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  


 
int FD;         \file descriptor
[Trap(false);	\prevent errors from aborting program
FD:= FOpen("input.txt", 0);
if GetErr then Text(0, "input.txt doesn't exist^m^j");
FD:= FOpen("dir", 0);
if GetErr then Text(0, "dir doesn't exist^m^j");
FD:= FOpen("/input.txt", 0);
if GetErr then Text(0, "/input.txt doesn't exist^m^j");
FD:= FOpen("/dir", 0);
if GetErr then Text(0, "/dir doesn't exist^m^j");
]