#include <iostream> using namespace std; /*********在begin和end之间填入代码，实现complex类的定义，重载前置++运算符和重载后置++运算符及display()函数********/ /***********begin*************/ void Complex::display() { if(real==0) { if(imag>0) cout<<imag<<"i"; else if(imag==0) cout<<real; else cout<<imag<<"i"; } else { if(imag>0) cout<<real<<"+"<<imag<<"i"; else if(imag==0) cout<<real; else cout<<real<<imag<<"i"; } } /***********end************/ int main() { Complex c1,c2; cin>>c1.real>>c1.imag; c1.display(); cout<<endl; ++c1; c2=c1++; c2.display(); cout<<endl; c1.display(); }

下面是完整的代码，实现了complex类的定义，重载了前置++运算符、后置++运算符和display()函数：

#include <iostream> 

using namespace std; 

class Complex { 
private: 
    double real, imag; 

public: 
    Complex(double r = 0, double i = 0) : real(r), imag(i) {} 

    Complex operator++() { 
        ++real; 
        ++imag; 
        return *this; 
    } 

    Complex operator++(int) { 
        Complex temp = *this; 
        ++real; 
        ++imag; 
        return temp; 
    } 

    void display(); 
}; 

void Complex::display() { 
    if(real==0) { 
        if(imag>0) 
            cout<<imag<<"i"; 
        else if(imag==0) 
            cout<<real; 
        else 
            cout<<imag<<"i"; 
    } else { 
        if(imag>0) 
            cout<<real<<"+"<<imag<<"i"; 
        else if(imag==0) 
            cout<<real; 
        else 
            cout<<real<<imag<<"i"; 
    } 
} 

int main() { 
    Complex c1,c2; 

    cin>>c1.real>>c1.imag; 
    c1.display(); 
    cout<<endl; 

    ++c1; 

    c2=c1++; 
    c2.display(); 
    cout<<endl; 

    c1.display(); 

    return 0; 
}

这段代码中，Complex类定义了两个私有成员变量real和imag来存储复数的实部和虚部，重载了前置++运算符和后置++运算符以实现复数的自增运算，同时还定义了display()函数来输出复数。在main函数中，输入了一个复数c1，并对其进行了前置自增运算和后置自增运算，并输出了相应的结果。