// FloatRoundErr.java: shows that float does not represent the value exactly.

class FloatRoundErr
{
   public static void main(String[] arg)
   {
      // *******************************************
      // Demo computation in float representation
      // *******************************************
      float f1, f2;

      f1 = 0.2f + 0.2f + 0.2f + 0.2f + 0.2f 
         + 0.2f + 0.2f + 0.2f + 0.2f + 0.2f;    
      f2 = 2.0f;

      System.out.println ("Float test result:");
      System.out.println ("==================");
      System.out.println ("f1 = " + f1);
      System.out.println ("f2 = " + f2);

      // Bad idea to test floating value for equality
      if (f1 == f2)
      { 
         System.out.println ("f1 == f2");
      }
      else
      { 
         System.out.println ("f1 != f2");
      }

      // This is the way to test if float value are more or less equal...
      if (Math.abs(f1-f2) < 0.0001)
      { 
         System.out.println ("f1 is approximately equal to f2");
      }
      else
      { 
         System.out.println ("f1 is very different from f2");
      }
   }
}