Question

c++程序编写：声明point类，对其重载运算符“+”、“—”。

Answer 1

重载“-”和“+”一样。我这里就只写重载“+”的代码了
一个参数的，即把重载函数声明为成员函数
#include<iostream>

using namespace std;

class point
{
public:

point(int a,int b):x(a),y(b){}
point operator +(point &p2);
void show()
{
cout<<x<<","<<y<<endl;
}
private:
int x;
int y;
};

point point:: operator+( point &p2)
{
return point(x + p2.x, y + p2.y);

}
两个参数时，即把成员函数声明为友元函数
#include<iostream.h>
class point
{
public:

point(int a,int b):x(a),y(b){}
friend point operator +(point p1 , point p2);
void show()
{
cout<<x<<","<<y<<endl;
}
private:
int x;
int y;
};

point operator+(point p1 , point p2)
{
return point(p1.x + p2.x, p1.y + p2.y);

}

int main()
{
point c1(2,3),c2(5,6);

c1=c1+c2;
c1.show ();

return 0;
}

Answer 2

重载“-”和“+”一样。我这里就只写重载“+”的代码了
一个参数的，即把重载函数声明为成员函数
#include<iostream.h>
class point
{
private:
int x;
int y;
public:
point(int a,int b):x(a),y(b)
{}
point operator +(point &p2);
void show()
{
cout<<x<<","<<y<<endl;
}
};

point point:: operator+( point &p2)
{
return point(x + p2.x, y + p2.y);

}
两个参数时，即把成员函数声明为友元函数
#include<iostream.h>
class point
{
private:
int x;
int y;
public:
point(int a,int b):x(a),y(b)
{}
friend point operator +(point p1 , point p2);
void show()
{
cout<<x<<","<<y<<endl;
}
};
point operator+(point p1 , point p2)
{
return point(p1.x + p2.x, p1.y + p2.y);

}

int main()
{
point c1(2,3),c2(5,6);

c1=c1+c2;
c1.show ();

return 0;

Answer 3

fxtux