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Algorithms Algorithms(算法) bsearch bsearch_s qsort qsort_s Atomic operations Atomic operations library(原子操作庫(kù)) ATOMIC_*_LOCK_FREE atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_exchange atomic_exchange_explicit atomic_fetch_add atomic_fetch_add_explicit atomic_fetch_and atomic_fetch_and_explicit atomic_fetch_or atomic_fetch_or_explicit atomic_fetch_sub atomic_fetch_sub_explicit atomic_fetch_xor atomic_fetch_xor_explicit atomic_flag atomic_flag_clear atomic_flag_clear_explicit ATOMIC_FLAG_INIT atomic_flag_test_and_set atomic_flag_test_and_set_explicit atomic_init atomic_is_lock_free atomic_load atomic_load_explicit atomic_signal_fence atomic_store atomic_store_explicit atomic_thread_fence(線程圍欄) ATOMIC_VAR_INIT kill_dependency memory_order(內(nèi)存排序) C keywords auto(自動(dòng)存儲(chǔ)) break(跳出循環(huán)) C keywords(關(guān)鍵詞) case char const(常量修飾符) continue default(預(yù)設(shè)運(yùn)算式) do double(雙精度浮點(diǎn)型) else enum(枚舉類型) extern(全局變量) float(浮點(diǎn)數(shù)) for fortran goto(goto語(yǔ)句) if(if語(yǔ)句) inline(行內(nèi)函式) int long(長(zhǎng)整型) register(寄存器變量) restrict( restrict類型限定符) return short signed sizeof(sizeof運(yùn)算符) static(靜態(tài)變量) struct(結(jié)構(gòu)體) switch(switch語(yǔ)句) typedef(typedef關(guān)鍵字) union(聯(lián)合體) unsigned(無(wú)符號(hào)) void(空類型) volatile(volatile變量) while(while語(yǔ)句) _Alignas _Alignof _Atomic _Bool _Complex _Generic _Imaginary _Noreturn _Static_assert _Thread_local C language #define directive #elif directive #else directive #endif directive #error directive #if directive #ifdef directive #ifndef directive #include directive #line directive #pragma directive alignas(對(duì)齊指定符) Alternative operators and tokens(替代運(yùn)算符和令牌) Analyzability Arithmetic operators Arithmetic types Array declaration(數(shù)組聲明) Array initialization(陣列初始化) ASCII Chart Assignment operators(賦值運(yùn)算符) types(atomic類型限定符) Basic concepts Bit fields(位域) break statement C language C Operator Precedence cast operator character constant(字符字面量) Comments(注釋符) Comparison operators(比較運(yùn)算符) compound literals(符合字面量) Conditional inclusion(條件包含) Conformance(一致性) const type qualifier(const 限定符) Constant expressions(常量表達(dá)) continue statement Declarations(聲明) do-while loop Enumerations(枚舉類型) Escape sequences(轉(zhuǎn)義字符) Expressions(表達(dá)式) External and tentative definitions(外部和暫定的定義) File scope(文件范圍) floating constant(浮點(diǎn)常量) for loop Function declarations(函數(shù)聲明) Function definitions(函數(shù)聲明) Functions Generic selection泛型選擇 goto statement Identifier(標(biāo)示符) if statement Implicit conversions(隱式轉(zhuǎn)換) Increment/decrement operators(前置/后置操作符) Initialization(初始化) inline function specifier(內(nèi)聯(lián)函式) integer constant Lifetime(生命期) Logical operators(邏輯運(yùn)算符) Lookup and name spaces Main function(主函式) Member access operators(會(huì)員接入運(yùn)營(yíng)商) Memory model Objects and alignment(字節(jié)對(duì)齊) Order of evaluation(評(píng)估順序) Other operators Phases of translation(翻譯階段) Pointer declaration Preprocessor(預(yù)處理) restrict type qualifier(restrict類型限定符) return statement Scalar initialization(標(biāo)量類型初始化) Scope(范圍) sizeof