**Complex numbers java program: **In the previous article, we have discussed about Java Program to Find Product of Even and Odd Digits of a Number

In this article we are going to see how to add two complex numbers using Java programming language.

## Java Program to Add Two Complex Numbers

**Java complex class: **Complex numbers consist of two parts, one real part and another imaginary part.

`a + bi`

- Here a is the real part and b is the imaginary part, i(iota) represents root of -1
- Unfortunately, java doesn’t support complex numbers by default.
- So here we have to use a data structure to hold the two parts of the complex number.
- We will use non static class variables to store the two parts of the complex number. We can use constructors to initialize them. Each object will be a new complex number.

Let’s see different ways to add two complex numbers.

### Method 1: Java Program to Add Two Complex Numbers By Taking Static Input Value

**Approach:**

- Create a new class ComplexNumber and declare two class level variables a and b.
- Create a constructor to initialize them.
- Inside the main method of driver class, create two objects n1 and n2 representing two complex numbers.
- Call the user-defined method to do the addition.
- Define a user-defined method to find the addition.
- It takes two arguments of type ComplexNumber (whatever your class name is).
- Inside the user-defined method, create a new complex number object.
- Update its real value as the sum of real values of the arguments and update imaginary part as the sum imaginary parts of the arguments.
- Print the result inside the main method.

**Program:**

// class to store complex numbers class ComplexNum { double a; double b; // constructor to initialize complex number ComplexNum(double a, double b) { this.a = a; this.b = b; } // method to add two complex numbers public ComplexNum add(ComplexNum c2) { ComplexNum sum = new ComplexNum(this.a + c2.a, this.b + c2.b); return sum; } } public class AddComplexNums { public static void main(String[] args) { double d = sc.nextDouble(); // initialize the complex numbers ComplexNum c1 = new ComplexNum(2, 3); ComplexNum c2 = new ComplexNum(3, 4); // call the method to add the two complex numbers ComplexNum c3 = c1.add(c2); // print the result System.out.println("The sum of " + c1.a + " + " + c1.b + "i " + "and " + c2.a + " + " + c2.b + "i " + "is " + c3.a + " + " + c3.b + "i"); } }

**Output:**

The sum of 2.0 + 3.0i and 3.0 + 4.0i is 5.0 + 7.0i

### Method-2: Java Program to Add Two Complex Numbers By Using User Input Value

**Approach:**

- Inside the driver class create Scanner class object.
- Take user input for two complex numbers and initialize the numbers.
- Use the same procedure as method 1.

**Program:**

import java.util.Scanner; // driver class public class Main { public static void main(String[] args) { // create scanner class object Scanner sc = new Scanner(System.in); // prompt user to enter first complex number System.out.print("Enter the first complex number: "); double a = sc.nextDouble(); double b = sc.nextDouble(); // prompt user to enter second complex number System.out.print("Enter the second complex number: "); double c = sc.nextDouble(); double d = sc.nextDouble(); // initialize the first complex number ComplexNum c1 = new ComplexNum(a, b); // initialize the second complex number ComplexNum c2 = new ComplexNum(c, d); // call the method to add the two complex numbers ComplexNum c3 = c1.add(c2); // print the sum of the two complex numbers System.out.println("The sum of " + c1.a + " + " + c1.b + "i " + "and " + c2.a + " + " + c2.b + "i " + "is " + c3.a + " + " + c3.b + "i"); } } // class to store complex numbers class ComplexNum { double a; double b; // constructor to initialize complex number ComplexNum(double a, double b) { this.a = a; this.b = b; } // method to add two complex numbers public ComplexNum add(ComplexNum c2) { ComplexNum sum = new ComplexNum(this.a + c2.a, this.b + c2.b); return sum; } }

Output: Enter the first complex number: 2 3 Enter the second complex number: 3 4 The sum of 2.0 + 3.0i and 3.0 + 4.0i is 5.0 + 7.0i

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