C++-結構體

#include<cstdio>
#include<iostream>
#include<algorithm>//system()
using namespace std;
struct point {
	int x,y;//① 
	
	//構造函數 
	point(int x=0,int y=0){//可以初始化爲0 直接調用point（）則默認初始化爲相應值 
		this->x=x;//指向當前成員變量的指針 既①中的x,y 
		this->y=y;
	}
	
	//構造函數也可簡寫爲  	point(int x=0,int y=0):x(x),y(y) {} 既 point(int a=0,int b=0):x(a),y(b) {} 
};

//定義加法  注意不能用 +=   const與&可省略 
point operator + (const point& a,const point& b){
	return point(a.x+b.x,a.y+b.y);
} 

//輸出 ostream後面的&不能省略！ 
ostream& operator << (ostream& out,const point& p){
	out<<"("<<p.x<<","<<p.y<<")";
	return out;
}
int main(){
	cout<<point(1,2).x;
	cout<<point(1,2).y;
	
	cout<<(point(1,2)+point(3,4)).x;
	cout<<(point(1,2)+point(3,4)).y;
	
	cout<<(point(1,2)+point(3,4));
	system("pause");
	return 0;
}