operator(sizeof運(yùn)算符) Statements(陳述) static assert declaration(靜態(tài)斷言聲明) Static storage duration(靜態(tài)存儲(chǔ)周期) Storage-class specifiers(存儲(chǔ)類說(shuō)明符) string literals(字符串字面量) Struct and union initialization(結(jié)構(gòu)體與聯(lián)合體初始化) Struct declaration(結(jié)構(gòu)體聲明) switch statement Thread storage duration(線程存儲(chǔ)時(shí)間) Type Type(類型) Typedef declaration(Typedef聲明) Undefined behavior(未定義行為) Union declaration(聯(lián)合體聲明) Value categories(值類別) Variadic arguments(變長(zhǎng)參數(shù)宏) volatile type qualifier(volatile 類型限定符) while loop _Alignof operator _Noreturn function specifier Date and time asctime(asctime函數(shù)) asctime_s clock CLOCKS_PER_SEC clock_t ctime(ctime函數(shù)) ctime_s Date and time utilities(日期和時(shí)間庫(kù)) difftime(計(jì)算兩個(gè)時(shí)間的間隔) gmtime gmtime_s localtime localtime_s mktime(將時(shí)間結(jié)構(gòu)數(shù)據(jù)轉(zhuǎn)換成經(jīng)過(guò)的秒數(shù)的函數(shù)) strftime(格式化輸出時(shí)間函數(shù)) time timespec timespec_get time_t tm wcsftime(格式化時(shí)間寬字符) Dynamic memory management aligned_alloc C memory management library(內(nèi)存管理庫(kù)) calloc free(釋放動(dòng)態(tài)分配空間的函數(shù)) malloc(動(dòng)態(tài)分配內(nèi)存空間的函數(shù)) realloc(重新分配內(nèi)存空間的函數(shù)) Error handling abort_handler_s assert(斷言) constraint_handler_t errno(錯(cuò)誤報(bào)告) Error handling(錯(cuò)誤處理) Error numbers(錯(cuò)誤個(gè)數(shù)) ignore_handler_s set_constraint_handler_s static_assert File input/output clearerr(清除/復(fù)位) fclose feof ferror fflush(清空文件緩沖區(qū)) fgetc fgetpos fgets fgetwc fgetws File input/output fopen fopen_s fprintf fprintf_s fputc fputs fputwc fputws fread freopen freopen_s fscanf fscanf_s fseek fsetpos ftell fwide fwprintf fwprintf_s fwrite fwscanf fwscanf_s getc getchar gets gets_s getwchar perror printf printf_s putc putchar puts putwc putwchar remove rename rewind scanf scanf_s setbuf setvbuf snprintf sprintf sscanf sscanf_s swprintf swprintf_s swscanf swscanf_s tmpfile tmpfile_s tmpnam tmpnam_s ungetc ungetwc vfprintf vfprintf_s vfscanf vfscanf_s vfwprintf vfwprintf_s vfwscanf vfwscanf_s vprintf vprintf_s vscanf vscanf_s vsnprintf vsprintf vsscanf vsscanf_s vswprintf vswprintf_s vswscanf vswscanf_s vwprintf vwprintf_s vwscanf vwscanf_s wprintf wprintf_s wscanf wscanf_s Localization support lconv LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME localeconv Localization support setlocale Numerics abs acos acosf acosh acoshf acoshl acosl asin asinf asinh asinhf asinhl asinl atan atan2 atan2f atan2l atanf atanh atanhf atanhl atanl cabs cabsf cabsl cacos cacosf cacosh cacoshf cacoshl cacosl carg cargf cargl casin casinf casinh casinhf casinhl casinl catan catanf catanh catanhf catanhl catanl cbrt cbrtf cbrtl ccos ccosf ccosh ccoshf ccoshl ccosl ceil ceilf ceill cexp cexpf cexpl cimag cimagf cimagl clog clogf clogl CMPLX CMPLXF CMPLXL Common mathematical functions complex Complex number arithmetic conj conjf conjl copysign copysignf copysignl cos cosf cosh coshf coshl cosl cpow cpowf cpowl cproj cprojf cprojl creal crealf creall csin csinf csinh csinhf csinhl csinl csqrt csqrtf csqrtl ctan ctanf ctanh ctanhf ctanhl ctanl div double_t erf erfc erfcf erfcl erff erfl exp exp2 exp2f exp2l expf