【c++】实现一个复数类

// 实现一个复数类（complex）
//要求：1：实现不带参 / 带参数 /带默认参数的几种构造函数。
//      2:实现拷贝构造 / 析构函数。

#include <iostream>
using namespace std;

// 带参数的构造函数
class complex
{
	private:
		double _real;
		double _image;
	public:
		void print();
		complex(double _r, double _i);
		~complex();
};

complex::complex(double _r, double _i)
{
	_real = _r;
	_image = _i;
	cout<<"the parameterless constructor"<<endl;
}


/* 不带参数的构造函数
class complex
{
	private:
		double _real;
		double _image;
	public:
		void print();
		complex();
		~complex();
};

complex::complex()
{
	_real = 0;
	_image = 0;
	cout<<"with no arguments constructor"<<endl;
}*/


/* 带默认参数的构造函数
class complex
{
	private:
		double _real;
		double _image;
	public:
		void print();
		complex(double _real = 0,double _image = 0);
		~complex();
};

complex::complex(double _r, double _i)
{
	_real = _r;
	_image = _i;
	cout<<"with the default constructor"<<endl;
}*/


/* 拷贝构造
class complex
{
	private:
		double _real;
		double _image;
	public:
		void print();
		complex(double _r, double _i)
		{
			_real = _r;
			_image = _i;
		}
		complex(complex const & comple);
		~complex();
};

complex::complex(complex const & comple)
{
	_real = comple._real;
	_image = comple._image;
	cout<<"copy structure"<<endl;
}*/


complex::~complex()
{
	cout << "destructor" << endl;
}

void complex::print()
{
	cout << "复数是：" << _real << "+" <<_image << "i" << endl;
}

int main()
{
	double a, b;
	//double a;
	cout << "请输入两个数：";
	cin >> a >> b;
	//cin >> a;
	//complex comp(a);
	complex comp(a,b);
	//complex comp(1, 2);
	//complex comp;
	//complex comp1(comp);
	comp.print();
	//comp1.print();
	return 0;
}

【c++】实现一个复数类

原文：http://blog.csdn.net/zhaoyaqian552/article/details/45268895