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Exam 3: Decision Structures

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Question 31

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If you prematurely terminate an if statement with a semicolon, the compiler will:

A) Not display an error message
B) Assume you are placing a null statement there
C) All of the above
D) None of the above

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Question 32

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This is a boolean variable that signals when some condition exists in the program:

A) Sentinel
B) Block
C) Flag
D) Case

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Question 33

True/False

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Programs never need more than one path of execution.

In a switch statement, if two different values for the CaseExpression would result in the same code being executed, you must have two copies of the code, one after each CaseExpression.

What does the following code display? Int d = 9, e = 12; System.out.printf("%d %d\n", d, e) ;

________ works like this: If the expression on the left side of the && operator is False, the expression the right side will not be checked.

The expression tested by an if statement must evaluate to:

Unicode is an international encoding system that is extensive enough to represent ALL the characters of ALL the world's alphabets.

The switch statement is a:

What will be the value of charges after the following code is executed? Double charges, rate = 7.00; Int time = 180; Charges = time <= 119 ? Rate * 2 : Time / 60.0 * rate;

A flag may have the values:

When two Strings are compared using the compareTo method, the cases of the two strings are not considered.

The String.format method works exactly like the System.out.printf method, except that it does not display the formatted string on the screen.

What would be the value of discountRate after the following statements are executed? Double discountRate = 0.0; Int purchase = 100; If (purchase > 1000) DiscountRate = .05; Else if (purchase > 750) DiscountRate = .03; Else if (purchase > 500) DiscountRate = .01;

Which of the following will format 12.7801 to display as $12.78?

Because the || operator performs short-circuit evaluation, your boolean expression will generally be evaluated faster if the subexpression that is most likely to be true is on the left.

The ________ statement is used to make simple decisions in Java.

What will be printed when the following code is executed? Int y = 10; If ( y == 10) { Int x = 30; X += y; } System.out.print("x = ") ; System.out.print(x) ;

What is the value of x after the following code has been executed? Int x = 75; Int y = 90; If ( x != y) X += y;

This is an international coding system that is extensive enough to represent all the characters of all the world's alphabets: