AP CSA - Unit 6 - Arrays
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English
9th - 12th Grade
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17 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Arrays are immutable. Immutable means:
dynamic
Answer explanation
In computer science, "immutable" means something that can't be changed after it's made. Once created, its value or state stays the same always. For example, in Java, a String is immutable. If you make a String with certain text, you can't change that text later. You need to make a new String for a different text.
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Which of the following is the correct way to initialize an array in Java?
I. int[] num = new int[3];
II. int[] num = new array [1,2,3];
III. int[] num = {1,2,3};
I only
II only
III only
I and II
I and III
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Which of the following is the correct way to initialize an array in Java?
I. String [] str = new String[3];
II. String str [ ] = {"hi","hello"};
III. String [] str = {'1','2','3'};
I only
II only
III only
I and II
I and III
Answer explanation
Though the syntax looks a little strange, the code in line II still works correctly.
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Consider the following code segment:
int[] num = new int[5];
System.out.println(num[3]);
What is the output of the above code?
3
ArrayIndexOutOfBounds
Compile-time Error
Answer explanation
When an array is created, but is not assigned any values, it is automatically filled with zeroes.
Therefore,
int[] num = new int[5];
Will look like this:
{0, 0, 0, 0, 0}
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Consider the following code segment:
double[] num = new double[5];
System.out.println(num[3]);
What is the output of the above code?
3.0
null
ArrayIndexOutOfBounds
0.0
Compile-time Error
Answer explanation
When an array is created, but is not assigned any values, it is automatically filled with zeroes.
Therefore,
int[] num = new int[5];
Will look like this:
{0, 0, 0, 0, 0}
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Consider the following code segment:
String[] str= new String[5];
System.out.println(str[3]);
What is the output of the above code?
3
ArrayIndexOutOfBounds
Compile-time Error
Answer explanation
When an int array is declared but not initialized it is automatically filled with zeroes. However, when a string array is declared but not initialized, it is automatically filled with null values.
Therefore,
String[] str= new str[5];
Will look like this:
{null, null, null, null, null}
7.
FILL IN THE BLANKS QUESTION
3 mins • 1 pt
int number = 13;
int[] values = {0, 1, 2, 3, 4, 5};
for (int i = 0; i < values.length; i++)
{
number += values[i];
}
System.out.println(number);
What number is printed as a result of executing the code above?
(a)
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