The array index operator or subscript denoted by [] is used to retrieve and control the elements of the array and is used with the arrays it is an array operator or a binary operator whose illustration may be divided into two elements like number one expression or postfix expression and an expression amongst which number one expression or postfix expression is a pointer value like identifiers or array and the quintessential cost is the second expression wherein enumerated values also are included. The syntax of the C++ operator[] is as follows:

An example to declare a C++ operator [] is as follows:

Inside the above instance, Sagar represents the array and upon executing the above declaration, the cost that is held by way of Sagar at a function having the index 27 of Sagar array is printed. The pointer is the subscript operator which has a number one expression and it should be a quintessential value but an important point be stated is that during a c++ operator[], one of the two expressions should be a pointer price and it does no longer count number if the second one fee is a critical cost or no.

An expression such as a postfix expression observed by using [] (brackets) such as an expression specifying the position of detail within the array is called an array subscripting operator in c++. The expression inside the brackets is known as a subscript. The array’s first detail has the subscript 0. There aren't any array bounds for integrated varieties of the array. Keep in mind the example a[b] which can be interpreted as *((a) + (b)). This is also equal to b[a] because addition is associative. Among the expressions, a and b in our instance a[b], one of the expressions ought to be a pointer cost to aid the sort, and the other expression should be a necessary value or enumeration type. Lvalue is the result of an array subscript. Consider the following example demonstrating the array subscript operator in C++:

//calling the main method and it returns an integer value

//printing the array value having the index 0

//printing the array value having the index 1

//printing the array value having the index 2

Below are the examples of C++ Operator[]:

C++ program to implement and demonstrate the use of an array index operator [].

//calling the main method which returns an integer value

//defining a character array consisting of only characters and there is no limit on the number of positions on the array

//Printing the third character in the array starting from zeroth position, two different print statements are used but both the statements print the same result

C++ program to implement and demonstrate positive and negative array subscript operators.

//declaring an integer array which can consist of 1025 elements

//printing the element positioned at 513 of array check

//printing the element positioned at 256 of array check

// declaring a pointer to the center of the array

//printing the element positioned at -257 of array midcheck

//printing the element positioned at -257 of array check whose results can be     unpredictable

In this blog, we will discuss C++ Operator[]

Working of C++ Operator[] Function

Operator=() is an assignment operator overloading in c++. As we recognize that an operator overloading is used to redefine the operators to operate on the user-described statistics kind. An operator overloading in c++ is a static polymorphism or compile-time polymorphism. In c++ almost all operators can be overloaded, except some operators. So one of the operator overloadings is operator=(), which is a challenge operator overload that overloads the venture operator and redefines to operate on consumer-defined facts.

We know about the assignment operator that, it is Used to assign value to a variable represented by =(equal) sign; it is a binary operator that has R-Value and L-value the R-value assign or copies to L-Value.

So when the assignment operator is overloaded the assignment operator should be performed on the user-defined data types as well, all values of one object (user-defined data types) can be copied to another object.

return_type : : operator =(Parameter_list )

// statements to be executed to overload functionality of an assignment operator.

An operator is an operator function where the operator is a keyword that will be there for all operators overload and = is an assignment operator being overloaded.

Working and Examples of the Operator=() function in C++

Next, we write the C++ code to understand the Operator=() function working more clearly with the following example where we use Operator=() function to copy one object to another object, as below –

As inside the above code, the worker operator =(worker n ); function is described for a project operator overload, as right here this feature established the employee magnificence item as a parameter and it returns conventional item profits that's what assigned or copied to some other object while used mission operator as in code worker e3 = e1; as soon as compiler stumbles upon e3 = e1; statement it calls to the operator =(employee n ); defined characteristic as e3.Operator =(e1). Right here e1 object is handed as a parameter and e3 is the object on which the undertaking operator characteristic is referred to as, so e1. Revenue is assigned or copied to the e3 object.

Next, we rewrite the above C++ code to see what happen if we do not define the Operator =() function in class to copy one object to another object, as below –

As inside the above code, the employee operator =(worker n); characteristic is not described for a mission operator to be overload, but object e1 is copied to e3 as we got the equal output 20000. So the project operator is via default overloaded for person-defined gadgets, while another binary operator via default isn't overloaded like ‘+’, ‘-‘, ‘*’ etc.

Next, we rewrite the above c++ code to see what happen if we do not define the Operator +() function in class to perform the addition of object, as below –

In this blog, we will discuss C++ operator=()

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