Match terminology to definitions. 1.assertion 2. boolean 3. De Morgan\'s Laws 4.

Question

Match terminology to definitions.

1.assertion

2. boolean

3. De Morgan's Laws

4. flag

5. logical operators

6. lookahead

7. robust

8. short-circuited evaluation

Answer Choices

A. rules for negating complex boolean expressions

B. AND, OR, and NOT

C. true or false

D. when second operand of or || is not evaluated

E. can deal with illegal data and user errors

F. a boolean variable used as a control variable

G. testing values before reading them

H. a declaration that is true or false

Part 2

What is printed by the following code?

boolean flag = true;

x = 1;

while (flag) {

flag = (x < 3);

x++;

}

System.out.println(x);

A. 1

B. 2

C. 3

D. 4

E. 5

Part 3

Which boolean expression is equivalent to the following?

(! (x >= 1 && x <= 10))

A. (x < 1 && x > 10)

B. (x < 1 || x > 10

C. (x <= 1 && x >= 10)

D. (x <= 1 || x >= 10)

Part 4

Which boolean expression is equivalent to the following?

(! (x == 1 || x == 2))

A. (x != 1 && x != 2)

B. (x != 1 || x != 2)

C. (x == 1 && x == 2)

D. (x == 1 || x == 2)

Part 4

We want to be sure that the user enters an int. What should replace condition and statement in the following code?

Scanner console = new Scanner(System.in);

System.out.print("Enter an int: ");

while (condition) {

statement;

System.out.print("Try entering an int again: ");

}

int a = console.nextInt( );

1. replace condition with

2. replace statement with

Answer Choices

A. console.hasNextInt( )

B. console.nextInt( )

C. console.next( )

D. ! console.hasNextInt( )

Explanation / Answer

Part 1

A. rules for negating complex boolean expressions : De Morgan's Laws

B. AND, OR, and NOT : Logical operators

C. true or false : boolean

D. when second operand of or || is not evaluated: short-circuited evaluation

E. can deal with illegal data and user errors : robust

F. a boolean variable used as a control variable : flag

G. testing values before reading them: lookahead

H. a declaration that is true or false : ASSERTION

Part 2

What is printed by the following code?

D. 4
Explanation 4 is printed because when x becomes 3<3 , flag becomes false and x is incremented by one and then while loop exists

Part 3

Which boolean expression is equivalent to the following?

(! (x >= 1 && x <= 10))
B. (x < 1 || x > 10)

Explanation : It means ~(a and b) => ~a || ~b

Part 4

Which boolean expression is equivalent to the following?

(! (x == 1 || x == 2))

A. (x != 1 && x != 2)

Explanation : It means ~(a or b) => ~a && ~b


Part 5

1. replace condition with : A. console.hasNextInt( )

2. replace statement with B. console.nextInt( )

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