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22C:21 Computer Science II: Data Structures Quiz 1A (15 Minutes) Some questions have more than one correct answers; please select all (Open book and notes No computers allowed) September 2, 2010
1 What is the exact output of the following code?
double area = 3.5; System.out.print("area"); System.out.print(area);
A. 3.53. B. 3.5 3. C. area3. D. area 3.
3 To assign a value 1 to variable x, you write
A. 1 = x; B. x = 1; C. x := 1; D. 1 := x; E. x == 1;
5 Which of these data types requires the most amount of memory?
A. long B. int C. short D. byte
7 Which of the following expression results in a value 1?
A. 2 % 1 B. 15 % 4 C. 25 % 5 D. 37 % 6
9 -25 % 5 is _____
A. 1 B. 2 C. 3
D. 4
E. 0
11 -24 % 5 is _____
A. - B. - C. - D. - E. 0
13 To assign a value 1 to variable x, you write
A. 1 = x; B. x = 1; C. x := 1; D. 1 := x; E. x == 1;
15 Suppose x is 1. What is x after x += 2?
A. 0 B. 1 C. 2 D. 3 E. 4
17 What is x after the following statements?
int x = 1; int y = 2; x *= y + 1;
A. x is 1. B. x is 2. C. x is 3. D. x is 4.
19 Analyze the following code.
public class Test { public static void main(String[] args) { int month = 09; System.out.println("month is " + month); } }
A. The program displays month is 09 B. The program displays month is 9 C. The program displays month is 9. D. The program has a syntax error, because 09 is an incorrect value.
21 To assign a double variable d to a float variable x, you write
A. x = (long)d B. x = (int)d; C. x = d; D. x = (float)d;
23 Which of the following assignment statements is illegal?
A. float f = -34; B. int t = 23; C. short s = 10; D. int t = (int)false; E. int t = 4.5;
25 What is the value of (double)(5/2)?
A. 2 B. 2. C. 3 D. 2. E. 3.
27 If you attempt to add an int, a byte, a long, and a double, the result will be a __________ value.
A. byte B. int C. long D. double
29 A Java character is stored in __________.
A. one byte B. two bytes C. three bytes D. four bytes
31 Which of the following statement prints smith\exam1\test.txt?
A. System.out.println("smith\exam1\test.txt"); B. System.out.println("smith\exam1\test.txt"); C. System.out.println("smith"exam1"test.txt"); D. System.out.println("smith"\exam1"\test.txt");
33 The unicode of 'a' is 97. What is the unicode for 'c'?
A. 96 B. 97 C. 98 D. 99
35 What is the printout of System.out.println('z' - 'a')?
A. 25 B. 26 C. a D. z
37 Which of the following assignment statements is correct?
A. char c = 'd'; B. char c = 100; C. char c = "d"; D. char c = "100";
39 Note that the Unicode for character A is 65. The expression "A" + 1 evaluates to ________.
A. 66 B. B C. A D. Illegal expression
