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单选题在下列成对的表达式中,运算符"+"的意义不相同的一对是______

A. 5.0+2.0和5.0+2

B. 5.0+2.0和5+2.0

C. 5.0+2.0和5+2

D. 5+2.0和5.0+2

C++语言程序设计课程封面

学科：C++语言程序设计

时间：2023-12-17 15:18:35

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What is the correct signature for the overloaded unary operator + in class R

A. R R::operator+(const R &r)B. R R::operator+( )C. R R::operator<+>(const R &r)D. R R::operator(+)(const R &r)

执行如下程序后的输出结果是______.#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( ) << ")";}// ostream& operator<<(ostream &s, const complex &z) {// return s << "(" << z.real( ) << ", " << z.image( ) << ")";// }int main ( ) { complex x(1, -2), y(2, 3); disp(x+=y); // cout << (x+=y); return 0;}

A. (1, -2)B. (2, 3)C. (3, 5)D. (3, 1)

以下程序运行的结果为( ).#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; }};void main ( ) { Num<int> A(3.8), B(4.8); A = A + B; A.disp( );}

A. x = 7B. x = 8C. x = 3D. x = 4

What is the correct signature for the = operator function in class R

A. operator==(const R& s)B. operator=(const R& s)C. R operator=(const R& s)D. R operator==(const R& s)

在下列成对的表达式中,运算符"+"的意义不相同的一对是______

A. 5.0+2.0和5.0+2B. 5.0+2.0和5+2.0C. 5.0+2.0和5+2D. 5+2.0和5.0+2

已知一个类包含如下函数原型:VOLUME operator - (VOLUME)const; ,下列关于这个函数的叙述错误的是______

A. 这是运算符-的重载运算符函数B. 这个函数所重载的运算符一定是一个一元运算符C. 这是一个成员函数D. 这个函数不改变类的任何数据成员的值

What is the correct signature for the overloaded postfix ++ operator in class R

A. R operator++(R &r)B. R operator++( )C. R operator++(int dummy)D. R operator++(int &dummy)

What is the correct signature for the overloaded subscript operator [ ] in class R

A. long R::operator[ ](const int index)B. long &operator[ ](const int index)C. &long operator[ ](const int index)D. long operator&[ ](const int index)

执行如下程序后的输出结果是______.#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( ) << ")";}// ostream& operator<<(ostream &s, const complex &z) {// return s << "(" << z.real( ) << ", " << z.image( ) << ")";// }int main ( ) { complex x(1, -2), y(2, 3); disp(x+=y); // cout << (x+=y); return 0;}

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