expl expm1 expm1f expm1l fabs fabsf fabsl fdim feclearexcept fegetenv fegetexceptflag fegetround feholdexcept feraiseexcept fesetenv fesetexceptflag fesetround fetestexcept feupdateenv FE_ALL_EXCEPT FE_DFL_ENV FE_DIVBYZERO FE_DOWNWARD FE_INEXACT FE_INVALID FE_OVERFLOW FE_TONEAREST FE_TOWARDZERO FE_UNDERFLOW FE_UPWARD Floating-point environment float_t floor floorf floorl fma fmaf fmal fmax fmaxf fmaxl fmin fminf fminl fmod fmodf fmodl fpclassify FP_INFINITE FP_NAN FP_NORMAL FP_SUBNORMAL FP_ZERO frexp frexpf frexpl HUGE_VAL HUGE_VALF HUGE_VALL hypot hypotf hypotl I ilogb ilogbf ilogbl imaginary imaxabs imaxdiv INFINITY isfinite isgreater isgreaterequal isinf isless islessequal islessgreater isnan isnormal isunordered labs ldexp ldexpf ldexpl ldiv lgamma lgammaf lgammal llabs lldiv llrint llrintf llrintl llround llroundf llroundl log log10 log10f log10l log1p log1pf log1pl log2 log2f log2l logb logbf logbl logf logl lrint lrintf lrintl lround lroundf lroundl MATH_ERREXCEPT math_errhandling MATH_ERRNO modf modff modfl nan NAN nanf nanl nearbyint nearbyintf nearbyintl nextafter nextafterf nextafterl nexttoward nexttowardf nexttowardl Numerics pow powf powl Pseudo-random number generation rand RAND_MAX remainder remainderf remainderl remquo remquof remquol rint rintf rintl round roundf roundl scalbln scalblnf scalblnl scalbn scalbnf scalbnl signbit sin sinf sinh sinhf sinhl sinl sqrt sqrtf sqrtl srand tan tanf tanh tanhf tanhl tanl tgamma tgammaf tgammal trunc truncf truncl Type-generic math _Complex_I _Imaginary_I Program support abort atexit at_quick_exit exit EXIT_FAILURE EXIT_SUCCESS getenv getenv_s jmp_buf longjmp Program support utilities quick_exit raise setjmp SIGABRT SIGFPE SIGILL SIGINT signal SIGSEGV SIGTERM sig_atomic_t SIG_DFL SIG_ERR SIG_IGN system _Exit Strings atof atoi atol atoll btowc c16rtomb c32rtomb char16_t char32_t isalnum isalpha isblank iscntrl isdigit isgraph islower isprint ispunct isspace isupper iswalnum iswalpha iswblank iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit isxdigit mblen mbrlen mbrtoc16 mbrtoc32 mbrtowc mbsinit mbsrtowcs mbsrtowcs_s mbstate_t mbstowcs mbstowcs_s mbtowc memchr memcmp memcpy memcpy_s memmove memmove_s memset memset_s Null-terminated byte strings Null-terminated multibyte strings Null-terminated wide strings strcat strcat_s strchr strcmp strcoll strcpy strcpy_s strcspn strerror strerrorlen_s strerror_s Strings library strlen strncat Thread support call_once cnd_broadcast cnd_destroy cnd_init cnd_signal cnd_timedwait cnd_wait mtx_destroy mtx_init mtx_lock mtx_plain mtx_recursive mtx_timed mtx_timedlock mtx_trylock mtx_unlock once_flag ONCE_FLAG_INIT thrd_busy thrd_create thrd_current thrd_detach thrd_equal thrd_error thrd_exit thrd_join thrd_nomem thrd_sleep thrd_success thrd_timedout thrd_yield Thread support library thread_local tss_create tss_delete TSS_DTOR_ITERATIONS tss_get tss_set Type support Boolean type support library Fixed width integer types FLT_EVAL_METHOD FLT_ROUNDS max_align_t NULL Numeric limits offsetof ptrdiff_t size_t Type support Variadic functions Variadic functions va_arg va_copy va_end va_list va_start
characters

