#include <iostream>
#include <string>
#include "ourCalculator.h"
using namespace std;



int main()
{
	calculator C;

	C.add(5.1);
	C.add(3.2);

	cout << C.display() << endl; //8.3

	C.add(20);
	C.add(21);
	C.add(21.1);  

	cout << C.display() << endl; //70.4
	C.undo();
	cout << C.display() << endl; //49.3

	C.undo();
	C.add(12.4);
	C.undo();
	C.undo();
	
	
	cout << C.display() << endl; //8.3





	return 0;
}