Answer:

answer re: Passing Argument 1 discards qualifiers from pointer target type

Mar 13 '13

22

It means that you're passing a const argument to a function which takes a non-const argument, which is potentially bad for obvious reasons.

huffenc probably doesn't need a non-const argument, so it should take a const char*. However, your definition of main is non-standard.

The C99 standard…

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When type matters it does