Overflow-detecting conversion from String to Int in Haskell [duplicate]

Question

The read function is useful for converting String to Int, but it does not support error handling. Especially, it silently returns an incorrect value when the string value is too large to be represented as Int:

> read "123456789012345678901234567890" :: Int
-4362896299872285998

How can I check if the string value is between minBound :: Int and maxBound :: Int and thus correctly converted to Int? Is there an overflow-detecting conversion function that returns Maybe Int or something?

Eugene Sh. · Accepted Answer · 2017-05-11 15:19:54Z

5

You can convert it first to Integer, and perform the comparison:

> (read "123456789012345678901234567890" :: Integer) > toInteger(maxBound::Int)
True

answered May 11, 2017 at 15:19

Eugene Sh.

18.7k8 gold badges45 silver badges69 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Overflow-detecting conversion from String to Int in Haskell [duplicate]

1 Answer 1

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Linked

Related