c++练习题-----复数的运算

7-1 复数类的运算 (20分)

根据以下代码段完善 ?? 处内容及程序内容,以实现规定的输出。

class Complex
{
	public:
		Complex(double r=0, double i=0):real(r), imag(i){	}
		Complex operator+( ?? ) const;//重载双目运算符'+'
		Complex operator-=( ?? ); //重载双目运算符'-='
		friend Complex operator-( ?? ) const;//重载双目运算符'-'
		void Display() const;
	private:
		double real;
		double imag;
};

void Complex::Display() const
{
	cout << "(" << real << ", " << imag << ")" << endl;
}

int main()
{
	double r, m;
	cin >> r >> m;
	Complex c1(r, m);
	cin >> r >> m;
	Complex c2(r, m);
	Complex c3 = c1+c2;
	c3.Display();
	c3 = c1-c2;
	c3.Display();
	c3 -= c1;
	c3.Display();
	return 0;
}

输入格式:

输入有两行,分别为两个复数的实部与虚部。

输出格式:

按样例格式输出结果。

输入样例:

在这里给出一组输入。例如:

4 2
3 -5

输出样例:

在这里给出相应的输出。例如:

(7, -3)
(1, 7)
(-3, 5)

 代码实现:

#include 
using namespace std;
class Complex
{
	public:
		Complex(double r=0, double i=0):real(r), imag(i){	}
		Complex operator+(Complex c) const;//重载双目运算符'+'
		Complex operator-=(Complex c); //重载双目运算符'-='
		friend const Complex operator-(Complex c1,Complex c2) ;//重载双目运算符'-',const放在后面比较好
		void Display() const;
	private:
		double real;
		double imag;
};
Complex Complex::operator+ (Complex c)const{
//可以这样写,也可以像下面那样写,同时在这里的this和c的理解要透彻,比如c1+c2其本质上就是因为其为
    //成员函数,不是全局函数,所以函数参数数目少一,而这里的this 指向的是c1而c是等价于c2的可以这么理解,重载运算符是重载运算
    //符和后面的数
 // c.imag=c.imag+this->imag;   
// c.real=c.real+this->real;
return Complex(real+c.real,imag+c.imag);//这样更加简便,下面的减运算也是
}
Complex Complex::operator-=(Complex c){//而这里的-=一定只能这样写,要不然就是错误的
this->imag=this->imag-c.imag;
this->real=this->real-c.real;
return *this;

}
const Complex operator-(Complex c1,Complex c2){
c1.imag=c1.imag-c2.imag;
c1.real=c1.real-c2.real;
return c1;
}

void Complex::Display() const
{
	cout << "(" << real << ", " << imag << ")" << endl;
}

int main()
{
	double r, m;
	cin >> r >> m;
	Complex c1(r, m);
	cin >> r >> m;
	Complex c2(r, m);
	Complex c3 = c1+c2;
	c3.Display();
	c3 = c1-c2;
	c3.Display();
	c3 -= c1;
	c3.Display();
	return 0;
}


以上均为个人的小观点和小看法,如有错误,欢迎来指正。

 

 

 

 

 

 

 

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