Re: [Haskell-beginners] turning a value into an expression

On Mon, Nov 09, 2009 at 10:05:43PM +0000, John Moore wrote:

Hi, How do I turn a value into an expression I want to do for e.g. 8 - 1 turn it into (subtract (Val8) (Val1)

Any ideas

Is this a homework problem? One good approach would be to make a data type Expr which represents expressions. It will have a constructor Val, a constructor Subtract, etc., one constructor for each operation you want to have in your expressions. Then make Expr an instance of the Num type class. -Brent