[GHC] #14389: Improved results in GHCi during basic calculations

25 Oct 2017


      #14389: Improved results in GHCi during basic calculations
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           Reporter:  vanto          |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 We can use GHCi as a calculator using {{{+}}}, {{{-}}}, {{{*}}},
 {{{/}}}, {{{sin}}}, {{{cos}}}, and others.
 sometimes the result does not meet our expectations.
 for example if I calculate 3 + 2, the result is 5 and in line with our
 expectations. \\

 {{{
 Prelude> 3+2
 5
 }}}
 but sometimes it is not.\\
 for the two examples below, please, can we have in GHCi a result other
 than the one given?\\

 {{{
 Prelude> exp(log(1000)-log(10))
 99.99999999999996
 }}}
 can we have a result equal to {{{100}}}? \\

 {{{
 Prelude> 12*(1/3-1/4)-1
 -2.220446049250313e-16
 }}}
 can we have a result equal to {{{0}}}? \\

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14389
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler