The BBC and Master Computer Public Domain Library

9D89 'AND' operator

Submitted by Steve Fewell

Description:

[96BE] Convert the first value (current value) to an integer (if it's a Float).
If the first value is a string then issue a ype Mismatch error.
Push the first value to the stack.
[9DA9] Get the next value (expression handler level 3 [<, =, >). For the next value
we only need to search the operators with higher precedence, as these must be evaluated
before we have the correct second value that we need. If the value obtained is a float
then convert it to an integer (if it's a string then Type Mismatch error).

AND the Integer on the stack (first value) with the Integer in the IWA (second value)
storing the result in the IWA.
We now have the result we require.

Reclaim the stack space, set A = #&40 (as we are handling an Integer) and jump to
&9D84 to check for further AND operators which need to be processed. Note: We
only need to check for the AND operator, as all higher precedence operators have
already been processed.

Disassembly for the 'AND' Operator routine