Chapter 11.6, Problem 11.26CP

Program Plan Intro

Operator overloading:

• In C++ programming, operator overloading defines an operators as user defined classes and it performs the operations with one or more variables together.
• When an overloaded operator is defined as the user-defined type for executing the operations, it should be defined as a member function. So, it will help to invoke the operands.
• For manipulating data of the primitive data types, the C++ gives many operators.

Overloaded “[]” operator:

Overloaded operator contains many operator, the “[]” operator is the one of the type.

• The Overloaded “[]” operator is used to access the array value.
• It gives the ability to write a class that has an array like format.

Example:

Consider the example of overloaded “[]” operator is as follows:

// Include the header files

#include <iostream>

using namespace std;

// constant array size

const int S = 5;

// Declaration of the "Sample" class

class Sample

{

//access specifier

private:

//declare the variable

int a[S];

//access specifier

public:

//condtructor

Sample()

{

//declare the variable

int i;

//check the condition

for(i = 0; i < S; i++)

{

//set the value

a[i] = i;

}

}

//definition of overloaded "[]" operator

int &operator[](int i)

{

//check the condition

if( i >= S )

{

//display the error message

cout << "Index out of bounds" <<endl;

// return first element.

return a[0];

}

//otherwise

else

{

// return the element.

return a[i];

}

}

};

//main method

int main()

{

//create the object for the "Sample" class

Sample x;

//display the output

cout << "x[2] value is : " << x.operator[](2) <<endl;

cout << "x[5] value is : " << x.operator[](5)<<endl;

//return statement

return 0;

}