How to make cin take only numbers
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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......
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......
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......
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.......
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......
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......
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......
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 ......
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......
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); ......
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......
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......
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......
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? ......
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......
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......
'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......
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......
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......