The following output seems to be wrong:(format nil "~G" 1.0d0) "1.0 " I expect it to be "1. " For the formula in CLHS "22.3.3.3 Tilde G: General Floating-Point" I arrive at q=0, n=1, d=1, dd=0 where dd stands for the number of decimals to print. Allegro, ECL, SBCL agree with this. Kind regards, Willem