FP Laboratory 1

Working environment

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

How to verify it is working?

• 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 + 'a'

It should report a problem in function plus (you can not use + with letter, it can be repaired by removing + 'a'). Report from VS Code is refreshed whenever the source file is saved on disk.

First program in Haskell

In your favorite development environment (VS Code by default):

• Crate a file simple.hs.
• Create a function pythagoras a b that computes c based on $c^{2}=a^{2}+b^{2}\,,$.