hardcoded constants

[Doug Gwyn]

In article <15145 at mimsy.UUCP> chris at mimsy.UUCP (Chris Torek) writes:
>sizeof is indeed not a function, yet sizeof('\0') is the same as
>sizeof(0) and sizeof(int), which are usually not the same as sizeof(char).

We should probably explain also that it's the same as sizeof 0 and
sizeof '\0', but not sizeof int (which is illegal).  Since any C
text should explain this, look it up if you don't understand.