敲代码的第十五天：复数的运算（类和对象）（c++）

#include
using namespace std;
class Complex {
private:
    double real, imag;
public:
    Complex(double r = 0.0, double i = 0.0) {
        real = r;
        imag = i;
    }
    Complex operator  +(Complex c);
    Complex operator  -(Complex c);
    void display();
};
Complex Complex ::operator +(Complex c) {
    return Complex(real + c.real, imag + c.imag);
}
Complex Complex::operator -(Complex c) {
    return  Complex(real - c.real, imag - c.imag);
}
void Complex::display() {
    cout << "(" << real << "," << imag << ")" << endl;
}
int main（）{
    Complex c1(7,8),c2(2,3),c3;
    c3 = c1 + c2;
    c3.display();
    c3 = c1 - c2;
    c3.display();
    return 0;

}