ms.assetid: b15b5268-7467-49f1-bf95-5299b598f94c

|[abs](../c-runtime-library/reference/abs-labs-llabs-abs64.md)|Find absolute value of integer|

|[atof, _atof_l](../c-runtime-library/reference/atof-atof-l-wtof-wtof-l.md)|Convert string to **`float`**|

|[atoi, _atoi_l](../c-runtime-library/reference/atoi-atoi-l-wtoi-wtoi-l.md)|Convert string to **`int`**|

|[_atoi64, _atoi64_l](../c-runtime-library/reference/atoi64-atoi64-l-wtoi64-wtoi64-l.md)|Convert string to **`__int64`** or **`long long`**|

|[atol, _atol_l](../c-runtime-library/reference/atol-atol-l-wtol-wtol-l.md)|Convert string to **`long`**|

|[c16rtomb, c32rtomb](../c-runtime-library/reference/c16rtomb-c32rtomb1.md)|Convert UTF-16 or UTF-32 character to equivalent multibyte character|

|[_ecvt](../c-runtime-library/reference/ecvt.md), [_ecvt_s](../c-runtime-library/reference/ecvt-s.md)|Convert **`double`** to string of specified length|

|[_fcvt](../c-runtime-library/reference/fcvt.md), [_fcvt_s](../c-runtime-library/reference/fcvt-s.md)|Convert **`double`** to string with specified number of digits following decimal point|

|[_gcvt](../c-runtime-library/reference/gcvt.md), [_gcvt_s](../c-runtime-library/reference/gcvt-s.md)|Convert **`double`** number to string; store string in buffer|

|[_itoa, _ltoa, _ultoa, _i64toa, _ui64toa, _itow, _ltow, ultow, _i64tow, _ui64tow](../c-runtime-library/reference/itoa-itow.md), [_itoa_s, _ltoa_s, _ultoa_s, _i64toa_s, _ui64toa_s, _itow_s, _ltow_s, _ultow_s, _i64tow_s, _ui64tow_s](../c-runtime-library/reference/itoa-s-itow-s.md)|Convert integer types to string|

|[labs](../c-runtime-library/reference/abs-labs-llabs-abs64.md)|Find absolute value of **`long`** integer|

|[llabs](../c-runtime-library/reference/abs-labs-llabs-abs64.md)|Find absolute value of **`long long`** integer|

|[_mbbtombc, _mbbtombc_l](../c-runtime-library/reference/mbbtombc-mbbtombc-l.md)|Convert 1-byte multibyte character to corresponding 2-byte multibyte character|

|[_mbcjistojms, _mbcjistojms_l, _mbcjmstojis, _mbcjmstojis_l](../c-runtime-library/reference/mbcjistojms-mbcjistojms-l-mbcjmstojis-mbcjmstojis-l.md)|Convert Japan Industry Standard (JIS) character to Japan Microsoft (JMS) character|

|[_mbcjistojms, _mbcjistojms_l, _mbcjmstojis, _mbcjmstojis_l](../c-runtime-library/reference/mbcjistojms-mbcjistojms-l-mbcjmstojis-mbcjmstojis-l.md)|Convert JMS character to JIS character|

|[_mbctohira, _mbctohira_l, _mbctokata, _mbctokata_l](../c-runtime-library/reference/mbctohira-mbctohira-l-mbctokata-mbctokata-l.md)|Convert multibyte character to 1-byte hiragana code|

|[_mbctohira, _mbctohira_l, _mbctokata, _mbctokata_l](../c-runtime-library/reference/mbctohira-mbctohira-l-mbctokata-mbctokata-l.md)|Convert multibyte character to 1-byte katakana code|

|[_mbctombb, _mbctombb_l](../c-runtime-library/reference/mbctombb-mbctombb-l.md)|Convert 2-byte multibyte character to corresponding 1-byte multibyte character|

|[mbrtoc16, mbrtoc32](../c-runtime-library/reference/mbrtoc16-mbrtoc323.md)|Convert multibyte character to equivalent UTF-16 or UTF-32 character|

