This section will discuss the Binary Operator Overloading in the C++ programming language. An operator which contains two operands to perform a mathematical operation is called the Binary Operator Overloading. It is a polymorphic compile technique where a single operator can perform various functionalities by taking two operands from the programmer or user. There are multiple binary operators like +, -, *, /, etc., that can directly manipulate or overload the object of a class. For example, suppose we have two numbers, 5 and 6; and overload the binary (+) operator. So, the binary (+) operator adds the numbers 5 and 6 and returns 11. Furthermore, we can also perform subtraction, multiplication, and division operation to use the binary operator for various calculations.

Following is the Binary Operator Overloading syntax in the C++ Programming language.

Here,

return_type: It defines the return type of the function.

binary_operator_symbol: It represents the binary operator symbol that overloads a function to perform the calculation.

arg: It defines the argument passed to the function.

### Steps to Overload the Binary Operator to Get the Sum of Two Complex Numbers

Step 1: Start the program.

Step 2: Declare the class.

Step 3: Declare the variables and their member function.

Step 4: Take two numbers using the user-defined inp()function.

Step 6: Similarly, define the binary (-) operator to subtract two numbers.

Step 7: Call the print() function to display the entered numbers.

Step 8: Declare the class objects x1, y1, sum, and sub.

Step 9: Now call the print() function using the x1 and y1 objects.

Step 10: After that, get the object sum and sub result by adding and subtracting the objects using the ‘+’ and ‘-‘ operators.

Step 11: Finally, call the print() and print2() function using the x1, y1, sum, and sub.

Step 12: Display the addition and subtraction of the complex numbers.

Step 13: Stop or terminate the program.

Example 1: Program to perform the addition and subtraction of two complex numbers using the binary (+) and (-) operator

Let’s create a program to calculate the addition and subtraction of two complex numbers by overloading the ‘+’ and ‘-‘ binary operators in the C++ programming language.

Output

`Input two complex numbers:  5  7  Input two complex numbers:  3  5  Entered values are:  5 + 7i  3 + 5i  The addition of two complex (real and imaginary) numbers: 8 + 12i  The subtraction of two complex (real and imaginary) numbers: 2 - 2i     `

In the above program, we take two numbers from the user, and then use the binary operator to overload the ‘+’ and ‘-‘ operators to add and subtract two complex numbers in a class.

Let’s create a program to calculate the sum of two numbers in a class by overloading the binary plus(+) operator in the C++ programming language.

Output

`Enter the first number: 5  Enter the second number: 6  The sum of two numbers is: 11     `

In the above program, we take two numbers, 5 and 6, from the user and then overload the binary plus (+) operator to perform the addition that returns the sum of two numbers is 11.

Example 3: Program to perform the arithmetic operation by overloading the multiple binary operators

Let’s create a program to overload multiple binary operators in a class to perform the arithmetic operations.

Output

`Addition : 40  Subtraction : 0  Multiplication : 400  Division : 1      `

In the above program, we declare the value of variable num is 20 and then overload the binary plus (+), minus (-), multiply (*), and division (/) operator to perform the various arithmetic operations in the Arith_num class.