At the risk of upsetting people again...
I prefer not to call 0 "null" (which, btw, appears to be the preferred
spelling in PoPs) when what I mean is "zero". Null is a control character
which has particular functions (for example, marking the end of a
null-terminated string) and which happens to have the value X'00'. It does
not have the functions *because* it has the value zero.
Consider: If I want to clear the high-order byte of a register, I don't
say "insert a null into the high byte". I say "insert binary zeros into
the high byte". If I want to set up a null-terminated string, I say "add a
null after the last character", not "add binary zeros after the last
character".
More generally, I prefer logically appropriate data typing, for example:
DC AL1(64) A byte containing the number 64
or: DC FL1'64' A byte containing 64
DC B'01000000' A byte with bit 4 on
DC C' ' A byte containing EBCDIC space
DC X'40' A byte containing X'40' for some other
reason
Best regards, Steve Hobson
Je me presse de rire de tout, de peur d'être obligé d'en pleurer
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