Defined in header <wchar.h>



int vwscanf( const wchar_t *restrict format, va_list vlist );

(1)

(since C99)

int vfwscanf( FILE *restrict stream,               const wchar_t *restrict format, va_list vlist );

(2)

(since C99)

int vswscanf( const wchar_t *restrict buffer,               const wchar_t *restrict format, va_list vlist );

(3)

(since C99)

int vwscanf_s( const wchar_t *restrict format, va_list vlist );

(4)

(since C11)

int vfwscanf_s( FILE *restrict stream,                 const wchar_t *restrict format, va_list vlist );

(5)

(since C11)

int vswscanf_s( const wchar_t *restrict buffer,                 const wchar_t *restrict format, va_list vlist );

(6)

(since C11)

從各種來(lái)源讀取數(shù)據(jù),根據(jù)其解釋并將format結(jié)果存儲(chǔ)到由其定義的位置vlist

1)從中讀取數(shù)據(jù)stdin。

2)從文件流中讀取數(shù)據(jù)stream。

3)從空終止的寬字符串中讀取數(shù)據(jù)buffer。到達(dá)字符串的末尾等同于達(dá)到文件結(jié)束條件fwscanf

4-6)同(1-3),所不同的是%c,%s%[轉(zhuǎn)換說(shuō)明每個(gè)期望兩個(gè)參數(shù)(通常的指針和類型的值rsize_t指示所述接收陣列的大小,其可以是1附有%LC讀取時(shí)成一個(gè)單一的寬字符),除了在運(yùn)行時(shí)檢測(cè)到以下錯(cuò)誤并調(diào)用當(dāng)前安裝的約束處理函數(shù):

  • 指針類型的任何參數(shù)都是空指針

  • formatstream或者buffer是空指針

  • %c,%s或%[,加上終止空字符,將會(huì)超過(guò)為每個(gè)轉(zhuǎn)換說(shuō)明符提供的第二個(gè)(rsize_t)參數(shù)所寫的字符數(shù)

  • 可選地,還有任何其他可檢測(cè)到的錯(cuò)誤,例如未知的轉(zhuǎn)換說(shuō)明符

由于所有的邊界檢查功能,vwscanf_s,vfwscanf_s,和vswscanf_s僅保證可供如果__STDC_LIB_EXT1__由實(shí)現(xiàn)所定義,并且如果用戶定義__STDC_WANT_LIB_EXT1__的整數(shù)常數(shù)1,包括之前<wchar.h>

參數(shù)

