[Haskell-beginners] turning a value into an expression

[Brent Yorgey]

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