Unit 6

Consider the following code segment.

int[] arr = {1, 2, 3, 4, 5};

Which of the following code segments would correctly set the first two elements of array arr to 10 so that the new value of array arr will be {10, 10, 3, 4, 5} ?

Responses

• arr = 10, 10, 3, 4, 5;

• arr[0, 1] = 10;

• arr[0] = 10;

  arr[1] = 10;

Consider the following code segment.

int[] arr = {10, 20, 30, 40, 50};

for(int x = 1; x < arr.length - 1; x++)

{

arr[x + 1] = arr[x] + arr[x + 1];

}

Which of the following represents the contents of arr after the code segment has been executed?

Responses

• {10, 30, 60, 100, 50}

• {10, 30, 60, 100, 150}

• 
  {10, 20, 50, 90, 140}

Consider the following code segment.

int[] arr = {4, 3, 2, 1, 0};

int total = 0;

for (int k = 0; k <= total; k++)

{

if (arr[k] % 2 == 0)

{

total += arr[k];

}

else

{

total -= arr[k];

}

}

System.out.print(total);

What, if anything, is printed as a result of executing the code segment?

• 1

• 0

• Nothing is printed because the code segment causes a runtime error.

The array fruits is declared below.

String [] fruits = {"apples", "bananas", "cherries", "dates"};

Which of the following code segments will cause an ArrayIndexOutOfBoundsException ?

I.

for (int i = 0; i <= fruits.length; i++)

{

System.out.println(fruits[i]);

}

II.

for (int i = 0; i <= fruits.length - 1; i++)

{

System.out.println(fruits[i]);

}

III.

for (int i = 1; i <= fruits.length; i++)

{

System.out.println(fruits[i - 1]);

}

Responses

• I only

• I, II, and III

How to traverse an integer array in Java?

• You can traverse through an array using time − Instead on printing element by element, you can iterate the index using for loop starting from 0 to length of the array (ArrayName. length) and access elements at each index.

• You can traverse through an array using for loop or forEach loop. Using the for loop − Instead on printing element by element, you can iterate the index using for loop starting from 0 to length of the array (ArrayName. length) and access elements at each index.

Please pick the right answer.

• In Java, looping through an array or Iterating over arrays means accessing the elements of the array one by one.

• In Java, looping through an array or Iterating over arrays means accessing the elements of the array six by six

What is an enhanced for loop?

• 
  

  The enhanced foreach loop is a way of iterating through elements in arrays and collections in Java. It is more complex than the traditional for loop syntax and does not eliminate the need for manual index management, making your code more readable and less prone to errors. The syntax of the enhanced for loop is elegantly siimple.

• 
  

  The enhanced foreach loop is a way of iterating through elements in arrays and collections in Java. It simplifies the traditional for loop syntax and eliminates the need for manual index management, making your code more readable and less prone to errors. The syntax of the enhanced for loop is elegantly simple.

Please choose the correct answer.

• Array creation involves organizing data into rows and columns in a collection. In programming, arrays are stored in contiguous memory locations.

• Array creation does not involve organizing data into rows and columns in a collection. In programming, arrays are stored in contiguous memory locations.

Please choose the right answer.

• In Java, an algorithm is a step-by-step procedure or a set of instructions designed to solve a specific problem or perform a particular task. These instructions are written in Java code and can be used to manipulate data, perform calculations, or make decisions.

• In Java, an algorithm is a step-by-step procedure or a set of instructions designed to solve a specific problem or perform a particular task. These instructions are written in Python code and cannot be used to manipulate data, perform calculations, or make decisions.

Consider the following code segment.

int[] arr = {3, 1, 0, 4, 2};

for(int j = 0; j < arr.length; j++)

{

System.out.print(arr[j] + j + " ");

}

What, if anything, is printed as a result of executing the code segment?

Responses

• 3 1 0 4 2

• 3 2 2 7 6

• 6 2 0 8 4