[C++知识库]C++两个复数的加减乘运算

【问题描述】定义复数类,实现+,-,*运算符,实现两个复数的加减乘运算.
【输入形式】输入两个复数的实部和虚部
【输出形式】提示信息:"please input two complex numbers:"
【样例输入】3? ?4?

? ? ? ? ? ? ? ? ? ? ?10? ?-2.9
【样例输出】please input two complex numbers:?3? 4?

? ? ? ? ? ? ? ? ? ? ???10? -2.9 (横线数据为输入数据)

? ? ? ? ? ? ? ? ? ? ?c1 is 3+4i

? ? ? ? ? ? ? ? ? ? ?c2 is 10-2.9i

?????????????????????c1+c2=13+1.1i

????????????????? ? ? c1-c2=-7+6.9i

????????????????????? c1*c2=41.6+31.3i?

//两个复数的加减乘运算
#include<iostream>
using namespace std;
class fs
{
	private:
		double real;
		double vir;
	public:
		fs();
		friend fs operator+(fs a1, fs a2);
		friend fs operator-(fs a1, fs a2);
		friend fs operator*(fs a1, fs a2);//重载加减乘运算
	    void input();//输入函数 
        void display();//输出函数  
};
fs::fs()
{
	real=0;
	vir=0;
 } 
fs operator+(fs a1, fs a2)
{
	fs a3;
	a3.real=a1.real+a2.real;
	a3.vir=a1.vir+a2.vir;
	return a3;
}
fs operator-(fs a1, fs a2)
{
	fs a3;
	a3.real=a1.real-a2.real;
	a3.vir=a1.vir-a2.vir;
	return a3;
}
fs operator*(fs a1, fs a2)
{
	fs a3;
	a3.real=a1.real*a2.real-a1.vir*a2.vir;
	a3.vir=a1.vir*a2.real+a1.real*a2.vir;
	return a3;
}//重载加减乘运算
void fs::input()//输入函数
{
	cin>>real>>vir;
}
void fs::display()//输出函数
{
	if(real!=0)
	{
		if(vir>0)cout<<real<<"+"<<vir<<"i"<<endl;
		if(vir==0)cout<<real<<endl;
		if(vir<0)cout<<real<<vir<<"i"<<endl;
	}
	if(real==0)
	{
		if(vir>0)cout<<vir<<"i"<<endl;
		if(vir==0)cout<<"0"<<endl;
		if(vir<0)cout<<vir<<"i"<<endl;
	}
}
int main()
{
	fs c1,c2,c3,c4,c5;
	cout<<"please input two complex numbers:"<<endl;
    c1.input();
	c2.input();
	cout<<"c1 is ";
	c1.display();
	cout<<"c2 is ";
	c2.display();
	c3=c1+c2;
	cout<<"c1+c2=";
	c3.display();
	c4=c1-c2;
	cout<<"c1-c2=";
	c4.display();
	c5=c1*c2;
	cout<<"c1*c2=";
	c5.display();
	return 0;
}