//float.cpp
//floating point in boolean expressions
#include <iostream>
#include <cmath>    //needed for fabbs function
using namespace std;

int main()
{
   float x; 
   float y; 
   x = 1.0/3.0; 
   y = 1.0; 

   if (3.0*x == y)                //false! 
      cout << "first if\n";

   if (fabs( 3.0*x - y) < 0.00001) //true
      cout << "second if\n";

   system("pause");
   return 0;
}