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Unicode - Data Structures - Quiz, Exercises of Data Structures and Algorithms

Main points of this past exam are: Unicode, Illegal Expression, Stored in Variable, Declare a Variable, Correct Expression, Statements Display, Method with Value

Typology: Exercises

2012/2013

Uploaded on 04/07/2013

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22C:21 Computer Science II: Data Structures
Quiz 1B (15 Minutes)
Some questions have more than one correct answers; please select all
(Open book and notes; no computers)
September 2, 2010
2 Which of the following are correct ways to declare
variables?
A. int length; int width;
B. int length, width;
C. int length; width;
D. int length, int width;
4 To declare a variable MAX_LENGTH inside a
method with value 99.98, you write
A. int MAX_LENGTH = 99.98;
B. float MAX_LENGTH = 99.98;
C. double MAX_LENGTH = 99.98;
D. long MAX_LENGTH = 99.98;
6 What is the result of 45 / 4?
A. 10
B. 11
C. 11.25
D. 12
8 25 % 1 is _____
A. 1
B. 2
C. 3
D. 4
E. 0
10 24 % 5 is _____
A. 1
B. 2
C. 3
D. 4
E. 0
12 To add a value 1 to variable x, you write
A. 1 + x = x;
B. x += 1;
C. x := 1;
D. x = x + 1;
E. x = 1 + x;
14 To add number to sum, you write
A. number += sum;
B. number = sum + number;
C. sum = Number + sum;
D. sum += number;
E. sum = sum + number;
16 Suppose x is 1. What is x after x -= 1?
A. 0
B. 1
C. 2
D. -1
E. -2
18 What is x after the following statements?
int x = 1;
x *= x + 1;
A. x is 1.
B. x is 2.
C. x is 3.
D. x is 4.
.
20 Are the following four statements equivalent?
number += 1;
number = number + 1;
number++;
++number;
A. Yes
B. No
pf2

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22C:21 Computer Science II: Data Structures Quiz 1B (15 Minutes) Some questions have more than one correct answers; please select all (Open book and notes; no computers) September 2, 2010

2 Which of the following are correct ways to declare variables?

A. int length; int width; B. int length, width; C. int length; width; D. int length, int width;

4 To declare a variable MAX_LENGTH inside a method with value 99.98, you write

A. int MAX_LENGTH = 99.98; B. float MAX_LENGTH = 99.98; C. double MAX_LENGTH = 99.98; D. long MAX_LENGTH = 99.98;

6 What is the result of 45 / 4?

A. 10 B. 11 C. 11. D. 12

8 25 % 1 is _____

A. 1 B. 2 C. 3 D. 4 E. 0

10 24 % 5 is _____

A. 1 B. 2 C. 3 D. 4 E. 0 12 To add a value 1 to variable x, you write A. 1 + x = x;

B. x += 1; C. x := 1; D. x = x + 1; E. x = 1 + x;

14 To add number to sum, you write

A. number += sum; B. number = sum + number; C. sum = Number + sum; D. sum += number; E. sum = sum + number;

16 Suppose x is 1. What is x after x -= 1?

A. 0 B. 1 C. 2 D. - E. -

18 What is x after the following statements?

int x = 1; x *= x + 1;

A. x is 1. B. x is 2. C. x is 3. D. x is 4. . 20 Are the following four statements equivalent? number += 1; number = number + 1; number++; ++number;

A. Yes B. No

22 What is the printout of the following code:

double x = 5.5; int y = (int)x; System.out.println("x is " + x + " and y is " + y);

A. x is 5 and y is 6 B. x is 6.0 and y is 6. C. x is 6 and y is 6 D. x is 5.5 and y is 5 E. x is 5.5 and y is 5.

24 What is the value of (double)5/2?

A. 2 B. 2. C. 3 D. 2. E. 3.

26 The expression (int)(76.0252175 * 100) / 100 evaluates to _________.

A. 76. B. 76 C. 76. D. 76.

28 Which of the following is the correct expression of character 4?

A. 4 B. "4" C. '\0004' D. '4'

30 Suppose x is a char variable with a value 'b'. What is the printout of the statement System.out.println(++x)?

A. a B. b C. c D. d

32 Suppose i is an int type variable. Which of the following statements display the character whose Unicode is stored in variable i?

A. System.out.println(i); B. System.out.println((char)i); C. System.out.println((int)i); D. System.out.println(i + " ");

34 Will System.out.println((char)4) display 4?

A. Yes B. No

36 An int variable can hold __________.

A. 'x' B. 120 C. 120. D. "x" E. "120"

38 The expression "Java " + 1 + 2 + 3 evaluates to ________.

A. Java B. Java C. Java 123 D. java 123 E. Illegal expression

40 Note that the Unicode for character A is 65. The expression 'A' + 1 evaluates to ________.

A. 66 B. B C. A D. Illegal expression