Sorry about such lame questions. I'm currently using Haskell 'in anger' for the first time, so differences with other functional languages are biting me occasionally. I need to convert Ints to Strings and vice-versa. What's the best way to do this? I've not found library functions for this. Second question: Using division over integers. I appreciate that a division operator with integers as arguments can not be guaranteed to return an exact integer result. However, if I *do* want to do integer division, how should I do it? Is floor(a/b) appropriate? TIA Sarah Thompson
I need to convert Ints to Strings and vice-versa. What's the best way to do this? I've not found library functions for this.
Read and Show. Hmm... should have tried that before posting. :) My second question about integer division still stands, however. Thanks, Sarah
On Thu, 23 Jan 2003, Sarah Thompson wrote:
I need to convert Ints to Strings and vice-versa. What's the best way to do this? I've not found library functions for this.
Use read and show. Prelude> show 23 "23" Prelude> read "23" :: Int 23 (Type annotation needed on the second example because read and show are overloaded. Normally type information from the context is sufficient to fix the type, but when you call read at the top level like this, there is no contextual information. You can use read and show for most built-in types, and also for your own types if you add "deriving (Read,Show)" to your datatype definitions).
Second question:
Using division over integers. I appreciate that a division operator with integers as arguments can not be guaranteed to return an exact integer result. However, if I *do* want to do integer division, how should I do it? Is floor(a/b) appropriate?
No. There is an operator for this: div. Prelude> 7 `div` 3 2 John
participants (2)
-
John Hughes -
Sarah Thompson