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# Binary Operator Overloading in C++

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.

### Syntax of the Binary Operator Overloading

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

Here,

**return_type:** It defines the return type of the function.

**operator:** It is a keyword of the function overloading.

**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.

**Example 2: Program to add two numbers using the binary operator overloading**

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.