C# sharp objective questions and answers

Which of the following true about array declaration in c#?

(I) int [][] x = new int[2][5];

(II) int [][] x = new int[2][];

(III) int [,] x = new int[2,5];

(a) Only (I) is incorrect.

(b) Only (II) is incorrect.

(c) Only (III) is incorrect.

(d) All are correct

(e) Both (II) and (III) are in correct.

Answer: (a)

Explanation: In (I) and (II) array x is jagged array. In case of jagged array declaration we can specify size of only first dimension.

In C# Rank property is used to find the dimension of an array. What would be the output of following C# code?

using System;

namespace JaggedArrayDemo

{

    class Program

    {

        static void Main(string[] args)

        {

            //Declaration and initialization of jagged array

            int[][] arr = new int[3][];

            Console.WriteLine(arr.Rank);

            Console.ReadKey();           

        }

    }

}

(a)0

(b)1

(c)2

(d)3

(e)Compilation error

Answer :( b)

Explanation: arr is not two dimensional arrays it is one dimensional jagged array.