#include <iostream>
#include <iomanip>

int main ( void )
{
	volatile double d = 0.00000001;
	volatile double a = 90;
	volatile double b = a + d;
	volatile double c = b - a;

	std::cout << std::setprecision(15) << "a = " << a << std::endl;
	std::cout << std::setprecision(15) << "b = " << b << std::endl;
	std::cout << std::setprecision(15) << "c = " << c << std::endl;
	std::cout << std::setprecision(15) << "d = " << d << std::endl;
	std::cout << "b == d -> " << (b == d) << std::endl;


	return 0;
}