240
收录了59512篇文章 ·61549个问题 · 0人关注
0

How to make cin take only numbers

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Hereisthecode doubleenter_number() { doublenumber; while(1) { cin>>number; if(cin.fail()) { ......

0

What happens if I assign a negative value to an un

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: IwascurioustoknowwhatwouldhappenifIassignanegativevaluetoanunsignedvariable. Thecodewilllooksomewhatlikethis. unsign......

0

C++: Life span of temporary arguments?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: WhencreatinganewinstanceofaMyClassasanargumenttoafunctionlikeso: classMyClass { MyClass(inta); }; myFunction(MyClass......

0

Overloading by return type

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: IreadfewquestionshereonSOaboutthistopicwhichseemsyetconfusingtome.I\'vejustbeguntolearnC++andIhaven\'tstudiedtempla......

0

Why does modulus division (%) only work with integ

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Irecentlyranintoanissuethatcouldeasilybesolvedusingmodulusdivision,buttheinputwasafloat: Givenaperiodicfunction(e.......

0

Recommended way to initialize srand?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Ineeda\'good\'waytoinitializethepseudo-randomnumbergeneratorinC++.I\'vefoundanarticlethatstates: Inordertogenerater......

0

Can I list-initialize a vector of move-only type?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: IfIpassthefollowingcodethroughmyGCC4.7snapshot,ittriestocopytheunique_ptrsintothevector. #include<vector> #include<memo......

0

Why cast unused return values to void?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: intfn(); voidwhatever() { (void)fn(); } Isthereanyreasonforcastinganunusedreturnvaluetovoid,oramIrightinthinkingi......

0

Why the switch statement cannot be applied on stri

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Compilingthefollowingcodeandgottheerroroftypeillegal. intmain() { //Compilationerror-switchexpressionoftypeillegal ......

0

What happens if you call erase() on a map element

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: InthefollowingcodeIloopthroughamapandtestifanelementneedstobeerased.Isitsafetoerasetheelementandkeepiteratingor......

0

Inheriting constructors

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Whydoesthiscode: classA { public: explicitA(intx){} }; classB:publicA { }; intmain(void) { B*b=newB(5); ......

0

Optimizing away a “while(1);” in C++0x

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Updated,seebelow! IhaveheardandreadthatC++0xallowsancompilertoprint\"Hello\"forthefollowingsnippet #include<iostream> i......

0

Why is it wrong to use std::auto_ptr<> with sta

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Whyisitwrongtousestd::auto_ptr<>withstandardcontainers? 回答1: TheC++StandardsaysthatanSTLelementmustbe\"copy-construc......

0

How to convert vector to array

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: HowdoIconvertastd::vector<double>toadoublearray[]? 回答1: There\'safairlysimpletricktodoso,sincethespecnowguarantees......

0

Initialization of a normal array with one default

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Thisquestionalreadyhasananswerhere: Howtoinitializeallmembersofanarraytothesamevalue? ......

0

How to get current time and date in C++?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Isthereacross-platformwaytogetthecurrentdateandtimeinC++? 回答1: InC++11youcanusestd::chrono::system_clock::now() Exa......

0

Pointer vs. Reference

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Whatwouldbebetterpracticewhengivingafunctiontheoriginalvariabletoworkwith: unsignedlongx=4; voidfunc1(unsignedlong&val......

0

'printf' vs. 'cout' in C++

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: Whatisthedifferencebetweenprintf()andcoutinC++? 回答1: I\'msurprisedthateveryoneinthisquestionclaimsthatstd::coutiswa......

0

Is < faster than <=?

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: I\'mreadingabookwheretheauthorsaysthatif(a<901)isfasterthanif(a<=900). Notexactlyasinthissimpleexample,butther......

0

function parameter evaluation order

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):问题: InC/C++,isthereafixedorderforevaluationofparametertothefunction?Imean,whatdothestandardssay?Isitleft-to-rightorright......