Explain indexer class.

•  An indexer allows an object to be indexed such as an array.

•  When you define an indexer for a class, this class behaves similar to a virtual array.

•  You can then access the instance of this class using the array access operator ([ ]).

element-type this[int index]

{

get { // return the value specified by index }

set { // set the value specified by index }

}

Example of Indexer class

class Student

private int roll; public int Roll

{

get (return roll; } set roll value; }

Indexer Example

}

static void Main()

{

} private int[] marks new int[3]; 

public int this[int index]

{

get (return marks[index]; } 

set (marks[index] = value; }

}

public double GetPercent()

{

double total 0.8;

foreach (int in marks)

{

}

total= total + m;

return total/marks.Length;

}

}

static void Main() 

{

Student s1 = new Student ();

s1.Roll 1;

s1[0]= 50;

s1[1]=25;

s1[2]=40;

Console. WriteLine(s1.GetPercent() ) ;

s2[0]=20;

s2[1]=30;

s2[2]=50;

Console. WriteLine(s2.GetPercent() ) ;