Bitstrings
You can specify a bitstring to ZWRITE as either a variable or an expression. If the ZWRITE argument is an InterSystems IRIS compressed bitstring (created using the $BIT function), ZWRITE displays the decimal representation of the compressed binary string as $ZWCHAR ($zwc) two-byte (wide) characters.
ZWRITE also displays a comment that lists the uncompressed “1” bits in left-to-right order as a comma-separated list. If there are three or more consecutive “1” bits, it lists them as a range (inclusive) with two dot syntax (n..m). For example, the bitstring [1,0,1,1,1,1,0,1] is shown as /*$bit(1,3..6,8)*/. The bitstring [1,1,1,1,1,1,1,1] is shown as /*$bit(1..8)*/. The bitstring [0,0,0,0,0,0,0,0] is shown as /*$bit()*/. The following example shows ZWRITE bitstring output:
SET $BIT(a,1) = 0
SET $BIT(a,2) = 0
SET $BIT(a,3) = 1
SET $BIT(a,4) = 0
SET $BIT(a,5) = 1
SET $BIT(a,6) = 1
SET $BIT(a,7) = 1
SET $BIT(a,8) = 0
ZWRITE a
