Difference between revisions of "FP Laboratory 1"

Revision as of 12:14, 28 August 2019

Using the installation guide from Functional programming prepare your working environment.

Run ghci from the command line. it will start GHC Interpreter, the output should be something like this:

GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help
Prelude>

If you write expression, for example 1+2*3, it should be evaluated. You can close this interpreter by typing :q.
Open Visual Studio Code, create a file simple.hs and put there following lines of code:

doubleMe x = x * x

plus x y  = x + y

@@ Line 13: / Line 13: @@
 </syntaxhighlight >
 <translate>
-*If you write expression, for example <code>1+2*3</code>,  it should be evaluated. You can close this interpreter by typing<code>:q</code>.
+*If you write expression, for example <code>1+2*3</code>,  it should be evaluated. You can close this interpreter by typing <code>:q</code>.
+*Open Visual Studio Code, create a file <code>simple.hs</code> and put there following lines of code:
-== Topic ==
+</translate>
 <syntaxhighlight lang="Haskell" >
-ghci> :l baby
+doubleMe x = x * x
-[1 of 1] Compiling Main             ( baby.hs, interpreted )
-Ok, modules loaded: Main.
-ghci> doubleMe 9
-
-ghci> doubleMe 8.3
-.6
-ghci> 2 + 15
+plus x y  = x + y
-
-ghci> 49 * 100
-
-ghci> 1892 - 1472
-
-ghci> 5 / 2
-.5
 </syntaxhighlight >
-<syntaxhighlight lang="Haskell" class="myDark" >
+<translate>
-ghci> import Prelude
-doubleSmallNumber x = if x > 100
-                        then x
-                        else x*2
-ghci> [1,2,3,4] ++ [9,10,11,12]
-[1,2,3,4,9,10,11,12]
-ghci> "hello" ++ " " ++ "world"
-"hello world"
-ghci> ['w','o'] ++ ['o','t']
-"woot"
-multThree :: (Num a) => a -> a -> a -> a
-multThree x y z = x * y * z
-</syntaxhighlight >
 </translate>