Absurd result. Where is the problem?

Please run the attached file and look at the values of dddd, dddd1 and dddd2. Value of dddd1 is expected to be 0. But it shows an absurd result (dddd1 = 1/750599937895083). Where is the problem?

[Azzi Abdelmalek]

There is no attached file

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F