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[Arrays]

Assume the following two-dimensional array:

int[][] x = { {8,9}, {5,6,7}, {1,2,3,4} };

What are x[0].length, x[1].length, and x[2].length ?

ID: #24939 Competency focused Practice Questions ISC Class XII Computer Science 4 views

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A 2, 3 and 3 ✔ ✖
B 2, 3 and 4 ✔ ✖
C 3, 3 and 3 ✔ ✖
D 2, 2 and 2 ✔ ✖

Correct Answer: Option B

Explanation

[Arrays]

Assume the following two-dimensional array:

int[][] x = { {8,9}, {5,6,7}, {1,2,3,4} };

What are x[0].length, x[1].length, and x[2].length ?

(a) 2, 3 and 3

(b) 2, 3 and 4

(d) 2, 2 and 2

Correct Answer: (b) 2, 3 and 4

Explanation:

A two-dimensional array in Java is actually an array of arrays. Each row can have a different number of elements. Such arrays are called Jagged Arrays or Ragged Arrays.

Given Array:

int[][] x = { {8,9}, {5,6,7}, {1,2,3,4} };

Array Row	Elements	Length
x[0]	{8,9}	2
x[1]	{5,6,7}	3
x[2]	{1,2,3,4}	4

Step-by-Step Understanding:

x[0] contains two elements: 8 and 9 → Length = 2
x[1] contains three elements: 5, 6 and 7 → Length = 3
x[2] contains four elements: 1, 2, 3 and 4 → Length = 4

Conclusion:

Therefore:

x[0].length = 2
x[1].length = 3
x[2].length = 4

So, the correct answer is: (b) 2, 3 and 4

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Q [Arrays] Assume the following two-dimensional array: int[][] x = { {8,9}, {5,6,7}, {1,2,3,4} }; What are x[0].length, x[1].length, and x[2].length ?