c++ 实验三

#include<iostream>
using namespace std;
class rectangle {
public:
    rectangle(float l, float w);
    float area();
private:
    float length, width;
};
rectangle::rectangle(float l, float w) {
    length = l;
    width = w;
}
float rectangle::area() {
    return length * width;
}
int main() {
    float length, width;
    cout << "Enter the length and width of the rectangle:";
    cin >> length >> width;
    rectangle a(length, width);
    cout << a.area() << endl;
    return 0;
}

#include<iostream>
using namespace std;
class Complex {
public:
    Complex(float re, float im);
    Complex(float re);
    void add(Complex &c) {
        real += c.real;
    };
    void show() {
        cout << real << (imaginary>0?'+':'-') << imaginary << "i" << endl;
    };
private:
    float real, imaginary;
};
Complex::Complex(float re, float im) {
    real = re;
    imaginary = im;
};
Complex::Complex(float re) {
    real = re;
    imaginary = 0;
};
int main(){
    Complex c1(3,5);
    Complex c2 = 4.5;
    c1.add(c2);
    c1.show();
    return 0;
}