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APPENDIX D
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(a) The value of the case label iFour is not a constant expression and, therefore, the code will not compile
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(d) Enum constants can be used as case labels and are not qualified with the enum type name in the case label declaration The switch expression is compatible with the case labels, as the reference this will refer to objects of the enum type Scale5, which is the type of the case labels The call to the method getGrade() returns a char value, which in this case is 'C'
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(e) The loop body is executed twice and the program will print 3 The first time the loop is executed, the variable i changes from 1 to 2 and the variable b changes from false to true Then the loop condition is evaluated Since b is true, the loop body is executed again This time the variable i changes from 2 to 3 and the variable b changes from true to false The loop condition is now evaluated again Since b is now false, the loop terminates and the current value of i is printed
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(b) and (e) Both the first and the second number printed will be 10 Both the loop body and the increment expression will be executed exactly 10 times Each execution of the loop body will be directly followed by an execution of the increment expression Afterwards, the condition j<10 is evaluated to see whether the loop body should be executed again
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(c) Only (c) contains a valid for loop The initializer in a for statement can contain either declarations or a list of expression statements, but not both as attempted in (a) The loop condition must be of type boolean (b) tries to use an assignment of an int value (notice the use of = rather than ==) as a loop condition and is, therefore, not valid The loop condition in the for loop (d) tries to use the uninitialized variable i, and the for loop in (e) is syntactically invalid, as there is only one semicolon
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(f) The code will compile without error, but will never terminate when run All the sections in the for header are optional and can be omitted (but not the semicolons) An omitted loop condition is interpreted as being true Thus, a for loop with an omitted loop condition will never terminate, unless a break statement is encountered in the loop body The program will enter an infinite loop at (4)
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APPENDIX D
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(b), (d), and (e) The loop condition in a while statement is not optional It is not possible to break out of the if statement in (c) Notice that if the if statement had been placed within a labeled block, a switch statement, or a loop, the usage of break would be valid
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(a) and (d) "i=1, j=0" and "i=2, j=1" are part of the output The variable i iterates through the values 0, 1, and 2 in the outer loop, while j toggles between the values 0 and 1 in the inner loop If the values of i and j are equal, the printing of the values is skipped and the execution continues with the next iteration of the outer loop The following can be deduced when the program is run: variables i and j are both 0 and the execution continues with the next iteration of the outer loop "i=1, j=0" is printed and the next iteration of the inner loop starts Variables i and j are both 1 and the execution continues with the next iteration of the outer loop "i=2, j=0" is printed and the next iteration of the inner loop starts "i=2, j=1" is printed, j is incremented, j < 2 fails, and the inner loop ends Variable i is incremented, i < 3 fails, and the outer loop ends
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(b) The code will fail to compile, since the conditional expression of the if statement is not of type boolean The conditional expression of an if statement must be of type boolean The variable i is of type int There is no conversion between boolean and other primitive types
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(d) Implementation (4) will correctly return the largest value The if statement does not return any value and, therefore, cannot be used as in implementations (1) and (2) Implementation (3) is invalid since neither the switch expression nor the case label values can be of type boolean
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(c) As it stands, the program will compile correctly and will print "3, 2" when run If the break statement is replaced with a continue statement, the loop will perform all four iterations and will print "4, 3" If the break statement is replaced with a return statement, the whole method will end when i equals 2, before anything is printed If the break statement is simply removed, leaving the empty statement (;), the loop will complete all four iterations and will print "4, 4"
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(a) and (c) The block construct {} is a compound statement The compound statement can contain zero or more arbitrary statements Thus, {{}} is a legal compound statement, containing one statement that is also a compound statement, containing no statement The block { continue; } by itself is not valid, since the continue statement cannot be used outside the context of a loop (c) is a valid example of breaking
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