How create an Little Mans Computer (LMC) code that will get a number. Display 1 if the number is odd, display 0 if the number is even

Question

I need help in my study\'s where it can display 1 if the number is even and 0 if the number is odd. for example if the input is 99 it will display the output 1 which means odd.

Answer 1

Margaret's answer expects the accumulator to have a determined value when the negative flag is set by a previous subtraction of 2. Or at least that adding 2 to that would bring the accumulator back in its previous state.

This may be true in some implementations, but there is no guarantee. In theory the LMC only deals with non-negative numbers, and the only notion of negative is in the "negative" flag. Wikipedia warns that the accumulator's value is undefined after a subtraction leads to overflow on the negative end.

There is for instance this implementation of an LMC where the accumulator will be set to -1 whatever the magnitude of the overflow is, and so the distinction between odd and even is lost at that moment. Many will consider this a very odd implementation, but it is compliant with the LMC specification.

Here is a version that does not make assumptions beyond the LMC specification:

#input: 9
       INP
  loop STA result
       SUB two
       BRP loop
       LDA result ; restore value from before subtraction
       OUT
       HLT
   two DAT 2
result DAT