Topic 2: Arrays and Data Structures

What is the primary operation performed on an array?

• Store and retrieve

• Sort and filter

• Add and remove

• Display and hide

How many dimensions can an array have?

• Only one

• Only two

• Two or three

• One, two, three, or more

In Java, how do you declare an array of 150 grades of real numbers?

• int[] grades = new int[150];

• float grades = new float[150];

• double[] grades = new double[150];

• double grades[150];

What does a sparse matrix primarily consist of?

• A mix of zeros and non-zeros

• Only non-zero elements

• Only positive numbers

• Only zero elements

What is the formula to calculate the number of elements in an array A[l:u]?

• u + l + 1

• u + l

• u - l + 1

• u - l

Which of the following is a valid way to initialize a two-dimensional array in Java?

• int[][] arr = new int[5][5];

• int arr[5][5];

• int arr = new int[5][5];

• int[5][5] arr;

What is the address calculation for a one-dimensional array A[i] in memory?

• α + i

• α - i

• α * i

• α / i

What is the representation of a non-zero element in a sparse matrix?

• (index1, index2, value)

• (x, y, element)

• (row, column, data)

• (i, j, value)

Which operation is NOT typically supported by arrays?

• Retrieval of values

• Updating values

• Storage of values

• Sorting of values

What is the maximum number of dimensions an array can have in theory?

• Only one

• Any finite number

• Three

• Two