|[mbstowcs, _mbstowcs_l](../c-runtime-library/reference/mbstowcs-mbstowcs-l.md), [mbstowcs_s, _mbstowcs_s_l](../c-runtime-library/reference/mbstowcs-s-mbstowcs-s-l.md)|Convert sequence of multibyte characters to corresponding sequence of wide characters|

|[mbtowc, _mbtowc_l](../c-runtime-library/reference/mbtowc-mbtowc-l.md)|Convert multibyte character to corresponding wide character|

|[strtod, _strtod_l, wcstod, _wcstod_l](../c-runtime-library/reference/strtod-strtod-l-wcstod-wcstod-l.md)|Convert string to **`double`**|

|[strtol, wcstol, _strtol_l, _wcstol_l](../c-runtime-library/reference/strtol-wcstol-strtol-l-wcstol-l.md)|Convert string to **`long`** integer|

|[strtoul, _strtoul_l, wcstoul, _wcstoul_l](../c-runtime-library/reference/strtoul-strtoul-l-wcstoul-wcstoul-l.md)|Convert string to **`unsigned long`** integer|

|[strxfrm, wcsxfrm, _strxfrm_l, _wcsxfrm_l](../c-runtime-library/reference/strxfrm-wcsxfrm-strxfrm-l-wcsxfrm-l.md)|Transform string into collated form based on locale-specific information|

|[toascii, __toascii](../c-runtime-library/reference/toascii-toascii.md)|Convert character to ASCII code|

|[tolower, _tolower, towlower, _tolower_l, _towlower_l](../c-runtime-library/reference/tolower-tolower-towlower-tolower-l-towlower-l.md), [_mbctolower, _mbctolower_l, _mbctoupper, _mbctoupper_l](../c-runtime-library/reference/mbctolower-mbctolower-l-mbctoupper-mbctoupper-l.md)|Test character and convert to lowercase if currently uppercase|

|[tolower, _tolower, towlower, _tolower_l, _towlower_l](../c-runtime-library/reference/tolower-tolower-towlower-tolower-l-towlower-l.md)|Convert character to lowercase unconditionally|

|[toupper, _toupper, towupper, _toupper_l, _towupper_l](../c-runtime-library/reference/toupper-toupper-towupper-toupper-l-towupper-l.md), [_mbctolower, _mbctolower_l, _mbctoupper, _mbctoupper_l](../c-runtime-library/reference/mbctolower-mbctolower-l-mbctoupper-mbctoupper-l.md)|Test character and convert to uppercase if currently lowercase|

|[toupper, _toupper, towupper, _toupper_l, _towupper_l](../c-runtime-library/reference/toupper-toupper-towupper-toupper-l-towupper-l.md)|Convert character to uppercase unconditionally|

|[wcstombs, _wcstombs_l](../c-runtime-library/reference/wcstombs-wcstombs-l.md), [wcstombs_s, _wcstombs_s_l](../c-runtime-library/reference/wcstombs-s-wcstombs-s-l.md)|Convert sequence of wide characters to corresponding sequence of multibyte characters|

|[wctomb, _wctomb_l](../c-runtime-library/reference/wctomb-wctomb-l.md), [wctomb_s, _wctomb_s_l](../c-runtime-library/reference/wctomb-s-wctomb-s-l.md)|Convert wide character to corresponding multibyte character|

|[_wtof, _wtof_l](../c-runtime-library/reference/atof-atof-l-wtof-wtof-l.md)|Convert wide-character string to a **`double`**|

|[_wtoi, _wtoi_l](../c-runtime-library/reference/atoi-atoi-l-wtoi-wtoi-l.md)|Convert wide-character string to **`int`**|

|[_wtoi64, _wtoi64_l](../c-runtime-library/reference/atoi64-atoi64-l-wtoi64-wtoi64-l.md)|Convert wide-character string to **`__int64`** or **`long long`**|

|[_wtol, _wtol_l](../c-runtime-library/reference/atol-atol-l-wtol-wtol-l.md)|Convert wide-character string to **`long`**|

[Universal C runtime routines by category](../c-runtime-library/run-time-routines-by-category.md)<br/>