Task

Verify that a file called     input.txt     and   a directory called     docs     exist.



This should be done twice:  

   once for the current working directory,   and
   once for a file and a directory in the filesystem root.


Optional criteria (May 2015):   verify it works with:

   zero-length files
   an unusual filename:     `Abdu'l-Bahá.txt  


 
#lang racket
 
;; here
(file-exists? "input.txt")
(file-exists? "docs")
 
;; in the root
(file-exists? "/input.txt")
(file-exists? "/docs")
 
;; or in the root with relative paths
(parameterize ([current-directory "/"])
  (and (file-exists? "input.txt")
       (file-exists? "docs")))
 