LMC Addition and Subtraction

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The following program will demonstrate the ADD and SUB instructions of the LMC instruction set.

Running the program: when prompted, INPUT a set of three numbers. The program should add the first two numbers and output the answer, then subtract the first number from the third and output the answer.
INP
STA first
INP
ADD first
OUT
INP
SUB first
OUT
HLT
first DAT 0 INP
1 STA 9
2 INP
3 ADD 9
4 OUT
5 INP
6 SUB 9
7 OUT
8 HLT
9 DAT 0
Instructions

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