#16226: printf g format specifier doesn't match the C standard behaviour -------------------------------------+------------------------------------- Reporter: Fuuzetsu | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Core | Version: 8.6.3 Libraries | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{ [nix-shell:/tmp]$ clang printg.c && ./a.out && cat printg.c 3122.55 #include <stdio.h> int main(void) { printf("%.16g\n", 3122.55); } [nix-shell:/tmp]$ runhaskell printg.hs && cat printg.hs 3122.5500000000000000 import Text.Printf (printf) main = printf "%.16g\n" (3122.55 :: Double) }}} Some more info here https://stackoverflow.com/questions/54162152/what- precisely-does-the-g-printf-specifier-mean Notably I'd expect GHC to give me the same answer as the shown C program. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16226> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler