Operator Overloading for '+' , '- ' and '='.

OperatorOverloadingInC++.cpp

// Q. Write a program with class Distance to realize following main method.
// [Internal 2018 Spring - GCES]


#include<iostream>
using namespace std;

class Distance{
private:
	int cm;
public:
	Distance():cm(0){}
	Distance(int c):cm(c){}

	Distance operator + (int);
	void operator = (Distance);
	void operator = (int);
	int operator - (int);
	void display();
};

Distance Distance :: operator +(int another){
	Distance temporary;
	temporary.cm  = this->cm  + another;
	return temporary;
}

void Distance :: operator =(Distance another){
	this->cm  = another.cm;
}

void Distance :: operator = (int another){
	this->cm = another;
}

int Distance :: operator - (int another){
	int temporary;
	temporary = this->cm - another;
	return temporary;
}

void Distance ::  display(){
	cout << cm;
}

int main(){
	Distance d1 = 202;	// 200 is cm
	Distance d2 = d1 + 333; // 333 is cm

	cout << "sum is " << endl;
	d2.display();

	int diff = d1 -22; // diff is in cm
	cout << "difference is " << endl;
	cout << diff;

	return 0;
}