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Data Conversion

 

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at 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 .NET Framework equivalent
abs Find absolute value of integer System::Math::Abs
atof, _atof_l, _wtof, _wtof_l Convert string to float System::Convert::ToDouble
atoi, _atoi_l, _wtoi, _wtoi_l Convert string to int System::Convert::ToInt32, System::Convert::ToUInt32
_atoi64, _atoi64_l, _wtoi64, _wtoi64_l Convert string to __int64 System::Convert::ToInt64, System::Convert::ToUInt64
atol, _atol_l, _wtol, _wtol_l Convert string to long System::Convert::ToInt64, System::Convert::ToUInt64
_ecvt, _ecvt_s Convert double to string of specified length System::Convert::ToString
_fcvt, _fcvt_s Convert double to string with specified number of digits following decimal point System::Convert::ToString
_gcvt, _gcvt_s Convert double number to string; store string in buffer System::Convert::ToString
_itoa, _i64toa, _ui64toa, _itow, _i64tow, _ui64tow, _itoa_s, _i64toa_s, _ui64toa_s, _itow_s, _i64tow_s, _ui64tow_s Convert int or __int64 to string System::Convert::ToString
labs Find absolute value of long integer System::Math::Abs
_ltoa, _ltow, _ltoa_s, _ltow_s Convert long to string System::Convert::ToString
_mbbtombc, _mbbtombc_l Convert 1-byte multibyte character to corresponding 2-byte multibyte character Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_mbcjistojms, _mbcjistojms_l, _mbcjmstojis, _mbcjmstojis_l Convert Japan Industry Standard (JIS) character to Japan Microsoft (JMS) character Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_mbcjistojms, _mbcjistojms_l, _mbcjmstojis, _mbcjmstojis_l Convert JMS character to JIS character Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_mbctohira, _mbctohira_l, _mbctokata, _mbctokata_l Convert multibyte character to 1-byte hiragana code Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_mbctohira, _mbctohira_l, _mbctokata, _mbctokata_l Convert multibyte character to 1-byte katakana code Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_mbctombb, _mbctombb_l Convert 2-byte multibyte character to corresponding 1-byte multibyte character Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
mbstowcs, _mbstowcs_l, mbstowcs_s, _mbstowcs_s_l Convert sequence of multibyte characters to corresponding sequence of wide characters Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
mbtowc, _mbtowc_l Convert multibyte character to corresponding wide character Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
strtod, _strtod_l, wcstod, _wcstod_l Convert string to double System::Convert::ToDouble
strtol, wcstol, _strtol_l, _wcstol_l Convert string to long integer System::Convert::ToInt32
strtoul, _strtoul_l, wcstoul, _wcstoul_l Convert string to unsigned long integer System::Convert::ToUInt32
strxfrm, wcsxfrm, _strxfrm_l, _wcsxfrm_l Transform string into collated form based on locale-specific information System::IFormattable::ToString
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 System::Char::ToLower
tolower, _tolower, towlower, _tolower_l, _towlower_l Convert character to lowercase unconditionally System::String::ToLower
toupper, _toupper, towupper, _toupper_l, _towupper_l, _mbctolower, _mbctolower_l, _mbctoupper, _mbctoupper_l Test character and convert to uppercase if currently lowercase System::Char::ToUpper
toupper, _toupper, towupper, _toupper_l, _towupper_l Convert character to uppercase unconditionally System::String::ToUpper
_ultoa, _ultow, _ultoa_s, _ultow_s Convert unsigned``long to string System::Convert::ToString
wcstombs, _wcstombs_l, wcstombs_s, _wcstombs_s_l Convert sequence of wide characters to corresponding sequence of multibyte characters Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
wctomb, _wctomb_l, wctomb_s, _wctomb_s_l Convert wide character to corresponding multibyte character Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
atof, _atof_l, _wtof, _wtof_l Convert wide-character string to a double System::Convert::ToInt64, System::Convert::ToUInt64, System::Convert::ToSingle, System::Convert::ToDouble
atoi, _atoi_l, _wtoi, _wtoi_l Convert wide-character string to int Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_atoi64, _atoi64_l, _wtoi64, _wtoi64_l Convert wide-character string to __int64 Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
atol, _atol_l, _wtol, _wtol_l Convert wide-character string to long Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

See Also

Run-Time Routines by Category