Haskell Cookbook

How to do it...

1. Create a new project exceptions with the simple Stack template.
2. Open src/Main.hs and edit it.
3. After the module declaration, add the following imports for Exception and for doing IO:

        import qualified Control.Exception as E
        import System.IO

4. We will write a function div1 to divide one integer by another. However, when we encounter the division by zero situation, we use the error :: String -> a function to raise an error. This function takes and raises SomeException:

        div1 :: Int -> Int -> Int
        div1 x 0 = error "Division by zero"
        div1 x y = x `div` y

5. Now, we will write safeDiv1 and safeDiv2 , which will catch the exception and will safely show the result of the division:

 safeDiv1 :: Int -> Int -> IO () safeDiv1 x y = E.catch ...