Fix a little bug in the example code

[qiuyangnie]

The variable (a, b, c) in each case should be matched the variable printed out.

[SethTisue]

@qiuyangnie I agree this is an improvement; the current code is just plain wrong

however, I wonder if it a different fix might be better: namely, to write case a all three times. the current code might give the reader the impression that it's necessary to make up a different name each time. but it isn't necessary.

wdyt?

[qiuyangnie]

I do agree with you! The earlier example in this chapter, however, should have demonstrated the 'variable name' in each case can be same. This example could provide an alternative view to demonstrate the 'variable name' in each case can be different.

[SethTisue]

I think that's a subtlety that would be lost on readers unless it was explicitly called out, and I don't think it's actually worth calling out, because using a different name each time doesn't actually make the code better; I think it's actually a bit worse that way.

So I still suggest that the right fix here is simply:

write case a all three times

[SethTisue]

(regardless: if you disagree or simply aren't interested in pursuing this further, I'll hit "merge" anyway)