#14384: real numbers, digits after the decimal point - digits of precision -------------------------------------+------------------------------------- Reporter: vanto | Owner: (none) Type: feature request | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by hsyl20): * status: new => closed * resolution: => invalid Comment: Replying to vanto: It seems like you are new to Haskell (and to programming with floating- point numbers in general). `read . show` must be `id`. Do you understand the following code? {{{#!hs
read (show ((16.0/0.00002)**2.1)) - (((16.0/0.00002)**2.1) :: Double) 0.0 read "2.49166110385e12" - (((16.0/0.00002)**2.1) :: Double) 2.48828125 }}}
Use `printf` as suggested or [https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ghci.html#us... -custom-interactive-printing-function `-interactive-print` in GHCi]. Please use the haskell-beginners mailing-list to ask questions instead of GHC's bug tracker when you don't understand. You are not alone here. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14384#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler