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Exam 4: Decision Structures

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Question 21

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Select all that apply. Which method of the Random class will return a random number within the range of 0.0 and 1.0?

A) nextDouble()
B) nextLong()
C) nextFloat()
D) nextInt(int n)

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Question 22

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Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 12.8?

A) "###.#"
B) "###.0"
C) "000.0"
D) "#0.00%"

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Question 23

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A flag may have the values

A __________ is a boolean variable that signals when some condition exists in the program.

Which of the following expressions will determine whether x is less than or equal to y?

What will be the value of ans after the following statements are executed? int x = 40; Int y = 40; If (x = y) Ans = x + 10;

A random number, created as an object of the Random class, is always an integer.

What will be the value of discountRate after the following statements are executed? double discountRate; Char custType = 'B'; Switch (custType) { Case 'A': DiscountRate = 0.08; Break; Case 'B': DiscountRate = 0.06; Case 'C': DiscountRate = 0.04; Default: DiscountRate = 0.0; }

Which of the following expressions will generate a random number in the range of 1 through 10?

Java requires that the boolean expression being tested by an if statement be enclosed in

Which of the following statements will create an object from the Random class?

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.

When testing for character values, the switch statement does not test for the case of the character.

Which of the following expressions determines whether the char variable, chrA, is not equal to the letter 'A'?

The __________ statement is used to create a decision structure which allows a program to have more than one path of execution.

All it takes for an AND expression to be true is for one of the subexpressions to be true.

Which of the following statements determines whether the variable temp is within the range of 0 through 100 (inclusive) ?

If the expression on the left side of the && operator is false, the expression on the right side will not be checked.

The DecimalFormat class is part of the Java API so it is automatically available to your programs.

What will be displayed after the following statements are executed? int hours = 30; Double pay, payRate = 10.00; Pay = hours <= 40 ? hours*payRate : hours*payRate*2.0; System.out.println(pay) ;