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I suggest this edit; which indirectly answers a comment i.e. what is this; and provides some more interesting examples...

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edit approved Nov 23, 2014 at 23:32

user44370

$> ghc -e '20 + 5'
25
it :: Integer

Also ghci, that is the Glasgow-Haskell Compiler in interactive mode (ghc --interactive, as opposed to it evaluating an expression with -e), makes for a fascinating "calculator":

$>ghci
GHCi, version 7.8.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> pi
3.141592653589793
Prelude> ceiling pi
4
Prelude> compare 1 2
LT

$> ghc -e '20 + 5'
25
it :: Integer

$> ghc -e '20 + 5'
25
it :: Integer

Also ghci, that is the Glasgow-Haskell Compiler in interactive mode (ghc --interactive, as opposed to it evaluating an expression with -e), makes for a fascinating "calculator":

$>ghci
GHCi, version 7.8.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> pi
3.141592653589793
Prelude> ceiling pi
4
Prelude> compare 1 2
LT

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answered Jun 15, 2012 at 7:05

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$> ghc -e '20 + 5'
25
it :: Integer