#4 Checking errors and printing them

[Anonymous]

First of all, thanks for a nice utility!

Please add more error handling to the enter command (and perhaps to other commands too). For example, the following command line does nothing:

hexed.exe -e 100 22 ahexed_test

(Yes, I know I should use '-' right before the file name in this case but I can forget it).

And this writes just one byte with value 1:

hexed.exe -e 100 9ABCDEF01 - hexed_test.txt

That's very confusing.