Fix #222: Wrong result for e.g. √(2.25) - 1.5 #222 (#2424) * add snap zero in add/sub/log * add a comment * Update src/CalcManager/Ratpack/exp.cpp Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update src/CalcManager/Ratpack/rat.cpp Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update src/CalcManager/Ratpack/rat.cpp Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>