// con1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <math.h>

using namespace std;

int main()
{
	float x = 0.1;
	x += 0.1;
	x += 0.1;
	x += 0.1;
	// if (x==0.4) would be wrong due to rounding errors.

	// fabs(y)       |y|       needs math.h
	if (fabs(x - 0.4) < 1e-6)
		cout << "yes" << endl;

	return 0;
}