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generationrandRAND_MAXremainderremainderfremainderlremquoremquofremquolrintrintfrintlroundroundfroundlscalblnscalblnfscalblnlscalbnscalbnfscalbnlsignbitsinsinfsinhsinhfsinhlsinlsqrtsqrtfsqrtlsrandtantanftanhtanhftanhltanltgammatgammaftgammaltrunctruncftrunclType-generic math_Complex_I_Imaginary_IProgram supportabortatexitat_quick_exitexitEXIT_FAILUREEXIT_SUCCESSgetenvgetenv_sjmp_buflongjmpProgram support utilitiesquick_exitraisesetjmpSIGABRTSIGFPESIGILLSIGINTsignalSIGSEGVSIGTERMsig_atomic_tSIG_DFLSIG_ERRSIG_IGNsystem_ExitStringsatofatoiatolatollbtowcc16rtombc32rtombchar16_tchar32_tisalnumisalphaisblankiscntrlisdigitisgraphislowerisprintispunctisspaceisupperiswalnumiswalphaiswblankiswcntrliswctypeiswdigitiswgraphiswloweriswprintiswpunctiswspaceiswupperiswxdigitisxdigitmblenmbrlenmbrtoc16mbrtoc32mbrtowcmbsinitmbsrtowcsmbsrtowcs_smbstate_tmbstowcsmbstowcs_smbtowcmemchrmemcmpmemcpymemcpy_smemmovememmove_smemsetmemset_sNull-terminated byte stringsNull-terminated multibyte stringsNull-terminated wide stringsstrcatstrcat_sstrchrstrcmpstrcollstrcpystrcpy_sstrcspnstrerrorstrerrorlen_sstrerror_sStrings librarystrlenstrncatThread supportcall_oncecnd_broadcastcnd_destroycnd_initcnd_signalcnd_timedwaitcnd_waitmtx_destroymtx_initmtx_lockmtx_plainmtx_recursivemtx_timedmtx_timedlockmtx_trylockmtx_unlockonce_flagONCE_FLAG_INITthrd_busythrd_createthrd_currentthrd_detachthrd_equalthrd_errorthrd_exitthrd_jointhrd_nomemthrd_sleepthrd_successthrd_timedoutthrd_yieldThread support librarythread_localtss_createtss_deleteTSS_DTOR_ITERATIONStss_gettss_setType supportBoolean type support libraryFixed width integer typesFLT_EVAL_METHODFLT_ROUNDSmax_align_tNULLNumeric limitsoffsetofptrdiff_tsize_tType supportVariadic functionsVariadic functionsva_argva_copyva_endva_listva_start
文字

在头文件<wctype.h>中定义



int iswprint(wint_t ch);


(自C95以来)

检查给定的宽字符是否可以打印,即它是数字(0123456789),大写字母(ABCDEFGHIJKLMNOPQRSTUVWXYZ),小写字母(abcdefghijklmnopqrstuvwxyz),标点符号(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~),空格还是特定于当前C语言环境的任何可打印字符。

参数

CH

-

宽字符

返回值

如果可以打印宽字符,则为非零值,否则为零。

#include <stdio.h>#include <wchar.h>#include <wctype.h>#include <locale.h>
 int main(void){
    wchar_t c = L'\u2002'; // Unicode character 'EN SPACE'    printf("in the default locale, iswprint(%#x) = %d\n", c, !!iswprint(c));    setlocale(LC_ALL, "en_US.utf8");    printf("in Unicode locale, iswprint(%#x) = %d\n", c, !!iswprint(c));
    wchar_t c2 = L'\x82'; // break permitted    printf("in Unicode locale, iswprint(%#x) = %d\n", c2, !!iswprint(c2));}

输出:

in the default locale, iswprint(0x2002) = 0in Unicode locale, iswprint(0x2002) = 1in Unicode locale, iswprint(0x82) = 0

参考

  • C11标准(ISO / IEC 9899:2011):

    • 7.30.2.1.8 iswprint函数(p:450)

  • C99标准(ISO / IEC 9899:1999):

    • 7.25.2.1.8 iswprint函数(p:396)

扩展内容

isprint

检查一个字符是否是打印字符(功能)

| 用于iswprint的C ++文档 |

ASCII 值  (十六进制)

字符

iscntrl  iswcntrl.

isprint  iswprint.

isspace  iswspace.

isblank  iswblank.

isgraph  iswgraph.

ispunct  iswpunct.

isalnum  iswalnum.

isalpha  iswalpha.

isupper  iswupper.

islower  iswlower.

isdigit  iswdigit.

isxdigit  iswxdigit.


0 - 8

0x00-0x08

控制码 (NUL, etc.)

