Extract file extension: Difference between revisions

Content added Content deleted

Inline

@@ Line 1: / Line 1: @@
 {{draft task}}
+{{task heading}}
-Write a program that takes one string argument representing the path to a file and returns the file's extension, or the null string if the file path has no extension.
+Write a function or program that
-An extension appears after the last period in the file name and consists of one or more letters or numbers.
+* takes one string argument representing the path/URL to a file
+* returns the file's extension, or an empty string if it has no extension.
+{{task heading|Details}}
-Show here the action of your routine on the following examples:
+* An extension appears after the last period in the file's name, and consists of one or more letters or numbers.
-# picture.jpg returns .jpg
+* The file name is separated from preceding directory parts, if any, by a forward slash.
-# <nowiki>http://mywebsite.com/picture/image.png</nowiki> returns .png
-# myuniquefile.longextension returns .longextension
+{{task heading|Test cases}}
-# IAmAFileWithoutExtension returns an empty string ""
-# /path/to.my/file returns an empty string as the period is in the directory name rather than the file
+{| class="wikitable"
-# file.odd_one returns an empty string as an extension (by this definition), cannot contain an underscore.
+|-
-<br><br>
+! Input
+! Output
+! Comment
+|-
+| <code>picture.jpg</code>
+| <code>.jpg</code>
+|
+|-
+| <code><nowiki>http://mywebsite.com/picture/image.png</nowiki></code>
+| <code>.png</code>
+|
+|-
+| <code>myuniquefile.longextension</code>
+| <code>.longextension</code>
+|
+|-
+| <code>IAmAFileWithoutExtension</code>
+| <code></code>
+| ''empty string''
+|-
+| <code>/path/to.my/file</code>
+| <code></code>
+| ''empty string, as the period is in the directory name rather than the file name''
+|-
+| <code>file.odd_one</code>
+| <code></code>
+| ''empty string, as an extension (by this definition), cannot contain an underscore''
+|}
+<hr>
 =={{header|ALGOL 68}}==