UnEthical Overloading

unethical.cpp

#include <iostream>

class ovt {
private:
	int num;
public:
	ovt(int n = 1):num(n){}
	operator int(){
		return num;
	}
	ovt operator+(ovt o){
		return (num-o.num);
	}
};

int main(){
	ovt o1(10), o2(5);
	std::cout<<static_cast<int>(o1+o2)<<std::endl;
	return 0;
}

Ah, yes! I hadn't think about default parameters