C++字符串处理

1、atoi64,atoi64 l,wtoi64,wtoi64Convert stri ng to _in t64System:Co nvert:ToI nt64,System:Co nvert:ToUI nt64Con vertstri ng toSystem:Co nvert:ToI nt64,longSystem:Co nvert:ToUI nt64ecvt , ecvt sCon vert_ _double toSystem:C on vert:ToStri ngData-Conversion RoutinesRout ineUse.NET Frameworkequivale ntabsF

2、ind absolute value of in tegerSystem:Math:Absatof, atof l,Con vertSystem:C on vert:ToDoublewtof, wtof lstri ng tofloatatoi, atoi l ,Con vertSystem:Co nvert:ToI nt32,wtoi, wtoi lstri ng to intSystem:Co nvert:ToUI nt32stri ng ofspecifiedlen gthfcvt , fcvt sCon vert double to string with specified nu m

3、ber of digits followi ng decimal pointSystem:C on vert:ToStri ng_gcvt ,gcvt sCon vert double nu mber to stri ng; store stri ng in bufferSystem:C on vert:ToStri ng计 oa, i64toa, ui64toa itowCon vert int or _in t64tostringi64tow,labsFind absoluteSystem:Math:Absvalue of longin tegerItoa, Itow ,Con vert

4、longSystem:C on vert:ToStri ngItoa s,to stri ngItow smbbtombcCon vertNot applicable. To call thembbtombc I1-bytesta ndard C fun cti on, usemultibytePin voke. For morecharacter toin formati on, see Platformcorresponding 2-bytevoke Examples.multibyte charactermbcjistojms,Con vertNot applicable. To cal

5、l thembcjistojmsJapa nsta ndard C fun cti on, usel,In dustryPin voke. For morembcjmstojis,Sta ndardin formati on, see Platformmbcjmstojis(JIS)in voke Examples._Lcharacter toJapa nMicrosoft(JMS)charactermbciistoims,Con vert JMSNot applicable. To call thembcjistojmscharacter tosta ndard C fun cti on,

6、use-UJIS characterPin voke. For morembcjmstojis,in formati on, see Platformmbcjmstojisin voke Examples._LmbctohiraCon vertNot applicable. To call theJmbctohira 1,multibytesta ndard C fun cti on, usembctokata, mbctokata lcharacter to1-bytehiraga nacodePin voke . For morein formati on, see Platform祸E-

7、mbctohira,Con vertNot applicable. To call thembctohira l,multibytesta ndard C fun cti on, usembctokata,character toPin voke. For morembctokata l1-bytein formati on, see Platformkataka nain voke Examples.codembctombb,Con vertNot applicable. To call thembctombb l2-bytesta ndard C fun cti on, usemultib

8、ytePin voke. For morecharacter toin formati on, see Platformcorresp ondinin voke Examples.g 1-bytemultibytecharactermbstowcs,Con vertNot applicable. To call thembstowcs 1,sequenee ofsta ndard C fun cti on, usembstowcs_s,multibyte characters to corresp ondin g sequenee of wide charactersPin voke . Fo

9、r more in formati on, see Platformin voke Examples.mbstowcs s丄mbtowc,Con vertNot applicable. To call thembtowc lmultibytesta ndard C fun cti on, usecharacter toPin voke. For morecorresp ondinin formati on, see Platformg widein voke Examples.characterstrtod,Con vertSystem:C on vert:ToDoublestrtod l,s

10、tri ng towcstod,doublewcstod lstrtol, wcstol,Con vertSystem:Convert:ToInt64strtol 1,stri nq to lonqwcstol lin teqerstrtoul,Con vertSystem:Co nvert:ToUi nt64strtoul l,stri ng towcstoul,un sig nedwcstoul llong in tegerstrxfrm,Tran sformSystem:IFormattable:ToStrwcsxfrm.string intoingstrxfrm l,collated

11、formwcsxfrm lbased onlocale-specific in formati ontoasciiCon vertcharacter toASCII codetolower.TestSystem:Char:ToLowertolower,character andtowlower.convert totolower l.lowercase iftowlower lcurre ntlymbctoloweruppercasembctolowermbctoupper, mbctoupper l_tolower,Con vertSystem:Stri ng:ToLowertolower,

12、character totowlower,lowercasetolower l,uncon diti onaltowlower llytoupper,TestSystem:Char:ToUppertoupper,character andtowupper,convert totoupper l,uppercase iftowupper l ,curre ntlymbctolower, mbctolowermbctouppermbctoupperLlowercasetoupper,Con vertSystem:Stri ng:ToUppertoupper,character totowupper

13、,uppercasetoupper l,uncon diti onaltowupper l” Jultoa,Con vertSystem:C on vert:ToStri ngultow ,un sig nedultoa s,long to stri ngultow swcstombs,Con vertNot applicable. To call thewcstombs l ,sequenee ofsta ndard C fun cti on, usewcstombs s,widePin voke. For morewcstombs scharacters toin formati on,

14、see Platform_Lcorresp ondinin voke Examples.g sequenee ofmultibytecharacterswctomb,Con vert wideNot applicable. To call thewctomb lcharacter tosta ndard C fun cti on, usewctomb s,correspondinPin voke. For morewctomb s 1g multibytein formati on, see PlatformcharacterIn voke Examples.atof, atof l,Con

15、vertSystem:Co nvert:Tol nt64,wtof, wtof lwide-charactSystem:Co nvert:ToU In t64,er string to aSystem:C on vert:ToSi ngle,doubleSystem:C on vert:ToDoubleatoi, atoi l ,Con vertNot applicable. To call thewtoi, wtoi lwide-charactsta ndard C fun cti on, useer string toPin voke. For moreintin formati on,

16、see Platformin voke Examples.atoi64,Con vertNot applicable. To call theatoi64 l,wide-charactsta ndard C fun cti on, usewtoi64,erstringtoPin voke. For morewtoi64 lin t64in formati on, see Platformin voke Examples.atol atol lCon vertNot applicable. To call the wtol, wtol lwide-charactsta ndard C fun c

17、ti on, useer stri ng toPin voke. For morelongin formati on, see Platformin voke Examples./char TCHAR WCHAR CStri ngUSES_CONVERSION;char = hello;char = T2A(TCHAR);char = W2A(WCHAR)TCHAR = T( hello);TCHAR = A2T(char);TCHAR = W2T(WCHAR);WCHAR = Lhello;WCHAR = A2W(har);WCHAR = T2W(TCHAR);CStri ng = T(hello);CStri ng = TCHAR;/char赋值、格式化、长度 strcpy_s();spri ntf s();strle n();/TCHAR赋值、格式化、长度_tcscpy_s();_stpri ntf_s();_tcsle n();/WCHAR赋值、格式