4-1 复数类的运算符重载



4-1 复数类的运算符重载

Time Limit: 1000MS Memory Limit: 65536KB

Submit Statistic

Problem Description

通过本题目的练习可以掌握成员运算符重载及友元运算符重载

要求定义一个复数类，重载加法和减法运算符以适应对复数运算的要求，重载插入运算符(<<)以方便输出一个复数的要求。

Input

 

要求在主函数中创建对象时初始化对象的值。

Output

 

输出数据共有4行，分别代表a，b的值和它们求和、求差后的值

Example Input

无

Example Output

a=3.2+4.5i
b=8.9+5.6i
a+b=12.1+10.1i
a-b=-5.7-1.1i

#include<iostream>
using namespace std;
class complex
{
private:
	double x, y;
public:
	complex(double a, double b) :x(a), y(b){};
	complex operator +(complex &t);
	complex operator -(complex &t); //运算时默认 t1.operator -(complex t2)
	friend ostream& operator <<(ostream&,complex &t); //输入输出的重载只能以友元函数的形式重载
};
complex complex::operator+(complex &t)
{
	return complex(x + t.x, y + t.y);
}
complex complex::operator-(complex &t)
{
	return complex(x - t.x, y - t.y);
}
ostream & operator <<(ostream & output,complex &t) //注意这里的output、ostream
{
	if (t.y<0)
		output << t.x << t.y << 'i' << endl;
	else if (t.y==0)
		output << t.x << endl;
	else
		output << t.x << '+' << t.y << 'i' << endl;
	return output;
}
int main()
{
	complex t1(3.2, 4.5), t2(8.9, 5.6);
	cout << "a="<<t1;
	cout << "b="<<t2;
	complex t3=t1+t2; //要新建一个变量储存数值
	cout << "a+b=" << t3;
	t3=t1-t2;
	cout << "a-b=" << t3;
	return 0;
}