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輸入文件流從中讀取



















































































緩沖

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指向以空字符結(jié)尾的寬字符串讀取的指針



















































































格式

-

指向一個(gè)以null結(jié)束的寬字符串的指針,指定如何讀取輸入。格式字符串由非空白寬字符(除%外)組成:格式字符串中的每個(gè)這樣的字符只消耗輸入流中的一個(gè)完全相同的字符,或者如果流中的下一個(gè)字符不相等,則會(huì)導(dǎo)致函數(shù)失敗。空格字符:格式字符串中的任何單個(gè)空格字符都會(huì)消耗輸入中所有可用的連續(xù)空格字符(如同通過(guò)在循環(huán)中調(diào)用iswspace一樣確定)。請(qǐng)注意,格式字符串中的“\ n”,“”,“\ t \ t”或其他空格沒(méi)有區(qū)別。轉(zhuǎn)換規(guī)格。每個(gè)轉(zhuǎn)換規(guī)范具有以下格式:介紹%字符(可選)分配抑制字符*。如果存在此選項(xiàng),則函數(shù)不會(huì)將轉(zhuǎn)換結(jié)果分配給任何接收參數(shù)。(可選)指定最大字段寬度的整數(shù)數(shù)字(大于零),即該函數(shù)在執(zhí)行當(dāng)前轉(zhuǎn)換規(guī)范指定的轉(zhuǎn)換時(shí)允許使用的最大字符數(shù)。請(qǐng)注意,如果未提供寬度,%s和%[可能會(huì)導(dǎo)致緩沖區(qū)溢出。(可選)長(zhǎng)度修飾符,用于指定接收參數(shù)的大小,即實(shí)際的目標(biāo)類型。這會(huì)影響轉(zhuǎn)換精度和溢出規(guī)則。每種轉(zhuǎn)換類型的默認(rèn)目標(biāo)類型都不相同(請(qǐng)參閱下表)。轉(zhuǎn)換格式說(shuō)明符以下格式說(shuō)明符可用:轉(zhuǎn)換說(shuō)明符說(shuō)明參數(shù)類型長(zhǎng)度修飾符hh(C99)。h(無(wú))ll(C99)。j(C99)。z(C99)。t(C99)。L%匹配字面值%N / AN / AN / AN / AN / AN / AN / AN / AN /與c匹配的字符或字符序列如果使用寬度說(shuō)明符,則匹配寬度寬的字符(參數(shù)必須是指向具有足夠空間的陣列的指針)。與%s和%[不同,不會(huì)將空字符追加到數(shù)組。N / AN / A char * wchar_t * N / AN / AN / AN / AN / A與非空白字符序列(字符串)匹配如果使用寬度說(shuō)明符,則匹配寬度或直到第一個(gè)空白字符,以先出現(xiàn)者為準(zhǔn)。除了匹配的字符外,總是存儲(chǔ)一個(gè)空字符(所以參數(shù)數(shù)組必須至少有寬度+ 1個(gè)字符的空間)。集匹配字符集中的非空字符序列。如果該集合的第一個(gè)字符是^,則不匹配該集合中的所有字符。如果該集合以]或^]開頭,則該字符也包含在集合中。它是實(shí)現(xiàn)定義的,字符 - 在掃描集中的非初始位置可以指示一個(gè)范圍,如0-9。如果使用寬度說(shuō)明符,則只匹配寬度。除了匹配的字符外,總是存儲(chǔ)一個(gè)空字符(所以參數(shù)數(shù)組必須至少有寬度+ 1個(gè)字符的空間)。d匹配一個(gè)十進(jìn)制整數(shù)。數(shù)字的格式與wcstol()預(yù)期的基本參數(shù)為10的值相同。有符號(hào)字符*或無(wú)符號(hào)字符*有符號(hào)短符號(hào)*或無(wú)符號(hào)短符號(hào)*有符號(hào)整數(shù)*或無(wú)符號(hào)整數(shù)*有符號(hào)長(zhǎng)符號(hào)*無(wú)符號(hào)長(zhǎng)符號(hào)*長(zhǎng)符號(hào)*長(zhǎng)符號(hào)或無(wú)符號(hào)長(zhǎng)符號(hào)* intmax_t *或uintmax_t * size_t * ptrdiff_t * N / A i匹配一個(gè)整數(shù)。