Difference between revisions of "FP Laboratory 9"
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(Created page with "== User defined data types and type classes == Consider following representation of expressions <syntaxhighlight lang="Haskell"> data Expr = Num Int | Add Expr Exp...") |
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| Line 5: | Line 5: | ||
data Expr = Num Int | data Expr = Num Int | ||
| Add Expr Expr | | Add Expr Expr | ||
| − | + | | Sub Expr Expr | |
| − | + | | Mul Expr Expr | |
| − | + | | Div Expr Expr | |
| − | + | | Var Char | |
deriving (Eq) | deriving (Eq) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 12:10, 18 September 2019
User defined data types and type classes
Consider following representation of expressions
data Expr = Num Int
| Add Expr Expr
| Sub Expr Expr
| Mul Expr Expr
| Div Expr Expr
| Var Char
deriving (Eq)
- Create function eval that evaluates expresions.
- Create function showExpr that shows expression as a String.
- Extend class Show to be usable with our expressions.
- Create function derivation representing symbolic derivation of a given expression.
