complex类

#include<iostream>
#include<cmath>
using namespace std;
class Complex {
public:
    Complex(double x, double y) { real = x;imaginary = y; }
    Complex(double x) { real = x;imaginary = 0; }
    Complex(Complex &t) {real = t.real;imaginary = t.imaginary;}
    void add(Complex &t);
    void show();
    double mod();
private:
    double real, imaginary;
};
void Complex::add(Complex &t) {
    real = t.real + real;
    imaginary = t.imaginary + imaginary;
}
void Complex::show() {
    if(imaginary > 0)
    cout << real << "+" << imaginary << "i" << endl;
    else if (imaginary < 0) cout << real << imaginary << "i" << endl;
    else cout << real << endl;  //虚数为0或小于0时，改变表达方式。避免出现类似a+-bi的情况。
}
double Complex::mod() {
    return sqrt(real * real + imaginary * imaginary);
}
int main() {
    Complex c1(3, 5);
    c1.show();
    Complex c2 = 4.5;
    c2.show();
    Complex c3(c1);
    Complex c4(3, -5);
    c4.show();
    c1.add(c2);
    c1.show();
    cout << c1.mod() << endl;
    return 0;
}