Java 2

1. Which of the following is the newline character?

\r

\n

\l

\b

REF: 80

Explanation

REF: 80

2. Suppose that x and y are int variables and x = 10 and y = 20. After the statement: x = x + y; executes, the value of x is ____.

10

20

30

None of these

REF: 54

Explanation

REF: 54

3. Which of the following is the correct syntax for commenting in Java?

# Enter Comments Here

""

/* Enter Comments Here*/

** Enter Comments Here **

REF: 91

Explanation

REF: 91

4. Which of the following is NOT a reserved word in Java?

Int

Public

Static

Num

REF: 34

Explanation

REF: 34

5. Which of the following is a valid int value?

46,259

46259

462.59

None of these

REF: 37

Explanation

REF: 37

6. The ____ rules of a programming language tell you which statements are legal, or accepted by the programming language.

Semantic

Logical

Syntax

Grammatical

REF: 33

Explanation

REF: 33

7. Suppose that x, y and z are int variables. The expression x(y+z) in Java is written as ____.

X * y + z

X * (y + z)

Y + x * z

None of these

REF: 40

Explanation

REF: 40

8. Suppose that x, y, z, and w are int variables. The expression x(y-z)/w in Java is written as ____.

X * y - z / w

X * y - x * z / w

X * (y - z) / w

X (y - z) / w

REF: 40

Explanation

REF: 40

9. The declaration int a, b, c; is equivalent to which of the following?

Int a b, c;

Int a, b, c;

Int abc;

Int a b c;

REF: 91 | 92

Explanation

REF: 91 | 92

10. What is the output of the following statement? System.out.println("Welcome \n Home");

WelcomeHome

Welcome Home

Welcome (on first line) Home (on second line)

Welcome \n Home

REF: 76

Explanation

REF: 76

11. The expression (double)(6 + 2) evaluates to ____.

7

8

8.0

10

REF: 49 | 50

Explanation

REF: 49 | 50

12. The expression (int)6.9 + (int)7.9 evaluates to ____.

13

14

14.8

15

REF: 49 | 50

Explanation

REF: 49 | 50

13. Suppose that x = 5 and y = 6. What is the output of the following Java statement? System.out.println("Sum of " + x + " and " + y + " = " + (x + y));

Sum of 5 and 6 = 11

Sum of x and y = 11

Sum of x and y = x + y

None of these

REF: 72 | 75

Explanation

REF: 72 | 75

14. Suppose that x is an int variable. What is the value of x after the following statement executes: x = 15 + (int)(10.5) / 2;.

20

20.25

21

22

REF: 49 | 50

Explanation

REF: 49 | 50

15. The length of the string "computer science" is:

14

15

16

18

REF: 51

Explanation

REF: 51

16. The expression (int)9.9 evaluates to ____.

9

9.0

9.9

10

REF: 49 | 50

Explanation

REF: 49 | 50

17. The value of the expression 26 + 14 / 3 + 1 is ____.

10

14

29

31

REF: 45

Explanation

REF: 45

18. The value of the expression 17 % 7 is ____.

1

2

3

None of these

REF: 40

Explanation

REF: 40

19. Which of the following is a legal identifier?

Program!

Program_1

1program

Program 1

REF: 34

Explanation

REF: 34

20. Suppose that alpha and beta are int variables. The statement alpha = beta++; is equivalent to the statement(s) ____.

Alpha = 1 + beta;

Alpha = alpha + beta;

Alpha = beta; beta = beta + 1;

None of these

REF: 70 | 71

Explanation

REF: 70 | 71

21. Which of the following is NOT a special symbol in Java?

+

#

!=

?