≠0

0

0

0

0

0

0

0

0

0

0

0

9

0x09

tab (\t)

≠0

0

≠0

≠0

0

0

0

0

0

0

0

0

10 - 13

0x0A-0x0D

空格 (\n,\v,\f,\r)

≠0

0

≠0

0

0

0

0

0

0

0

0

0

14 - 31

0x0E-0x1F

控制码

≠0

0

0

0

0

0

0

0

0

0

0

0

32

0x20

space

0

≠0

≠0

≠0

0

0

0

0

0

0

0

0

33 - 47

0x21-0x2F

!"#$%&'()*+,-./

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

48 - 57

0x30-0x39

0123456789

0

≠0

0

0

≠0

0

≠0

0

0

0

≠0

≠0

58 - 64

0x3a-0x40

:;<=>?@

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

65 - 70

0x41-0x46

ABCDEF

0

≠0

0

0

≠0

0

≠0

≠0

≠0

0

0

≠0

71 - 90

0x47-0x5A

GHIJKLMNOPQRSTUVWXYZ

0

≠0

0

0

≠0

0

≠0

≠0

≠0

0

0

0

91 - 96

0x5B-0x60

[]^_` | 0 | ≠0 | 0 | 0 | ≠0 | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 |













97 -102

0x61-0x66

abcdef

0

≠0

0

0

≠0

0

≠0

≠0

0

≠0

0

≠0

103-122

0x67-0x7A

ghijklmnopqrstuvwxyz

0

≠0

0

0

≠0

0

≠0

≠0

0

≠0

0

0

123-126

0x7B-0x7E

{|}~

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

127

0x7F

退格(DEL)

≠0

0

0

0

0

0

0

0

0

0

0

0

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在头文件<wctype.h>中定义



int iswdigit(wint_t ch);


(自C95以来)

检查给定的宽字符是否对应(如果缩小)十个十进制数字字符0123456789中的一个。

参数

CH

-

宽字符

返回值

如果宽字符是数字字符,则为非零值,否则为零。

注意

iswdigitiswxdigit是唯一不受当前安装的C语言环境影响的标准宽字符分类函数。

一些语言环境提供了检测非ASCII数字的附加字符类。

#include <stdio.h>#include <wctype.h>#include <wchar.h>#include <locale.h> void test(wchar_t a3, wchar_t u3, wchar_t j3){    printf("        '%lc' '%lc' '%lc'\n", a3, u3, j3);    printf("iswdigit %d    %d   %d\n",           !!iswdigit(a3), !!iswdigit(u3), !!iswdigit(j3));    printf("jdigit:  %d    %d   %d\n", !!iswctype(a3, wctype("jdigit")),          !!iswctype(u3, wctype("jdigit")),          !!iswctype(j3, wctype("jdigit")));}
 int main(void){
    wchar_t a3 = L'3';  // the ASCII digit 3
    wchar_t u3 = L'三'; // the CJK numeral 3
    wchar_t j3 = L'3'; // the fullwidth digit 3 
    setlocale(LC_ALL, "en_US.utf8");    puts("In American locale:");    test(a3, u3, j3); 
    setlocale(LC_ALL, "ja_JP.utf8");    puts("\nIn Japanese locale:");    test(a3, u3, j3);}

输出:

In American locale:        '3' '三' '3'iswdigit 1    0   0jdigit:  0    0   0
 In Japanese locale:        '3' '三' '3'iswdigit 1    0   0jdigit:  0    0   1

参考

  • C11标准(ISO / IEC 9899:2011):

    • 7.30.2.1.5 iswdigit函数(p:449)

  • C99标准(ISO / IEC 9899:1999):

    • 7.25.2.1.5 iswdigit函数(p:395)

扩展内容

isdigit

检查一个字符是否是一个数字(功能)

| 用于iswdigit的C ++文档 |

ASCII 值  (十六进制)

字符

iscntrl  iswcntrl.

isprint  iswprint.

isspace  iswspace.

isblank  iswblank.

isgraph  iswgraph.

ispunct  iswpunct.

isalnum  iswalnum.

isalpha  iswalpha.

isupper  iswupper.

islower  iswlower.

isdigit  iswdigit.

isxdigit  iswxdigit.


0 - 8

0x00-0x08

控制码 (NUL, etc.)

≠0

0

0

0

0

0

0

0

0

0

0

0

9

0x09

tab (\t)

≠0

0

≠0

≠0

0

0

0

0

0

0

0

0

10 - 13

0x0A-0x0D

空格 (\n,\v,\f,\r)

≠0

0

≠0

0

0

0

0

0

0

0

0

0

14 - 31

0x0E-0x1F

控制码

≠0

0

0

0

0

0

0

0

0

0

0

0

32

0x20

space

0

≠0

≠0

≠0

0

0

0

0

0

0

0

0

33 - 47

0x21-0x2F

!"#$%&'()*+,-./

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

48 - 57

0x30-0x39

0123456789

0

≠0

0

0

≠0

0

≠0

0

0

0

≠0

≠0

58 - 64

0x3a-0x40

:;<=>?@

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

65 - 70

0x41-0x46

ABCDEF

0

≠0

0

0

≠0

0

≠0

≠0

≠0

0

0

≠0

71 - 90

0x47-0x5A

GHIJKLMNOPQRSTUVWXYZ

0

≠0

0

0

≠0

0

≠0

≠0

≠0

0

0

0

91 - 96

0x5B-0x60

[]^_` | 0 | ≠0 | 0 | 0 | ≠0 | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 |













97 -102

0x61-0x66

abcdef

0

≠0

0

0

≠0

0

≠0

≠0

0

≠0

0

≠0

103-122

0x67-0x7A

ghijklmnopqrstuvwxyz

0

≠0

0

0

≠0

0

≠0

≠0

0

≠0

0

0

123-126

0x7B-0x7E

{|}~

0

≠0

0

0

≠0

≠0

0

0

0

0

0

0

127

0x7F

退格 (DEL)

≠0

0

0

0

0

0

0

0

0

0

0

0

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