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Homework 1
Frequently Asked
Questions
- Do we need to error check the input file? (Part A)
Yes and no. You should be checking that there were two values on
the line of the input file. You do not need to verify that the
values are in fact numeric, as the way to do that correctly
involves Regular Expressions
- All of my file test operations are failing, even though the
files are definately there. What's wrong? (Part B)
You're most likely being bit by three different features working
in conjunction: 1) a simple opendir() does not change
the current working directory of the script; 2) The
readdir() function returns only filenames, not entire
paths; 3) The file test operations look for the file given
relative to the current working directory.
See also: perldoc -f readdir (2nd paragraph)
- If the directory we're searching contains a subdirectory, do
we need to search the files in that subdirectory as well? (ie,
Does our program need to recurse directories?) (Part B)
No. This is not a requirement of the assignment. Any directories
found in the given directories should be ignored. (Note that they
should *not* be added to either the count of file names nor
first-lettered file names)