數(shù)字的格式與wcstol()預(yù)期的相同,基本參數(shù)的值為0(基數(shù)由解析的第一個(gè)字符決定)。你匹配一個(gè)無(wú)符號(hào)的十進(jìn)制整數(shù)。數(shù)字的格式與wcstoul()所預(yù)期的相同,基本參數(shù)的值為10。o匹配一個(gè)無(wú)符號(hào)的八進(jìn)制整數(shù)。該數(shù)字的格式與wcstoul()所預(yù)期的基本參數(shù)的值為8相同。x,X匹配一個(gè)無(wú)符號(hào)的十六進(jìn)制整數(shù)。數(shù)字的格式與wcstoul()所預(yù)期的相同,基本參數(shù)的值為16。n返回到目前為止讀取的字符數(shù)。沒(méi)有輸入被消耗。不增加分配計(jì)數(shù)。如果說(shuō)明符具有定義的分配抑制運(yùn)算符,則行為是未定義的。a,A(C99)e,E f,F(xiàn) g,G匹配一個(gè)浮點(diǎn)數(shù)。數(shù)字的格式與wcstof()的預(yù)期相同。N / AN / A float * double * N / AN / AN / AN / long long double * p匹配定義指針的實(shí)現(xiàn)定義字符序列。printf系列函數(shù)應(yīng)該使用%p格式說(shuō)明符產(chǎn)生相同的序列。N / AN / A void ** N / AN / AN / AN / AN / AN / A對(duì)于除n以外的每個(gè)轉(zhuǎn)換說(shuō)明符,輸入字符的最長(zhǎng)序列不超過(guò)任何指定的字段寬度,并且或者正是轉(zhuǎn)換說(shuō)明符所期望的或者是期望的序列的前綴,是從流中消耗的東西。在消耗序列之后的第一個(gè)字符(如果有的話)仍然未讀。如果消耗的序列長(zhǎng)度為零或消費(fèi)的序列無(wú)法如上所述進(jìn)行轉(zhuǎn)換,則會(huì)發(fā)生匹配失敗,除非文件結(jié)束,編碼錯(cuò)誤或讀取錯(cuò)誤阻止來(lái)自流的輸入,在這種情況下,它是輸入失敗。在嘗試解析輸入之前,除[,c和n之外的所有轉(zhuǎn)換說(shuō)明符都會(huì)消耗并放棄所有前導(dǎo)空白字符(如同調(diào)用iswspace一樣確定)。這些消耗的字符不會(huì)計(jì)入指定的最大字段寬度。如果未使用長(zhǎng)度說(shuō)明符l,則轉(zhuǎn)換說(shuō)明符c,s和[執(zhí)行寬到多字節(jié)字符轉(zhuǎn)換,就像調(diào)用wcrtomb()時(shí)mbstate_t對(duì)象在第一個(gè)字符轉(zhuǎn)換之前已初始化為零一樣。轉(zhuǎn)換說(shuō)明符s和[除了匹配的字符外,總是存儲(chǔ)空終止符。目標(biāo)數(shù)組的大小必須至少比指定的字段寬度大1。使用%s或%[,不指定目標(biāo)數(shù)組大小,與get一樣不安全。固定寬度整數(shù)類型(int8_t等)的正確轉(zhuǎn)換規(guī)范在標(biāo)頭<inttypes.h>中定義(盡管SCNdMAX,SCNuMAX等與%jd,%ju等同義)。每個(gè)轉(zhuǎn)換說(shuō)明符的操作之后都有一個(gè)序列點(diǎn); 這允許將多個(gè)字段存儲(chǔ)在相同的“ 導(dǎo)致匹配錯(cuò)誤(消耗的序列不能轉(zhuǎn)換為浮點(diǎn)數(shù)),并保留“r”。現(xiàn)有的實(shí)現(xiàn)不遵循這個(gè)規(guī)則,并回滾到只消耗“100”,留下“呃”,例如glibc錯(cuò)誤1765。導(dǎo)致匹配錯(cuò)誤(消耗的序列不能轉(zhuǎn)換為浮點(diǎn)數(shù)),并保留“r”?,F(xiàn)有的實(shí)現(xiàn)不遵循這個(gè)規(guī)則,并回滾到只消耗“100”,留下“呃”,例如glibc錯(cuò)誤1765。

