Chapter 3 Review Questions Flashcards
1.Which of the following Java operators can be used with boolean variables? (Choose all that apply.)
A. ==
B. +
C. –
D. !
E. %
F. <=
G. Cast with (boolean)
A,D
2.What data type (or types) will allow the following code snippet to compile? (Choose all that apply.)
~~~
byte apples = 5;
short oranges = 10;
_______ bananas = apples + oranges;
~~~
A. int
B. long
C. boolean
D. double
E. short
F. byte
A,B,D
3.What change, when applied independently, would allow the following code snippet to compile? (Choose all that apply.)
~~~
3: long ear = 10;
4: int hearing = 2 * ear;
~~~
A. No change; it compiles as is.
B. Cast ear on line 4 to int.
C. Change the data type of ear on line 3 to short.
D. Cast 2 * ear on line 4 to int.
E. Change the data type of hearing on line 4 to short.
F. Change the data type of hearing on line 4 to long.
B, C, D
4.What is the output of the following code snippet?
~~~
3: boolean canine = true, wolf = true;
4: int teeth = 20;
5: canine = (teeth != 10) ^ (wolf=false);
6: System.out.println(canine+”, “+teeth+”, “+wolf);
~~~
A. true, 20, true
B. true, 20, false
C. false, 10, true
D. false, 20, false
E. The code will not compile because of line 5.
F. None of the above
B
5.Which of the following operators are ranked in increasing or the same order of precedence? Assume the + operator is binary addition, not the unary form. (Choose all that apply.)
A. +, *, %, --
B. ++, (int), *
C. =, ==, !
D. (short), =, !, *
E. *, /, %, +, ==
F. !, ||, &
G. ^, +, =, +=
6.What is the output of the following program?
~~~
1: public class CandyCounter {
2: static long addCandy(double fruit, float vegetables) {
3: return (int)fruit+vegetables;
4: }
5:
6: public static void main(String[] args) {
7: System.out.print(addCandy(1.4, 2.4f) + “-“);
8: System.out.print(addCandy(1.9, (float)4) + “-“);
9: System.out.print(addCandy((long)(int)(short)2, (float)4)); } }
~~~
A. 4-6-6.0
B. 3-5-6
C. 3-6-6
D. 4-5-6
E. The code does not compile because of line 9.
F. None of the above
7.What is the output of the following code snippet?
~~~
int ph = 7, vis = 2;
boolean clear = vis > 1 & (vis < 9 || ph < 2);
boolean safe = (vis > 2) && (ph++ > 1);
boolean tasty = 7 <= –ph;
System.out.println(clear+”-“+safe+”-“+tasty);
~~~
A. true-true-true
B. true-true-false
C. true-false-true
D. true-false-false
E. false-true-true
F. false-true-false
G. false-false-true
H. false-false-false
8.What is the output of the following code snippet?
~~~
4: int pig = (short)4;
5: pig = pig++;
6: long goat = (int)2;
7: goat -= 1.0;
8: System.out.print(pig + “ - “ + goat);
~~~
A. 4 - 1
B. 4 - 2
C. 5 - 1
D. 5 - 2
E. The code does not compile due to line 7.
F. None of the above
9.What are the unique outputs of the following code snippet? (Choose all that apply.)
~~~
int a = 2, b = 4, c = 2;
System.out.println(a > 2 ? –c : b++);
System.out.println(b = (a!=c ? a : b++));
System.out.println(a > b ? b < c ? b : 2 : 1);
~~~
A. 1
B. 2
C. 3
D. 4
E. 5
F. 6
G. The code does not compile.
10.What are the unique outputs of the following code snippet? (Choose all that apply.)
~~~
short height = 1, weight = 3;
short zebra = (byte) weight * (byte) height;
double ox = 1 + height * 2 + weight;
long giraffe = 1 + 9 % height + 1;
System.out.println(zebra);
System.out.println(ox);
System.out.println(giraffe);
~~~
A. 1
B. 2
C. 3
D. 4
E. 5
F. 6
G. The code does not compile.
11.What is the output of the following code?
~~~
1: public class ArithmeticSample {
2: public static void main(String[] args) {
3: int sample1 = (2 * 4) % 3;
4: int sample2 = 3 * 2 % 3;
5: int sample3 = 5 * (1 % 2);
6: System.out.println(sample1+”-“+sample2+”-“+sample3);
7: }}
~~~
A. 0-0-5
B. 1-2-10
C. 2-1-5
D. 2-0-5
E. 3-1-10
F. 3-2-6
G. The code does not compile.
12.The ________ operator increases a value and returns the original value, while the ________ operator decreases a value and returns the new value.
A. post-increment, post-increment
B. pre-decrement, post-decrement
C. post-increment, post-decrement
D. post-increment, pre-decrement
E. pre-increment, pre-decrement
F. pre-increment, post-decrement
D
13.What is the output of the following code snippet?
~~~
boolean sunny = true, raining = false, sunday = true;
boolean goingToTheStore = sunny & raining ^ sunday;
boolean goingToTheZoo = sunday && !raining;
boolean stayingHome = !(goingToTheStore && goingToTheZoo);
System.out.println(goingToTheStore + “-“ + goingToTheZoo + “-“ +stayingHome);
~~~
A. true-false-false
B. false-true-false
C. true-true-true
D. false-true-true
E. false-false-false
F. true-true-false
G. None of the above
14.Which of the following statements are correct? (Choose all that apply.)
A. The return value of an assignment operation expression can be void.
B. The inequality operator (!=) can be used to compare objects.
C. The equality operator (==) can be used to compare a boolean value with a numeric value.
D. During runtime, the && and | operators may cause only the left side of the expression to be evaluated.
E. The return value of an assignment operation expression is the value of the newly assigned variable.
F. In Java, 0 and false may be used interchangeably.
G. The logical complement operator (!) cannot be used to flip numeric values.
15.Which operators take three operands or values? (Choose all that apply.)
A. =
B. &&
C. *=
D. ? :
E. &
F. ++
G. /
D
