#include<iostream> using namespace std; class Complex { private: double real, image; public: Complex(double rel = 0, double img = 0) { real = rel; image = img; } void display() { cout << "(" << real; if (image > 0) cout << "+" << image << "*i)"; else if (image < 0) cout << image << "*i)"; else cout << ")"; } friend Complex operator -( Complex& c1, const Complex& c2); friend Complex operator /( Complex& c1, const Complex& c2); friend Complex operator ==(Complex& c1, Complex& c2); friend Complex operator !=(Complex& c1, Complex& c2); friend ostream operator <<(Complex& c1, Complex& c2); }; Complex operator -( Complex& c1, const Complex& c2) { Complex temp; temp.real = c1.real - c2.real; temp.image = c1.image - c2.image; return temp; } Complex operator /( Complex& c1, const Complex& c2) { Complex FFF; FFF.real = c1.real / c2.real; FFF.image = c1.image / c2.image; return FFF; } int main() { Complex c1(10, 9), c2(3, -4), c3; c3 = c1 / 5; c1.display(); cout << "/"; cout << 5; cout << "="; c3.display(); cout << endl; return 0; //输出比较的结果 cout<<"c1==c2 ? 结果:"; cout<<(c1==c2)<<endl; cout<<"c1!=c2 ? 结果:"; cout<<(c1!=c2)<<endl; }严重性 代码 说明 项目 文件 行 禁止显示状态 错误 C2678 二进制“<<”: 没有找到接受“std::ostream”类型的左操作数的运算符(或没有可接受的转换)帮我修改并给出正确代码

需要将友元函数的返回类型改为 ostream&，并在函数内部将输出语句改为 return os，同时在 main 函数内输出对象的语句需要改为 cout << c1 << endl; 和 cout << c2 << endl;。代码如下：

#include<iostream>  
using namespace std;   

class Complex {  
private:      
    double real, image;  
public:      
    Complex(double rel = 0, double img = 0) {          
        real = rel;          
        image = img;      
    }      
    void display() {          
        cout << "(" << real;          
        if (image > 0)              
            cout << "+" << image << "*i)";          
        else if (image < 0)              
            cout << image << "*i)";          
        else              
            cout << ")";      
    }       
    friend Complex operator -(Complex& c1, const Complex& c2);      
    friend Complex operator /(Complex& c1, const Complex& c2);      
    friend bool operator ==(Complex& c1, Complex& c2);     
    friend bool operator !=(Complex& c1, Complex& c2);     
    friend ostream& operator <<(ostream& os, Complex& c); 
};   

Complex operator -(Complex& c1, const Complex& c2) {      
    Complex temp;      
    temp.real = c1.real - c2.real;      
    temp.image = c1.image - c2.image;      
    return temp;  
}   

Complex operator /(Complex& c1, const Complex& c2) {      
    Complex FFF;      
    FFF.real = c1.real / c2.real;      
    FFF.image = c1.image / c2.image;      
    return FFF;  
}   

bool operator ==(Complex& c1, Complex& c2) {
    return (c1.real == c2.real) && (c1.image == c2.image);
}

bool operator !=(Complex& c1, Complex& c2) {
    return !(c1 == c2);
}

ostream& operator <<(ostream& os, Complex& c) {
    os << "(" << c.real;
    if (c.image > 0)
        os << "+" << c.image << "*i)";
    else if (c.image < 0)
        os << c.image << "*i)";
    else
        os << ")";
    return os;
}

int main() {      
    Complex c1(10, 9), c2(3, -4), c3;      
    c3 = c1 / 5;      
    c1.display();      
    cout << "/";      
    cout << 5;      
    cout << "=";      
    c3.display();      
    cout << endl; 

    cout << "c1 == c2 ? 结果:";
    cout << (c1 == c2) << endl;
    cout << "c1 != c2 ? 结果:";
    cout << (c1 != c2) << endl;

    cout << c1 << endl;
    cout << c2 << endl;
    
    return 0;
}