轉(zhuǎn)換說(shuō)明符

說(shuō)明

參數(shù)類型

長(zhǎng)度修飾符

hh(C99)。

H

(沒(méi)有)

(C99)。

j(C99)。

來(lái)自(C99)。

t(C99)。

%

匹配文字%

N / A

N / A

N / A

N / A

N / A

N / A

N / A

N / A

N / A

C

匹配一個(gè)字符或一系列字符如果使用寬度說(shuō)明符,則匹配寬度寬的字符(參數(shù)必須是指向具有足夠空間的數(shù)組的指針)。與%s和%[不同,不會(huì)將空字符追加到數(shù)組。

N / A

N / A

字符*

wchar_t的*

N / A

N / A

N / A

N / A

N / A

小號(hào)

匹配非空白字符序列(字符串)如果使用寬度說(shuō)明符,則匹配寬度或直到第一個(gè)空白字符(以先出現(xiàn)者為準(zhǔn))。除了匹配的字符外,總是存儲(chǔ)一個(gè)空字符(所以參數(shù)數(shù)組必須至少有寬度+ 1個(gè)字符的空間)。

matches a non-empty sequence of character from set of characters.  If the first character of the set is ^, then all characters not in the set are matched. If the set begins with ] or ^] then the ] character is also included into the set. It is implementation-defined whether the character - in the non-initial position in the scanset may be indicating a range, as in 0-9. If width specifier is used, matches only up to width. Always stores a null character in addition to the characters matched (so the argument array must have room for at least width+1 characters).

d

matches a decimal integer.  The format of the number is the same as expected by wcstol() with the value 10 for the base argument.

signed char* or unsigned char*

signed short* or unsigned short*

signed int* or unsigned int*

signed long* or unsigned long*

signed long long* or unsigned long long*

intmax_t* or uintmax_t*

size_t*

ptrdiff_t*

N/A

i

matches an integer.  The format of the number is the same as expected by wcstol() with the value 0 for the base argument (base is determined by the first characters parsed).

u

matches an unsigned decimal integer.  The format of the number is the same as expected by wcstoul() with the value 10 for the base argument.

o

matches an unsigned octal integer.  The format of the number is the same as expected by wcstoul() with the value 8 for the base argument.

x, X

matches an unsigned hexadecimal integer.  The format of the number is the same as expected by wcstoul() with the value 16 for the base argument.

n

returns the number of characters read so far.  No input is consumed. Does not increment the assignment count. If the specifier has assignment-suppressing operator defined, the behavior is undefined.

a,A(C99)e,E f,F(xiàn) g,G

匹配一個(gè)浮點(diǎn)數(shù)。數(shù)字的格式與wcstof()的預(yù)期相同。

N / A

N / A

浮動(dòng)*

雙*

N / A

N / A

N / A

N / A

長(zhǎng)雙*

p

匹配定義指針的實(shí)現(xiàn)定義的字符序列。printf系列函數(shù)應(yīng)該使用%p格式說(shuō)明符產(chǎn)生相同的序列。

N / A

N / A

無(wú)效**

N / A

N / A

N / A

N / A

N / A

N / A

轉(zhuǎn)換說(shuō)明符

說(shuō)明

參數(shù)類型



















































































長(zhǎng)度修飾符

hh(C99)。

H

(沒(méi)有)

(C99)。

j(C99)。

來(lái)自(C99)。

t(C99)。












































































%

匹配文字%

N / A

N / A

N / A

N / A

N / A

N / A

N / A

N / A

N / A











































































C

匹配一個(gè)字符或一系列字符如果使用寬度說(shuō)明符,則匹配寬度寬的字符(參數(shù)必須是指向具有足夠空間的數(shù)組的指針)。與%s和%[不同,不會(huì)將空字符追加到數(shù)組。

N / A

N / A

字符*

wchar_t的*

N / A

N / A

N / A

N / A

N / A











































































小號(hào)

匹配非空白字符序列(字符串)如果使用寬度說(shuō)明符,則匹配寬度或直到第一個(gè)空白字符(以先出現(xiàn)者為準(zhǔn))。除了匹配的字符外,總是存儲(chǔ)一個(gè)空字符(所以參數(shù)數(shù)組必須至少有寬度+ 1個(gè)字符的空間)。




















































































