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Predict the logic of the given LMC program.LOOP LDA COUNTBRZ ENDADD ONESTA COUNTLDA AADD ONEOUTSTA ABRA LOOPEND HLTCOUNT DAT -5A DAT 0ONE DAT 1

Question

Predict the logic of the given LMC program.

LOOP LDA COUNT
BRZ END
ADD ONES
STA COUNT
LDA A
ADD ONE
OUT
STA ABRA
LOOPEND HLT
COUNT DAT -5
A DAT 0
ONE DAT 1
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Solution

To predict the logic of the given program, we need to analyze each step and understand the instructions being executed.

  1. The program starts at the label "LOOP".
  2. The instruction "LDA COUNT" loads the value at the memory address labeled "COUNT" into the accumulator.
  3. The instruction "BRZ END" checks if the value in the accumulator is zero. If it is, the program branches to the label "END" and terminates.
  4. If the value in the accumulator is not zero, the program continues to the next instruction.
  5. The instruction "ADD ONE" adds the value at the memory address labeled "ONE" to the value in the accumulator.
  6. The instruction "STA COUNT" stores the value in the accumulator back to the memory address labeled "COUNT".
  7. The instruction "LDA A" loads the value at the memory address labeled "A" into the accumulator.
  8. The instruction "ADD ONE" adds the value at the memory address labeled "ONE" to the value in the accumulator.
  9. The instruction "OUT" outputs the value in the accumulator.
  10. The instruction "STA A" stores the value in the accumulator back to the memory address labeled "A".
  11. The instruction "BRA LOOP" branches back to the label "LOOP" and repeats the process.

In summary, this program loops through a sequence of instructions until the value at the memory address labeled "COUNT" becomes zero. It adds the value at the memory address labeled "ONE" to the accumulator, stores it back to "COUNT", outputs the value, and then repeats the process.

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