On 12/21/05, Daniel Carrera wrote:

...

round sqrt(2) I don't understand why it dosn't work without brackets.

Function application is left associative in Haskell. -- regards, radu http://rgrig.blogspot.com/

Sigh... never fails. Spend an hour trying to solve a problem, and a minute after you write to the list you find the solution. I need brackets around sqrt. I'm surprised though. I don't understand why it dosn't work without brackets.

because "x y z" parses as "(x y) z", so "round sqrt 2" parses as "(round sqrt) 2" and "round sqrt" doesn't make sense. "x(y)" doesn't mean necessarily "apply y to x" as it does in C. parens only are used as they are in math to separate stuff. -- Hal Daume III | hdaume@isi.edu "Arrest this man, he talks in maths." | www.isi.edu/~hdaume

On Wed, Dec 21, 2005 at 06:10:56PM +0000, Daniel Carrera wrote:

Daniel Carrera wrote:

...

Hey,

The sqrt function is not doing what I want. This is what I want:

round sqrt(2)

Sigh... never fails. Spend an hour trying to solve a problem, and a minute after you write to the list you find the solution. I need brackets around sqrt. I'm surprised though. I don't understand why it dosn't work without brackets.

In Haskell parentheses are not part of function call syntax, unlike many languages like C, Pascal or Java. The role of parentheses in expressions is only for grouping and disambiguation. What you typed is actually equivalent to round sqrt 2 which in turn is equivalent to ((round sqrt) 2) because function application is left-associative. Best regards Tomasz -- I am searching for a programmer who is good at least in some of [Haskell, ML, C++, Linux, FreeBSD, math] for work in Warsaw, Poland

MG> () <- Parenthesis MG> {} <- Braces MG> [] <- Brackets MG> Sorry to be pedantic, but using the wrong terminology confuses me and MG> I'm sure others as well. This is true for Haskell, but Daniel is correct if he is calling () "Brackets" because they are, in British English, right? (Just like '.' is a 'period' in US, but it is a 'full stop' in UK.). Of course, English /= Haskell so in Haskell I guess they are called Parenthesized Expressions (in the Haskell report http://www.haskell.org/onlinereport/exps.html). To be extra pedantic, I would call {} Curly Braces (or Curly Brackets, or squiggly brackets, or squiggles, or ... just use layout and whitespace!) and I would call [] Square Brackets. Then no one gets confused. Cheerio, Jared P.S. IANAA = I am an American, so I could very well be wrong about British English!

On 12/21/05, Daniel Carrera wrote:

...

Daniel Carrera wrote:

...

Hey,

The sqrt function is not doing what I want. This is what I want:

round sqrt(2)

Sigh... never fails. Spend an hour trying to solve a problem, and a minute after you write to the list you find the solution. I need brackets around sqrt. I'm surprised though. I don't understand why it dosn't work without brackets.

Daniel. -- /\/`) http://oooauthors.org /\/_/ http://opendocumentfellowship.org /\/_/ \/_/ I am not over-weight, I am under-tall. / _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

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