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How do you know that it's the "E" that is wrong, and not the ASCII_A? Maybe it should be ASCII_E.Ultimately you don't, but ASCII_A requires double the intentional actions to name it and have it also be 'A', whereas 'A' vs 'E' or whatever else is a much easier typo.
It's the whole idea behind NOT having magic values in your code. That is, that:
if (temp > 212)
tells us much less than:
if (temp > WATER_BOILING_TEMP)
and that we can more easily spot an error with:
WATER_BOILING_TEMP = 275
than with:
if (temp > 275)
