Difference between revisions of "Cookbook/Interactivity"

Revision as of 09:00, 2 August 2009

Problem	Solution	Examples
reading a string	getLine	Prelude> getLine Foo bar baz --> "Foo bar baz"

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"

TODO

@@ Line 1: / Line 1: @@
+{| class="wikitable"
-== Reading a string ==
+|-
-Strings can be read as input using [http://haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#v%3AgetLine getLine].
+!  Problem
-<haskell>
+!  Solution
+!  Examples
+|-
+|  reading a string
+|  [http://haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#v%3AgetLine getLine]
+|<haskell>
 Prelude> getLine
-Foo bar baz
+Foo bar baz          --> "Foo bar baz"
-"Foo bar baz"
 </haskell>
+|}
 == Printing a string ==