匹配一組字符中的非空字符序列。如果該集合的第一個(gè)字符是^,則不匹配該集合中的所有字符。如果該集合以]或^]開頭,則該字符也包含在集合中。它是實(shí)現(xiàn)定義的,字符 - 在掃描集中的非初始位置可以指示范圍,如0-9。如果使用寬度說(shuō)明符,則只匹配寬度。除了匹配的字符外,總是存儲(chǔ)一個(gè)空字符(所以參數(shù)數(shù)組必須至少有寬度+ 1個(gè)字符的空間)。




















































































d

匹配一個(gè)十進(jìn)制整數(shù)。數(shù)字的格式與wcstol()預(yù)期的基本參數(shù)為10的值相同。

signed char *或unsigned char *

簽署短*或無(wú)符號(hào)短*

有符號(hào)int *或unsigned int *

簽署長(zhǎng)*或無(wú)符號(hào)長(zhǎng)*

簽署長(zhǎng)長(zhǎng)*或無(wú)符號(hào)長(zhǎng)長(zhǎng)*

intmax_t *或uintmax_t *

為size_t *

ptrdiff_t的*

N / A











































































一世

匹配一個(gè)整數(shù)。數(shù)字的格式與wcstol()預(yù)期的相同,基本參數(shù)的值為0(基數(shù)由解析的第一個(gè)字符決定)。




















































































匹配一個(gè)無(wú)符號(hào)的十進(jìn)制整數(shù)。數(shù)字的格式與wcstoul()所預(yù)期的相同,基本參數(shù)的值為10。




















































































匹配一個(gè)無(wú)符號(hào)的八進(jìn)制整數(shù)。該數(shù)字的格式與wcstoul()所預(yù)期的基本參數(shù)的值為8相同。




















































































x,X

匹配一個(gè)無(wú)符號(hào)的十六進(jìn)制整數(shù)。數(shù)字的格式與wcstoul()所預(yù)期的相同,基本參數(shù)的值為16。




















































































?

返回迄今閱讀的字符數(shù)。沒(méi)有輸入被消耗。不增加分配計(jì)數(shù)。如果說(shuō)明符具有定義的分配抑制運(yùn)算符,則行為是未定義的。




















































































a,A(C99)e,E f,F(xiàn) g,G

匹配一個(gè)浮點(diǎn)數(shù)。數(shù)字的格式與wcstof()的預(yù)期相同。

N / A

N / A

浮動(dòng)*

雙*

N / A

N / A

N / A

N / A

長(zhǎng)雙*











































































p

匹配定義指針的實(shí)現(xiàn)定義的字符序列。printf系列函數(shù)應(yīng)該使用%p格式說(shuō)明符產(chǎn)生相同的序列。

N / A

N / A

無(wú)效**

N / A

N / A

N / A

N / A

N / A

N / A











































































VLIST

-

包含接收參數(shù)的變量參數(shù)列表



















































































返回值

1-3)成功分配的接收參數(shù)數(shù)目,或者EOF在分配第一個(gè)接收參數(shù)前發(fā)生讀取失敗。

4-6)與(1-3)相同,但是EOF如果存在運(yùn)行時(shí)約束沖突,也會(huì)返回。

注意

所有這些函數(shù)都可以調(diào)用va_arg,arg返回后的值是不確定的。這些函數(shù)不會(huì)調(diào)用va_end,并且它必須由調(diào)用者完成。

參考

  • C11 standard (ISO/IEC 9899:2011):

    • 7.29.2.6 The vfwscanf function (p: 418)

    • 7.29.2.8 The vswscanf function (p: 419)

    • 7.29.2.10 The vwscanf function (p: 420)

    • K.3.9.1.7 The vfwscanf_s function (p: 632-633)

    • K.3.9.1.10 The vswscanf_s function (p: 635-636)

    • K.3.9.1.12 The vwscanf_s function (p: 637)

  • C99 standard (ISO/IEC 9899:1999):

    • 7.24.2.6 The vfwscanf function (p: 364)

    • 7.24.2.8 The vswscanf function (p: 365)

    • 7.24.2.10 The vwscanf function (p: 366)

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