Repeat Exercise 21.14 adding a check in T 1 so that Y does not exceed 90.
What will be an ideal response?
T1 T2
read_item(X);
X := X-N;
read_item(X);
X := X+M;
write_item(X);
read_item(Y);
if X > 90 then exit
else write_item(X);
Y := Y+N;
if Y> 90 then
exit
else write_item(Y);
The above condition does not change the final outcome unless the initial value of X > 88 or
Y > 88. The outcome obeys the implied consistency rule that X < 90 and Y < 90.
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