On 05/02/2019, John R. Strohm <strohm at airmail.net> wrote: > Floating-point numbers are not exact. > > No matter how closely they may round, no matter how close they look, they > may not be exactly equal. So true. Goldberg is considered the definitive essay: https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html N.