#include<iostream>
using namespace std;
class vector{
private:
double x;
double y;
public:
vector(){x=0.0;y=0.0;}
vector(double a,double b){x=a;y=b;}
vector add(vector p,vector q);
void print(void);
double getx(void){return x;}
double gety(void){return y;}
};
void vector::print(void){
cout<<"(x,y)=("<<x<<","<<y<<")"<<endl;
}
vector vector::add(vector p,vector q){
vector temp(0,0);
temp.x=(p.x)+(q.x);
temp.y=(p.y)+(q.y);
return temp;
}
ヘッダファイルをこう書いて・・・