Personal tools

Cookbook/Interactivity

From HaskellWiki

< Cookbook
Revision as of 09:04, 2 August 2009 by Lenny222 (Talk | contribs)

Jump to: navigation, search
Problem Solution Examples
printing a string putStr
Prelude> putStr "Foo"
FooPrelude>
printing a string in a new line putStrLn
Prelude> putStrLn "Foo"
Foo
reading a string getLine
Prelude> getLine
Foo bar baz          --> "Foo bar baz"

1 Printing a string

Strings can be output in a number of different ways.

Prelude> putStr "Foo"
FooPrelude>

As you can see, putStr does not include the newline character `\n'. We can either use putStr like this:

Prelude> putStr "Foo\n"
Foo

Or use putStrLn, which is already in the Standard Prelude

Prelude> putStrLn "Foo"
Foo

We can also use print to print a string, including the quotation marks.

Prelude> print "Foo"
"Foo"

2 Parsing command line arguments

TODO