REF: 33

Explanation

REF: 33

22. The value of the expression 26 – 14 % 3 + 1 is ____.

0

1

24

25

REF: 41

Explanation

REF: 41

23. The value of the expression 1 + 5 % 3 is ____.

0

2

3

4

REF: 45

Explanation

REF: 45

24. Suppose that alpha is a double variable. What is the value of alpha after the following statement executes: alpha = 11.5 + (double)(15) / 2;

18.0

18.5

19.0

None of these

REF: 49 | 50

Explanation

REF: 49 | 50

25. Suppose x = 2 and y = 3. If the statement x *= y; is executed once, what is the value of x?

2

3

5

6

REF: 93

Explanation

REF: 93

26. Operators that have two operands are called ____.

Unary operands

Binary operands

Operators

Expressions

REF: 45

Explanation

REF: 45

27. Which of the following is a valid Java identifier?

1Stop_and_go

#salaryForTheMonth

_Hello_There

MyNumber!

REF: 34

Explanation

REF: 34

28. Suppose that x = 5 and y = 6. What is the output of the following Java statement? System.out.println("Sum of " + x + " and " + y + " = " + x + y);

Sum of 5 and 6 = 11

Sum of 5 and 6 = 56

Sum of x and y = 11

None of these

REF: 72 | 75

Explanation

REF: 72 | 75

29. The value of the expression 44 / 10 is _____.

0.4

4

4.0

4.4

REF: 40

Explanation

REF: 40

30. The value of 3 % 9 is ___.

0

1/3

3

9

REF: 40

Explanation

REF: 40

31. Consider the following sequence of statements. String str; int num1, num2; num1 = 13; num2 = 24; str = "The sum = " + num1 + num2; What is the final value stored in str?

The sum = 37

The sum = 13 24

The sum = 13 + 24

The sum = 1324

REF: 72

Explanation

REF: 72

32. ____ are executable statements that inform the user what to do.

Variables

Prompt lines

Named constants

Expressions

REF: 90

Explanation

REF: 90

33. Which of the following statements about a named constant is NOT true?

Its content cannot change during program execution.

Its value can be changed during program execution.

It is a memory location.

It is declared using the reserved word final.

REF: 52

Explanation

REF: 52

34. What is the floating-point notation for 25.611?

2.5E1

2.6

2.561100E1

256.1100E1

REF: 39

Explanation

REF: 39

35. Suppose x = 2 and y = 3. If the statement x *= y; is executed once, what is the value of y?

2

3

5

6

REF: 93

Explanation

REF: 93

36. Suppose that alpha and beta are int variables. The statement alpha = ++beta; is equivalent to the statement(s) ____.

Beta = beta + 1; alpha = beta;

Alpha = 1 + beta;

Alpha = alpha + beta;

None of these

REF: 70 | 71

Explanation

REF: 70 | 71

37. What type of Java statement(s) stores a value in a variable?

Input

Output

Assignment

Both an input statement and an assignment statement

REF: 54

Explanation

REF: 54

38. Consider the following program. // Insertion Point 1 public class CircleArea { // Insertion Point 2 static final float PI = 3.14 public static void main(String[]args) { //Insertion Point 3 float r = 2.0; float area; area = PI * r * r; System.out.println("Area = " + area); } // Insertion Point 4 } In the above code, where do the import statements belong?

Insertion Point 1

Insertion Point 2

Insertion Point 3

Insertion Point 4

REF: 82 | 83

Explanation

REF: 82 | 83

39. Which of the following is a reserved word in Java?

Char

CHAR

None of these

REF: 34

Explanation

REF: 34

40. The value of the expression 36 – 15 % 2.0 + 1 is ____.

36

36.0

37

This is an illegal Java expression

REF: 46 | 47

Explanation

REF: 46 | 47

41. Given int one; double two; boolean four; Which of the following assignment statements are valid? (i) one = 7 + 3 % 4; (ii) 2.3 + 3.5 = two; (iii) four = (2 <= 3);

Only (i) is valid

(i) and (ii) are valid

(ii) and (iii) are valid

(i) and (iii) are valid

REF: 54

Explanation

REF: 54

42. All of the following are examples of integral data types EXCEPT ____.

Int

Char

Double

Byte