题目描述：建立一个复数类，实数和虚数是其私有数据成员。建立一个>（大于号）的运算符重载，比较两个复数间模的大小。tip:输入可以不为整数

#include <iostream>
#include <math.h>
#include <iomanip>
using namespace std;
class rl
{
	private:
		double x,y;
	public:
		void set(double n=0,double m=0)
		{
			x=n;y=m;
		}
		
		friend rl operator>(rl &a,rl &b);
};
rl operator>(rl &a,rl &b)
{
	double value1=sqrt(a.x*a.x+a.y*a.y);
	double value2=sqrt(b.x*b.x+b.y*b.y);
	if(value1>value2){cout<<"true"<<endl;}
	else{cout<<"false"<<endl;}
}
int main()
{
	double n1,m1,n2,m2=0;
	for(;;)
	{
		cin>>n1>>m1>>n2>>m2;
		if(n1==0&&n2==0&&m1==0&&m2==0){break;}
		
		rl r1,r2,r3;
		r1.set(n1,m1);r2.set(n2,m2);r3.set();
		r1>r2;
				
	}
	return 0;
}