How to Convert Type in Tuples

Posted by Pradeep on Stack Overflow See other posts from Stack Overflow or by Pradeep
Published on 2010-03-18T07:55:22Z Indexed on 2010/03/18 8:01 UTC
Read the original article Hit count: 467

Filed under:

haskell

|

conversion

how to convert a String type to a Int

i have a tuple and i want to convert it to a tuple which has different types

tupletotuple :: (String,String,String) ->(String,Int,Int)
tupletotuple (a,b,c) = (a,read(b),read(c))

i get this Error Msg

Project> tupletotuple ("cha",4,3) ERROR - Cannot infer instance * Instance : Num [Char] * Expression : tupletotuple ("cha",4,3)

© Stack Overflow or respective owner

Related posts about haskell

Learning Haskell: How to remove an item from a List in Haskell

as seen on Stack Overflow - Search for 'Stack Overflow'
Trying to learn Haskell. I am trying to write a simple function to remove a number from a list without using built-in function (delete...I think). For the sake of simplicity, let's assume that the input parameter is an Integer and the list is an Integer list. Here is the code I have, Please tell me… >>> More
Using Data.Heap in Haskell, or reading Haskell docs for a beginner

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to use Haskells Data.Heap module, but I'm incapable of even using it with integers. The only heap I've been capable of using is "empty", which does not take any arguments. Later on I'll figure out how to instance for my needs, but for now I'd be glad if I was even able to test it with… >>> More
What kind of things are easy in Haskell and hard in Scala, and vice versa?

as seen on Programmers - Search for 'Programmers'
There has been some intermingling of Scala and Haskell communities, and I have noticed now and then people commenting on stuff that's supposed to be easy in Haskell and hard and Scala. Less often (maybe because I read Scala questions, not Haskell ones), I see someone mentioning that something in Scala… >>> More
Haskell's cabal dependency problem with happy

as seen on Programmers - Search for 'Programmers'
I have problems installing ghc-mod on my linux machine. cabal worries about "happy" not being available in versione = 1.17: $ cabal install ghc-mod Resolving dependencies... [1 of 1] Compiling Main ( /tmp/haskell-src-exts-1.14.0-1357/haskell-src-exts-1.14.0/Setup.hs, /tmp/haskell-src-exts-1… >>> More
Understanding Haskell's fibonacci

as seen on Stack Overflow - Search for 'Stack Overflow'
fibs :: [Int] fibs = 0 : 1 : [ a + b | (a, b) <- zip fibs (tail fibs)] This generates the Fibonacci sequence. I understand the behaviour of the guards, of :, zip and tail, but I don't understand <-. What is it doing here? >>> More

Related posts about conversion

Conversion constructor vs. conversion operator: precedence

as seen on Stack Overflow - Search for 'Stack Overflow'
Reading some questions here on SO about conversion operators and constructors got me thinking about the interaction between them, namely when there is an 'ambiguous' call. Consider the following code: class A; class B { public: B(){} B(const A&) //conversion constructor … >>> More
Conversion of bytes into a type without changing the application (ie storing the conversion method i

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a way to store a conversion strategy (for converting some bytes) into a database and then execute it on the run time. If one were to store a complete java file, you would need to compile it, store the class and some how inject into the already running system. I am not sure how this would… >>> More
General type conversion without risking Exceptions

as seen on Stack Overflow - Search for 'Stack Overflow'
I am working on a control that can take a number of different datatypes (anything that implements IComparable). I need to be able to compare these with another variable passed in. If the main datatype is a DateTime, and I am passed a String, I need to attempt to convert the String to a DateTime… >>> More
Create a Unit Conversion Application with the Zend_Measure Component

as seen on Internet.com - Search for 'Internet.com'
Learn how to create a simple conversion calculator using the Zend Framework's Zend_Measure component ... >>> More
Create a Unit Conversion Application with the Zend_Measure Component

as seen on Internet.com - Search for 'Internet.com'
Learn how to create a simple conversion calculator using the Zend Framework's Zend_Measure component ... >>> More