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title Data Conversion | Microsoft Docs
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ms.date 11/04/2016
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data conversion routines [C++]
converting data
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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 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, _wtof, _wtof_l Convert string to float
atoi, _atoi_l, _wtoi, _wtoi_l Convert string to int
_atoi64, _atoi64_l, _wtoi64, _wtoi64_l Convert string to __int64
atol, _atol_l, _wtol, _wtol_l Convert string to long
_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, _i64toa, _ui64toa, _itow, _i64tow, _ui64tow, _itoa_s, _i64toa_s, _ui64toa_s, _itow_s, _i64tow_s, _ui64tow_s Convert int or __int64 to string
labs Find absolute value of long integer
llabs Find absolute value of long long integer
_ltoa, _ltow, _ltoa_s, _ltow_s Convert long to string
_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
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
_ultoa, _ultow, _ultoa_s, _ultow_s Convert unsigned long to string
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
atof, _atof_l, _wtof, _wtof_l Convert wide-character string to a double
atoi, _atoi_l, _wtoi, _wtoi_l Convert wide-character string to int
_atoi64, _atoi64_l, _wtoi64, _wtoi64_l Convert wide-character string to __int64
atol, _atol_l, _wtol, _wtol_l Convert wide-character string to long

See Also

Run-Time Routines by Category