l |
Convert 1-byte multibyte character to corresponding 2-byte multibyte character |
_mbcjistojms, _mbcjistojms_l, _mbcjmstojis, _mbcjmstojis_l |
Convert Japan Industry Standard (JIS) character to Japan Microsoft (JMS) character |
_mbcjistojms, _mbcjistojms_l, _mbcjmstojis, _mbcjmstojis_l |
Convert JMS character to JIS character |
_mbctohira, _mbctohira_l, _mbctokata, _mbctokata_l |
Convert multibyte character to 1-byte hiragana code |
_mbctohira, _mbctohira_l, _mbctokata, _mbctokata_l |
Convert multibyte character to 1-byte katakana code |
_mbctombb, _mbctombb_l |
Convert 2-byte multibyte character to corresponding 1-byte multibyte character |
mbrtoc16, mbrtoc32 |
Convert multibyte character to equivalent UTF-16 or UTF-32 character |
mbstowcs, _mbstowcs_l, mbstowcs_s, _mbstowcs_s_l |
Convert sequence of multibyte characters to corresponding sequence of wide characters |
mbtowc, _mbtowc_l |
Convert multibyte character to corresponding wide character |
strtod, _strtod_l, wcstod, _wcstod_l |
Convert string to double |
strtol, wcstol, _strtol_l, _wcstol_l |
Convert string to long integer |
strtoul, _strtoul_l, wcstoul, _wcstoul_l |
Convert string to unsigned long integer |
strxfrm, wcsxfrm, _strxfrm_l, _wcsxfrm_l |
Transform string into collated form based on locale-specific information |
toascii, __toascii |
Convert character to ASCII code |
tolower, _tolower, towlower, _tolower_l, _towlower_l, _mbctolower, _mbctolower_l, _mbctoupper, _mbctoupper_l |
Test character and convert to lowercase if currently uppercase |
tolower, _tolower, towlower, _tolower_l, _towlower_l |
Convert character to lowercase unconditionally |
toupper, _toupper, towupper, _toupper_l, _towupper_l, _mbctolower, _mbctolower_l, _mbctoupper, _mbctoupper_l |
Test character and convert to uppercase if currently lowercase |
toupper, _toupper, towupper, _toupper_l, _towupper_l |
Convert character to uppercase unconditionally |
wcstombs, _wcstombs_l, wcstombs_s, _wcstombs_s_l |
Convert sequence of wide characters to corresponding sequence of multibyte characters |
wctomb, _wctomb_l, wctomb_s, _wctomb_s_l |
Convert wide character to corresponding multibyte character |
_wtof, _wtof_l |
Convert wide-character string to a double |
_wtoi, _wtoi_l |
Convert wide-character string to int |
_wtoi64, _wtoi64_l |
Convert wide-character string to __int64 or long long |
_wtol, _wtol_l |
Convert wide-character string to long |