Answer
\begin{array}{l}{\text { LOOP is the address of an instruction }(\mathrm{IN} \mathrm{\ X}), \text { but it is treating }} \\ {\text { this instruction as though it were a piece of data and subtracting } 1 \text { from }} \\ {\text { it. Thus, what this instruction is doing is "computing" (IN X) - } 1 \text { , which }} \\ {\text { is meaningless. However, the computer will be very happy to carry out }} \\ {\text { this meaningless operation. }}\end{array}
Work Step by Step
\begin{array}{l}{\text { LOOP is the address of an instruction }(\mathrm{IN} \mathrm{\ X}), \text { but it is treating }} \\ {\text { this instruction as though it were a piece of data and subtracting } 1 \text { from }} \\ {\text { it. Thus, what this instruction is doing is "computing" (IN X) - } 1 \text { , which }} \\ {\text { is meaningless. However, the computer will be very happy to carry out }} \\ {\text { this meaningless operation. }}\end{array}
