Le 13/07/2011 21:27, Roelof Wobben a écrit :

For a exercise I need to multiply a number by itself.

So I used :

[x^2 | x<- [1..100]]

but now I get a error message on codepad that ^is unknown. What can I use then and where do I find it on a keyboard?

Roelof

Hello, What does codepad not recognize? the caret character or the expression you used? ghci 7.0.3 gives me this: Prelude> [x**2 | x <- [1..10]] [1.0,4.0,9.0,16.0,25.0,36.0,49.0,64.0,81.0,100.0] Prelude> [x^2 | x <- [1..10]] [1,4,9,16,25,36,49,64,81,100] Did you try it on ghci or in a text file? I guess we need more details if the former. Which version of ghci do you have? What is your OS? Regards, Adrien