R. Clayton (rclayton@clayton.cs.monmouth.edu)
(no date)
are "a.out -h 25" (-v not specified) and "a.out -v 25" (-h not specified)
valid command lines? Or should they result in an error?
Because they are both described as being options, it is not an error if either
or both are omitted from the command line.
Also if in the input there is a node , that has a parent and there is no
entry for the parent in the input, should the program issue an error message
or should that input be ignored?
Input having a node with a non-existent parent is malformed and should result
in an informative error message followed by an immediate exit.
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