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Answer the following questions about basic operations in the Java programming language. 
1. The type long can be used to store values in the following range: • 231 to 231  1
• 263 to 263  1 • 264 to 264
• 232 to 232  1
Answer: 263 to 263  1The type long is a 64bit two's complement that can be used for long integers. 2. Which of the following is not a hexadecimal number? (A) 999 (B) (hex)23 (C) 0x556 (D) 0x1F2 • (A)
• (C)
• (A), (B) & (C)
• (A) & (B)
Answer: (A) & (B)Hexadecimal numbers start with "0x" in the Java programming language. 3. Select the invalid assignment statements from the following: (A) float x = 238.88; (B) double y = 0x443; • (B)
• (A) & (C) • (B) & (D)
• (A) & (B)
Answer: (A) & (C)238.88 is a double in Java. To assign this value to a float, 238.88f must be used. A variable of type boolean cannot be converted to an integer in Java.
4. If not assigned a value, a variable of type char has the following default value: • '\uffff'
• '\u0000' • " " (space)
• '\u0001'
Answer: '\u0000'The value of a variable of type char is 16 bits of data formatted as a Unicode character. 5. 15 & 29 = ? • 44
• 14
• 13 • 12
Answer: 13When written in binary format, 15 is 1111, and 29 is 11101. 1111 & 11101 is 1101, which is 13 in decimal. 6. 27  8 = ? • 8
• 19
• 35
• 27
Answer: 27When written in binary format, 27 is 11011, and 8 is 1000. 11011  1000 is 11011, which is 27. 7. Identify the statements that are correct: (A) int a = 13, a>>2 = 3 (B) int b = 8, b>>1 = 4 (C) int a = 13, a>>>2 = 3 (D) int b = 8, b>>>1 = 4 • (A), (B) & (C) • (A), (B), (C) & (D)
• (A) & (B)
• (C) & (D)
Answer: (A), (B) & (C)The shift operation "y1 >>> y2" is identical to "y1 >> y2" for all positive values of y1. It shifts the bits in y1 to the right by y2 positions. 8. Consider the following code: int x, y, z; y = 1; z = 5; x = 0  (++y) + z++; After execution of this, what will be the values of x, y and z? • x = 3, y = 2, z = 6 • x = 4, y = 1, z = 5
• x = 7, y = 1, z = 5
• x = 4, y = 2, z = 6
Answer: x = 3, y = 2, z = 6Both y and z get incremented as a result of the last statement, but y gets incremented before and z after the assisgment of the calculated value to x. 9. What will be the result of the expression a % b when a and b are of type int and their values are a = 10 and b = 6? • 1.66
• 1
• 4 • None of these
Answer: 4The modulus operator (%) may be used with floatingpoint as well as integer types. It returns the remainder of a division operation. Therefore, 10 % 6 will return 4. 10. What will be the result of the expression a % b when a and b are of type int and their values are a = 17 and b = 6? • 5
• 23
• 5 • None of these
Answer: 5a % b calculates the remainder when a is divided by b 11. What will be the value of a after execution of the following statements: int a = 23, b = 34; a = ((a < b) ? (b + a) : (b  a); • 11
• 23
• 34
• Error. Cannot be executed.
• 57
Answer: 57 12. Choose the operations that can be performed on String objects: (A) + (B) + = (C)  (D) % (E) ^ • (A)
• (D)/option>
• (A) & (B) • (D) & (E)
• None of these
Answer: (A) & (B)The "+" and "+ =" operators are overlaoded in Java. They join the two operands into one String object. 13. (1  4) + (4 & 2) = ? (in base ten) • 1
• 2
• 5 • 8
• 3
Answer: 5In binary, 1  4 is 1  100 = 101, which is 5 in decimal. Similarly, 4 & 2 is 100 & 10 = 0, which is 0 in decimal. 14. Of the following functions from the class java.lang.Math, select those that produce a value of 25, when a = 25.7. • (C)
• (D) & (E)
• (A), (C) & (E) • (A)
• (C) & (E)
Answer: (A), (C) & (E)The funtions ceil, rint and round all return the value 25 in this case. The difference lies in the type of argument returned: ceil and rint return a double, where as round will return an int or a long, depending upon the type of a (float or double, respectively). 15. In the code below, what data types the variable x can have? byte b1 = 5; byte b2 = 10; x = b1 * b2;(A) byte (B) int (C) short (D) long (E) float (F) double • (B), (D), (E) & (F) • (A), (B), (D) & (E)
• (B), (C) & (D)
• (B), (D) & (E)
• (D) & (F)
Answer: (B), (D), (E) & (F) 16. Given the declarations int x , m = 2000; short y; byte b1 = 40, b2; long n; Which of the following assignment statements will evaluate correctly? (A) x = m * b1; (B) y = m * b1; (C) n = m * 3L; (D) x = m * 3L; • (A) & (C) • (A), (B) & (C)
• (A), (C) & (D)
• (B) & (C)
• (A) & (D)
Answer: (A) & (C) 17. Given the declarations boolean b; short x1 = 100, x2 = 200, x3 = 300; Which of the following statements are evaluated to true? (A) b = x1 * 2 == x2; (B) b = x1 + x2 != 3 * x1; (C) b = (x3  2*x2<0)  ((x3 = 400)<2**x2); (D) b = (x3  2*x2>0)  ((x3 = 400) 2*x2); • (A), (B) & (C)
• (A), (C) & (D)
• (B) & (C)
• (A) & (D)
• (A) & (C)
Answer: (A) & (C) 18. In which of the following code fragments, is the variable x evaluated to 8? (A) int x = 32; x = x>>2; (B) int x = 33; x = x>>2; (C) int x = 35; x = x>>2; (D) int x = 16; x = x>>1; • (A), (B) & (C)
• (A), (C) & (D)
• (B) & (C)
• (A), (B), (C) & (D) • (A) & (D)
Answer: (A), (B), (C) & (D) 19. Consider the following code snippet: ..... ..... try • Catch block • Error. Won't compile
• Division by zero
• Division by zero Catch block
Answer: Catch block 20. Which of the following represent legal flow control statements? (A) break; (B) break(); (C) continue outer; (D) continue(inner); (E) return; (F) exit(); • (A), (B) & (C)
• (A), (C) & (D)
• (A) & (E)
• (C) & (E)
• (A), (C) & (E)
Answer: (A), (C) & (E)
Try the Quiz : Java Programming : Basic Operations : Multiple Choice
