[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f33Cey_z_qJo792MyvfKhYtHCVwLd_wmC5F0eFAn3FL4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":13,"question":17,"related":18,"source":28,"type":29},[],"2025-12-18 10:35:52",271806377,[8,9,10,11,12],"ABC","CBA","AAA","BBB","CCC",{"courseId":14,"courseImg":15,"courseName":16},"8336f75d6d4cb0ae106461502e8ea0e0","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8d8e99875725bed83e7cb68c2de07f03.jpg","C++语言程序设计","What will be displayed by the following program?#include <iostream>using namespace std;class CC {public: virtual string toString( ) { return "C"; }};class BB: public CC { string toString( ) { return "B"; }};class AA: public BB { virtual string toString( ) { return "A"; }};void displayObject(CC p) { cout << p.toString( );}int main( ) { AA a; BB b; CC c; displayObject(a); displayObject(b); displayObject(c); return 0;}",[19,30,39,48,58,67,76,85,91,100],{"answer":20,"createTime":5,"id":21,"options":22,"question":27,"source":28,"type":29},[],271806368,[23,24,25,26],"long R::operator[ ](const int index)","long &operator[ ](const int index)","&long operator[ ](const int index)","long operator&[ ](const int index)","What is the correct signature for the overloaded subscript operator [ ] in class R","v1",0,{"answer":31,"createTime":5,"id":32,"options":33,"question":38,"source":28,"type":29},[],271806369,[34,35,36,37],"(1, -2)","(2, 3)","(3, 5)","(3, 1)","The output result after executing the following program is ( )#include <iostream>using namespace std;class complex {private: double re, im;public: complex (double r, double i) : re(r), im(i) { } double real ( ) const { return re; } double image ( ) const { return im; } complex &operator += (complex a) { re += a.re; im += a.im; return *this; }};void disp(const complex &z) { cout << "(" << z.real( ) << ", " << z.image( ) << ")";}int main ( ) { complex x(1, -2), y(2, 3); disp(x+=y); return 0;}",{"answer":40,"createTime":5,"id":41,"options":42,"question":47,"source":28,"type":29},[],271806370,[43,44,45,46],"x = 7","x = 8","x = 3","x = 4","The result of running the following program is ( ).#include <iostream>using namespace std;template <class T>class Num {private: T x;public: Num( ) { } Num(T x) { this->x = x; } Num<T>& operator + (const Num<T>& x2) { static Num<T> temp; temp.x = x + x2.x; return temp; } void disp( ) { cout << "x = " << x; }};int main ( ) { Num<int> A(3.8), B(4.8); A = A + B; A.disp( ); return 0;}",{"answer":49,"createTime":5,"id":50,"options":51,"question":57,"source":28,"type":29},[],271806371,[52,53,54,55,56],"int operator( )","R(int n)","friend R operator+(int r1, const R& r2)","R operator+(const R& r1)","friend R operator+(const R& r2, int r1)","Suppose r is an object with class type R, in order to perform 4 + r, the R class header file must contain",{"answer":59,"createTime":5,"id":60,"options":61,"question":66,"source":28,"type":29},[],271806372,[62,63,64,65],"functions operator+( ) and operator*( ) contain two parameters","functions operator+( ) and operator*( ) contain two and one parameters, respectively","functions operator+( ) and operator*( ) contain one and two parameters, respectively","functions operator+( ) and operator*( ) contain one parameter","In the expression x + y * z, operator + is overloaded using a member function, and * is overloaded using a non-member function. Then, which of the following is correct",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":28,"type":29},[],271806373,[71,72,73,74],"Fraction operator+ (Fraction, Fraction)","Fraction operator- ( )","Fraction& operator= (Fraction&, Fraction)","Fraction& operator+= (Fraction&, Fraction)","The followings are prototypes of a binary operator function overloaded as a non-member function except for ( )",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":28,"type":29},[],271806374,[80,81,82,83],"default constructor","parameter constructor","a copy constructor","none of the above","To convert a fundamental type to a class type, we need to create a ( )",{"answer":86,"createTime":5,"id":87,"options":88,"question":90,"source":28,"type":29},[],271806375,[80,81,82,89],"conversion operator","To convert a class type into a fundamental type, we need a ( )",{"answer":92,"createTime":5,"id":93,"options":94,"question":99,"source":28,"type":29},[],271806376,[95,96,97,98],"The constructor of class AA is not called","The constructor of class AA is called and it displays "i from AA is 0"","The constructor of class AA is called and it displays "i from AA is 40"","The constructor of class AA is called and it displays "i from AA is 60"","Analyze the following program:#include <iostream>using namespace std;class AA {public: AA( ) { t( ); cout << "i from AA is " << i << endl; } void t( ) { setI(20); } virtual void setI(int i) { this->i = 2*i; } int i;};class BB: public AA {public: virtual void setI(int i) { this->i = 3*i; }};int main( ) { AA *p = new BB( ); return 0;}",{"answer":101,"createTime":5,"id":6,"options":102,"question":17,"source":28,"type":29},[],[8,9,10,11,12]]