Complex类的设计与改进

Complex类

源码

#include <cmath>
#include <iomanip>
#include <iostream>
#include <string>

using namespace std;

class Complex
{
  private:
    double real, imaginary;

  public:
    Complex(double r = 0.0, double i = 0.0) : real(r), imaginary(i){};
    Complex(const Complex &c);
    void add(const Complex m);
    void show();
    double mod();
};

Complex::Complex(const Complex &c)
{
    real = c.real;
    imaginary = c.imaginary;
}

void Complex::add(const Complex m)
{
    real += m.real;
    imaginary += m.imaginary;
}

void Complex::show()
{
    cout << real << std::showpos << imaginary << "i" << std::noshowpos << endl;
}

double Complex::mod()
{
    return sqrt(real * real + imaginary * imaginary);
}

int main()
{
    Complex c1(3, 5);
    Complex c2 = 4.5;
    Complex c3(c1);
    c1.add(c2);
    c1.show();
    cout << c1.mod();
    return 0;
}

运行截图

按照要求写出的Comloex类有点问题，add函数的设计不合理。

改进

源码

#include <cmath>
#include <iomanip>
#include <iostream>
#include <string>

using namespace std;

class Complex
{
private:
  double real, imaginary;

public:
  Complex(double r = 0.0, double i = 0.0) : real(r), imaginary(i){};
  Complex(const Complex &c);
  Complex add(const Complex m);
  void show();
  double mod();
};

Complex::Complex(const Complex &c)
{
  real = c.real;
  imaginary = c.imaginary;
}

Complex Complex::add(const Complex m)
{
  Complex a;
  a.real = real+m.real;
  a.imaginary = imaginary+m.imaginary;
  return a;
}

void Complex::show()
{
  cout << real << std::showpos << imaginary << "i" << std::noshowpos << endl;
}

double Complex::mod()
{
  return sqrt(real * real + imaginary * imaginary);
}

int main()
{
  Complex c1(3, 5);
  Complex c2 = 4.5;
  Complex c3(c1);
  c1 = c1.add(c2);
  c1.show();
  cout << c1.mod();
  cin.get();
  return 0;
}

像这样把结果return回来才比较好。

感想

无