Jagged arrays in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a jagged array of integers with 3 rows.

C Sharp (C#)

int[][] jaggedArray = new int[[1]][];

Drag options to blanks, or click blank then click option'

A2

B5

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong size for the first dimension.

Confusing jagged arrays with multidimensional arrays.

The jagged array is declared with 3 rows, so the first dimension size is 3.

2fill in blank

medium

Complete the code to initialize the second row of the jagged array with 4 elements.

C Sharp (C#)

jaggedArray[[1]] = new int[4];

Drag options to blanks, or click blank then click option'

A3

B1

C2

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 2 instead of 1 for the second row index.

Confusing the number of elements with the index.

Array indices start at 0, so the second row is at index 1.

3fill in blank

hard

Fix the error in the code to assign the value 10 to the first element of the third row.

C Sharp (C#)

jaggedArray[[1]][0] = 10;

Drag options to blanks, or click blank then click option'

A2

B0

C3

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 as an index which is out of range.

Using 1 instead of 2 for the third row.

The third row is at index 2 because indexing starts at 0.

4fill in blank

hard

Fill both blanks to create a jagged array with 2 rows, where the first row has 3 elements.

C Sharp (C#)

int[][] jaggedArray = new int[[1]][];
jaggedArray[0] = new int[[2]];

Drag options to blanks, or click blank then click option'

A2

B3

C5

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the number of rows and the size of the row.

Using incorrect sizes for the array dimensions.

The jagged array has 2 rows, so the first blank is 2. The first row has 3 elements, so the second blank is 3.

5fill in blank

hard

Fill all three blanks to initialize a jagged array with 3 rows, where the first row has 2 elements, the second row has 4 elements.

C Sharp (C#)

int[][] jaggedArray = new int[[1]][];
jaggedArray[0] = new int[[2]];
jaggedArray[1] = new int[[3]];

Drag options to blanks, or click blank then click option'

A3

B2

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the sizes of the rows.

Using wrong indices or sizes.

The jagged array has 3 rows (blank 1). The first row has 2 elements (blank 2). The second row has 4 elements (blank 3).