클래스 Accumulator(값 누적)

#include <iostream>
using namespace std;

class Accumulator {
	int value;
public:
	Accumulator(int value) { this->value = value; };
	Accumulator& add(int n);
	int get() { return value; };

};

Accumulator& Accumulator::add(int n) {
	value += n;
	return *this;
}

int main() {
	Accumulator acc(10);
	acc.add(5).add(6).add(7);
	cout << "< 값을 누적하는 프로그램 >" << endl;
	cout << acc.get() << endl;
}