实验三

#include<iostream>

using namespace std;

class rectangle {

public:

 double area(double l,double w);

private:

double length,width;

};

double rectangle::area(double l,double w)

{

length=l;

width=w;

return length*width;

}

int main()

{

rectangle Rectangle;

 double length,width;

cin>>length>>width;

cout<<Rectangle.area(length,width)<<endl;

return 0;

}

#include<iostream>

using namespace std;

class Complex
{
    public:
    Complex(double r0,double i0){
        real=r0;
        imaginary=i0;
        
    };
    Complex(Complex &c0);
    void add(Complex &C0)
    void show();
    private:
        double real,imaginary;
        
};
void Complex::add(Complex &c0)
{
    real+=c0.real,imaginary+=c0.imaginary;
    
}
void Complex::show()
{
    cout<<real‘+‘<<imaginary<<‘i‘<<endl;
    
}
int main()
{

Complex c1(3,5);
Complex(4.5);
c1.add(c2);
c2.show();
return 0;
}