https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110749
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- Your program is using the default precision for printing a double: 6 significant figures. 101.92249999999999943 with 6 digits of precision is 101.922 (because (24 rounds to 2). 101.92249999999999943 with 7 digits of precision is 101.9225 (because 49 rounds to 5). If you use std::setprecision(7) << std::abs(value) you will get 101.9225: 000000000090.8425 000000000101.9225 If you use std::setprecision(17) you will get the same values as GDB shows: 090.842500000000001 000000000101.9225 If you use std::setprecision(18) you'll see that Andreas is correct: 090.8425000000000011 0101.922499999999999 This is not a GCC bug, this is just how floating-point numbers work.
