Does

while ( attempt < 3 && !open )

do what we want?

Answer:

Yes, it means:

while ( the user has made less than 3 tries AND the lock is NOT open )

Boolean Expression

The Boolean expression

 attempt < 3 && !open

should evaluate to true when the user gets the first or another chance, and to false when the user does not get another chance. The table shows how this works:

attempts	open	attempt < 3	!open	attempt < 3 && !open	Another Chance?
0	false	true	true	true && true	true
1	false	true	true	true && true	true
1	true	true	false	true && false	false
2	false	true	true	true && true	true
2	true	true	false	true && false	false
3	false	false	true	false && true	false
3	true

The logic in a computer program is often this complicated (or worse!) A chart like this may be necessary to check that the logic is correct.

Answer:

Boolean Expression

QUESTION 11: