Problem Statement

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

This should be done twice:

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

Let's start with the solution:

"foo.bar" "w" fopen
"Hallo !" over fputs
fclose

"fou.bar" "r" fopen
dup 0 < if "Could not open 'foo.bar' for reading" print drop else fclose endif