$ perl -le 'printf "%.91f\n", 0.15;' 0.1499999999999999944488848768742172978818416595458984375000000000000000000000000000000000000 $ perl -le 'printf "%.91g\n", 0.15;' 0.14999999999999999 $ perl -le 'printf "%.92g\n", 0.15;' 0.1499999999999999944488848768742172978818416595458984375