1. What is a common use for a flag variable?

A. To accumulate a sum

B. To "remember" that something has occurred

C. To count

D. To signal the end of input

2. Which expression correctly tests if the variable ch holds an upper case letter?

A. ch >= 'A' || ch <= 'Z'

B. ch <= 'A' && ch >= 'Z'

C. ch >= 'A' && ch <= 'Z'

D. None of the above

3. Which of the following use short circuit evaluation? Select all that match.

A. false &&

B. true &&

C. false ||

D. true ||