#include <iostream>
 #include <algorithm>
 using namespace std;
 /**
    Tests whether two floating-point numbers are 
    approximately equal.
    @param x a floating-point number
    @param y another floating-point number
    @return true if x and y are approximately equal
 */
 bool approx_equal(double x, double y)
 {  const double EPSILON = 1E-14;
    if (x == 0) return fabs(y) <= EPSILON;
    if (y == 0) return fabs(x) <= EPSILON;
    return fabs(x - y) / max(fabs(x), fabs(y)) <= EPSILON;
 }
 
 int main()
 {  double x;
    cout << "Enter a number: ";
    cin >> x;
 
    double y;
    cout << "Enter another number: ";
    cin >> y;
 
    if (approx_equal(x, y))
       cout << "The numbers are approximately equal.\n";
    else
       cout << "The numbers are different.\n";
    return 0;
 }