MidExam- Data Structures and Algorithms

Which of the following correctly initializes an integer array in C#?

• int[] numbers = {1, 2, 3};

• int[] numbers = new Array(3);

• int[] numbers = new int[3]{1, 2, 3, 4};

• int numbers = {1, 2, 3};

How can you access the first element of an array named data in C#?

• data[0]

• data(1)

• data.First()

• data.[1]

Given the following code, what is the output?

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

Console.WriteLine(arr.Length);

• 2

• 3

• 30

• Error

How does a multidimensional array differ from a jagged array in C#?

• Multidimensional arrays are rectangular, jagged arrays are triangular

• Jagged arrays use [,] notation while multidimensional arrays use [][]

• Jagged arrays are arrays of arrays, multidimensional arrays are a grid-like structure

• There is no difference

What is the result of the following code?

int[,] matrix = new int[2, 2] {{1, 2}, {3, 4}};

Console.WriteLine(matrix[1, 1]);

• 1

• 2

• 3

• 4

What is the correct way to iterate over all elements in a C# array?

• foreach (var item in array)

• for (item in array)

• while (array hasNext)

• repeat array

What is the syntax for declaring a multidimensional array in C#?

• int array[2, 3];

• int array[,] = new int[2, 3];

• int array[2][3];

• int[,] array = new int[2, 3];

What is the correct way to declare a 2x3 integer multidimensional array in C#?

• int array = new int[2][3];

• int[,] array = new int[2, 3];

• int[][] array = new int[2, 3];

• int array[2, 3];

Identify the error in this multidimensional array declaration:

int[,] matrix = new int[2][2];

• Invalid assignment of dimensions

• Incorrect indexing method

• Syntax error due to wrong brackets

• Multidimensional arrays cannot be declared like this

Which situation would result in a runtime error when working with a multidimensional array in C#?

• Accessing an element with a valid index

• Declaring an array without initialization

• Using a negative index in matrix[-1, 0]

• Using the wrong data type for initialization