c++重點(diǎn)復(fù)習(xí)看懂必過(guò)

假設(shè)Test為一個(gè)類，執(zhí)行Test*p=newTest[4];Test*a[4];delete[]p;語(yǔ)句時(shí)會(huì)自動(dòng)調(diào)用該類構(gòu)造函數(shù)和析構(gòu)函數(shù)的次數(shù)是〔D〕A)構(gòu)造函數(shù)1次，析構(gòu)函數(shù)1次B)構(gòu)造函數(shù)8次，析構(gòu)函數(shù)8次C)構(gòu)造函數(shù)8次，析構(gòu)函數(shù)4次D)構(gòu)造函數(shù)4次，析構(gòu)函數(shù)4次關(guān)于new運(yùn)算符的以下描述中，〔D〕是錯(cuò)誤的。A)它可以用來(lái)動(dòng)態(tài)創(chuàng)立對(duì)象和對(duì)象數(shù)組B)使用它創(chuàng)立的對(duì)象或?qū)ο髷?shù)組可以使用運(yùn)算符delete刪除C)使用它創(chuàng)立對(duì)象時(shí)要調(diào)用構(gòu)造函數(shù)D)使用它創(chuàng)立對(duì)象數(shù)組時(shí)，可以為對(duì)象顯示指定值進(jìn)行初始化關(guān)于類成員的訪問(wèn)屬性，以下說(shuō)法中錯(cuò)誤的選項(xiàng)是(B)。A.公用成員可以在類外直接訪問(wèn) B.私有數(shù)據(jù)成員只能被本類的公用成員函數(shù)訪問(wèn)C.保護(hù)成員在派生類中也可以訪問(wèn) D.在main函數(shù)中不能訪問(wèn)對(duì)象的保護(hù)成員在具有共同基類的多重繼承中，使用(A)消除二義性。A.虛基類 B.抽象類 C.虛函數(shù) D.友元類假設(shè)要對(duì)類Sample增加類型轉(zhuǎn)換函數(shù)，可以將Sample類對(duì)象轉(zhuǎn)換為int，那么函數(shù)聲明原型為〔A〕。A.operatorint()const; B.intoperatorint()const; C.operatorSample()const; D.int()const;以下關(guān)于指針和引用的說(shuō)法中錯(cuò)誤的選項(xiàng)是〔D〕。A.指針保存內(nèi)存地址B.引用就是變量的別名C.指針使用過(guò)程中可以改變其指向D.引用在使用過(guò)程中可以引用其他的變量#include<iostream>usingnamespacestd;classBase{public: virtualvoidfun1() { cout<<'0'<<endl; } voidfun2() { cout<<'1'<<endl; } virtual~Base() { cout<<"desBase"<<endl; }};classDerived:publicBase{public: voidfun1() { cout<<'2'<<endl; } voidfun2() { cout<<'3'<<endl; } ~Derived() { cout<<"desDerived"<<endl; }};intmain(){ Base*p=newDerived; p->fun1(); p->fun2(); deletep; return0;}#include<iostream>usingnamespacestd;classA{ intm_a;public: A():m_a(0) { cout<<"ConA1"<<endl; } A(inta):m_a(a) { cout<<"ConA2"<<endl; }};classB{ intm_b;public: B():m_b(0) { cout<<"ConB1"<<endl; } B(intb):m_b(b) { cout<<"ConB2"<<endl; }};classC:publicA{ Bm_oB;public: C() { cout<<"ConC1"<<endl; } C(inta,intb):A(a),m_oB(b) { cout<<"ConC2"<<endl; }};intmain(){ Cc1; Cc2(4,5); return0;}針對(duì)三維圖形聲明IThreeDimShape接口類，它里面有求外表積〔getArea〕和求體積〔getVolume〕的兩個(gè)純虛函數(shù)，Ball類〔球體〕和Cylinder類〔圓柱體〕均要實(shí)現(xiàn)IThreeDimShape接口類，Ball類的數(shù)據(jù)成員有球體半徑，Cylinder類的數(shù)據(jù)成員有底面圓半徑和高。constdoublePI=3.14;classIThreeDimShape{ virtualdoubleGetArea()const=0; virtualdoubleGetVolume()const=0;};classBall:publicIThreeDimShape{ doublem_dR;public: Ball(doubler=0):m_dR(r){} virtualdoubleGetArea()const { return4*PI*m_dR*m_dR; } virtualdoubleGetVolume()const { returnPI*m_dR*m_dR*m_dR*4/3; }};classCylinder:publicIThreeDimShape{ doublem_dR; doublem_dHeight;public: Cylinder(doubler=0,doubleh=0): m_dR(r),m_dHeight(h) {} virtualdoubleGetArea()const { return2*PI*m_dR*m_dR+ m_dHeight*2*PI*m_dR; } virtualdoubleGetVolume()const { returnPI*m_dR*m_dR*m_dHeight; }};

定義一個(gè)數(shù)組類的類模板Arraytemplate<typenameT,intn=10>classArray{ TData[n]; constintm_nSize; public: Array():m_nSize(n) {} T&operator[](intindex) {returnm_pData[index];} intGetSize()const{returnm_nSize;} TFind()const;//找到最大元素};template<typenameT,int