Overload ( operator overloading) 예제

연산자 오버로딩 예제 

사칙연산(+-*/) ,(+=,-=,*=,/=) , 비교연산 (<>) , 전위 후위 상승 연산자 (++ --) 구현 완료

좌표값과 좌표값 사칙연산가능

상수값과 좌표값 사칙연산가능

비교연산 좌표값과 좌표값간의 비교연산 가능

#include<cstdio>

#include<cstring>
#include<ctime>
#include<cmath>



class Point3 {

public:
	int x;
	int y;
	int z;

	Point3(int x, int y,int z) {
		this->x = x;
		this->y = y;
		this->z = z;
	}


	//print point
	void print_point() {
		printf("(%d , %d, %d) \n", this->x,this->y,this-> z);
	}
	
	//vector ABS  벡터의 절대값
	float volume() {
		return (float)sqrt(x*x + y*y+z*z);
	}

	bool operator<(Point3& p) {
		return volume() < p.volume();
	}
	bool operator>(Point3& p) {
		return volume() > p.volume();
	}


	// point + number
	Point3 operator+(int n) {
		return Point3(x+n,y+n,z+n);
	}
	Point3 operator*(int n) {
		return Point3(x * n, y * n, z * n);
	}	
	Point3 operator/(int n) {
		return Point3(x / n, y / n, z / n);
	}	
	Point3 operator-(int n) {
		return Point3(x - n, y - n, z - n);
	}
	
	


	// point + point
	Point3 operator+(Point3& p) {
		return Point3(x + p.x, y + p.y, z + p.z);
	}
	Point3 operator-(Point3& p) {
		return Point3(x - p.x, y - p.y, z - p.z);
	}
	Point3 operator*(Point3& p) {
		return Point3(x * p.x, y * p.y, z * p.z);
	}
	Point3 operator/(Point3& p) {
		return Point3(x / p.x, y / p.y, z / p.z);
	}


	Point3 operator++() {
	
		x = x + 1;
		y = y + 1;
		z = z + 1;
		return (*this);
	}
	//Prefix operator
	Point3 operator++(int) {
		Point3 p = Point3(x, y,z);
		x = x + 1;
		y = y + 1;
		z = z + 1;
		return p;
	}
	//Postfix operator
	Point3 operator--() {
		Point3 p = Point3(x, y,z);
		x = x - 1;
		y = y - 1;
		z = z - 1;
		return (*this);
	}
	// Prefix operator
	Point3 operator--(int) {
		Point3 p = Point3(x, y, z);
		x = x - 1;
		y = y - 1;
		z = z - 1;
		return p;
	}
	//Postfix operator

	Point3 operator+=(int a) {
		Point3 p = Point3(x, y, z);
		x = x + a;
		y = y + a;
		z = z + a;
		return p;
	}
	Point3 operator-=(int a) {
		Point3 p = Point3(x, y,z);
		x = x - a;
		y = y - a;
		z = z - a;
		return p;
	}
	Point3 operator*=(int a) {
		Point3 p = Point3(x, y,z);
		x = x * a;
		y = y * a;
		z = z*a;
		return p;
	}
	Point3 operator/=(int a) {
		Point3 p = Point3(x, y,z);
		x = x / a;
		y = y / a;
		z = z / a;
		return p;
	}

};

//global operator overloading
Point3 operator+(int n,Point3& p) {
	return Point3(p.x + n, p.y + n,p.z+n);
	
}
Point3 operator-(int n, Point3& p) {
	return Point3(p.x - n, p.y - n,p.z-n);

}
Point3 operator*(int n, Point3& p) {
	return Point3(p.x * n, p.y * n,p.z*n);

}
Point3 operator/(int n, Point3& p) {
	return Point3(p.x / n, p.y / n,p.z/n);

}


#include"Header.h"

int main() {
	Point3 p1 = Point3(10, 20,10);
	Point3 p2 = Point3(30, 40,30);

	p1 = p1 * 2;
	p1.print_point();
		p1 = p1 + 2;
	p1.print_point();
	
	p1 = p1 - 2;
	p1.print_point();

	p1 = p1 / 2;
	p1.print_point();
	

	Point3 p3 = p1 + p2;

	p3.print_point();
	
	p3 = p1-p2;
	p3.print_point();
	p3 = p1*p2;
	p3.print_point();
	p3 = p1/p2;
	p3.print_point();

	fgetc(stdin);
	return 0;
}

Header.h

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