[coldtea]

>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)

[icebraining]

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.

Unless, as I wrote after, you have both ASCII_A and ASCII_E declared, which wouldn't be surprising.

I don't find the "spot the error" argument to be very convincing; I still name stuff, but just for the semantic value.

[dragonwriter]

275°F is about right at a little over 3 bar.

Or 275°C at around 60 bar.