That’s only formatting.

The other (and more important) matter, — that is not even mentioned, — is comparison. E. g. in “rational by default in this specific case” languages (Perl 6),

  > 0.1+0.2==0.3
  True

Or, APL (now they are floats there! But comparison is special)

      0.1+0.2
  0.3
      ⎕PP←20 ⋄ 0.1+0.2
  0.30000000000000004
      (0.1+0.2) ≡ 0.3
  1