第八周实验报告（一）

方案一： 请用类的成员函数完成运算符的重载。

#include <iostream>
using namespace std;
class Complex
{
public:
	Complex(){real=0;imag=0;}
	Complex(double r,double i){real=r;imag=i;}
	Complex operator+(Complex &c2);
	Complex operator-(Complex &c2);
	Complex operator*(Complex &c2);
	Complex operator/(Complex &c2);
	void display();
private:
	double real;
	double imag;
};
//下面定义成员函数

int main()
{
	Complex c1(3,4),c2(5,-10),c3;
	cout<<"c1=";
	c1.display();
	cout<<"c2=";
	c2.display();
	c3=c1+c2;
	cout<<"c1+c2=";
	c3.display();
	c3=c1-c2;
	cout<<"c1-c2=";
	c3.display();
	c3=c1*c2;
	cout<<"c1*c2=";
	c3.display();
	c3=c1/c2;
	cout<<"c1/c2=";
	c3.display();
	system("pause");
	return 0;
}
Complex Complex::operator+(Complex &c2)
{
	return Complex(real+c2.real,imag+c2.imag);
}
Complex Complex::operator-(Complex &c2)
{
	return Complex(real-c2.real,imag-c2.imag);
}
Complex Complex::operator*(Complex &c2)
{
	return Complex(real*c2.real-imag*c2.imag,real*c2.imag+imag*c2.real);
}
Complex Complex::operator/(Complex &c2)
{
	double a=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
	double b=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
	return Complex(a,b);
}
void Complex::display()
{
	cout<<real<<"+"<<imag<<"i"<<endl;
}

 

 

方案二：运用友元函数而不是成员函数，完成上面的运算符的重载。

 

#include <iostream>
using namespace std;
class Complex
{
public:
	Complex(){real=0;imag=0;}
	Complex(double r,double i){real=r;imag=i;}
	friend Complex operator +(Complex &c1,Complex &c2);
	friend Complex operator -(Complex &c1, Complex &c2);
	friend Complex operator *(Complex &c1, Complex &c2);
	friend Complex operator /(Complex &c1, Complex &c2);
	void display();
private:
	double real;
	double imag;
};
//下面定义成员函数

int main()
{
	Complex c1(3,4),c2(5,-10),c3;
	cout<<"c1=";
	c1.display();
	cout<<"c2=";
	c2.display();
	c3=c1+c2;
	cout<<"c1+c2=";
	c3.display();
	c3=c1-c2;
	cout<<"c1-c2=";
	c3.display();
	c3=c1*c2;
	cout<<"c1*c2=";
	c3.display();
	c3=c1/c2;
	cout<<"c1/c2=";
	c3.display();
	system("pause");
	return 0;
}
Complex operator+(Complex &c1,Complex &c2)
{
	return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
Complex operator-(Complex &c1,Complex &c2)
{
	return Complex(c1.real-c2.real,c1.imag-c2.imag);
}
Complex operator*(Complex &c1,Complex &c2)
{
	return Complex(c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c1.imag*c2.real);
}
Complex operator/(Complex &c1,Complex &c2)
{
	double a=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
	double b=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
	return Complex(a,b);
}
void Complex::display()
{
	cout<<real<<"+"<<imag<<"i"<<endl;
}

 

 

方案三：在方案二的基础上，拓展。

 

#include <iostream>
using namespace std;
class Complex
{
public:
	Complex(){real=0;imag=0;}
	Complex(double r,double i){real=r;imag=i;}
	friend Complex operator +(Complex &c1,double s);
	friend Complex operator -(Complex &c1,double s);
	friend Complex operator *(Complex &c1,double s);
	friend Complex operator /(Complex &c1,double s);
	void display();
private:
	double real;
	double imag;
};
//下面定义成员函数

int main()
{
	Complex c1(3,4),c3;
	double c2=2;
	cout<<"c1=";
	c1.display();
	cout<<"c2=";
	cout<<c2<<endl;
	c3=c1+c2;
	cout<<"c1+c2=";
	c3.display();
	c3=c1-c2;
	cout<<"c1-c2=";
	c3.display();
	c3=c1*c2;
	cout<<"c1*c2=";
	c3.display();
	c3=c1/c2;
	cout<<"c1/c2=";
	c3.display();
	system("pause");
	return 0;
}
Complex operator+(Complex &c1,double s)
{
	return Complex(c1.real+s,c1.imag+s);
}
Complex operator-(Complex &c1,double s)
{
	return Complex(c1.real-s,c1.imag-s);
}
Complex operator*(Complex &c1,double s)
{
	return Complex(c1.real*s,c1.imag*s);
}
Complex operator/(Complex &c1,double s)
{
	return Complex(c1.real/s,c1.imag/s);
}
void Complex::display()
{
	cout<<real<<"+"<<imag<<"i"<<endl;
}

 

 

总结：双目运算符的重载函数需要形参，单目运算符不需要。

         并且重载运算符识别是根据数据类型计算。