# Python Program to add two Complex Numbers using Class (2 Ways)

In this program, we will learn how to add two complex numbers using the Python programming language.

### What is a complex number?

Complex numbers are numbers that are expressed as a+bi where i is an imaginary number and a and b are real numbers. Some examples are −
6 + 4i
8 – 7i

## Python Programming Code to add two Complex Numbers

We will be discussing two ways to write code for it.

• Using the in-built complex Class
• Using the User-defined Complex Class

### Code:-

```print("Format for writing complex number: a+bj.\n")
c1 = complex(input("Enter First Complex Number: "))
c2 = complex(input("Enter second Complex Number: "))

print("Sum of both the Complex number is", c1 + c2)```

### Output:-

Format for writing complex number: a+bj.

Enter First Complex Number: 7+3j
Enter second Complex Number: 8+6j
Sum of both the Complex number is (15+9j)

### Using the User-defined Complex Class

To make this program, we will use classes.

We will declare a class Complex which will store the real and imaginary part of the complex number. This class will have three methods also.

The first method is initComplex(), which will help in initializing them. In this method, it will ask for the real part and imaginary part of the complex number.

The second method is display(), which will allow displaying them on the output screen.

And the third method is sum(), which will help to add two complex numbers passed in the arguments.

### Code:-

```class Complex ():
def initComplex(self):
self.realPart = int(input("Enter the Real Part: "))
self.imgPart = int(input("Enter the Imaginary Part: "))

def display(self):
print(self.realPart,"+",self.imgPart,"i", sep="")

def sum(self, c1, c2):
self.realPart = c1.realPart + c2.realPart
self.imgPart = c1.imgPart + c2.imgPart

c1 = Complex()
c2 = Complex()
c3 = Complex()

print("Enter first complex number")
c1.initComplex()
print("First Complex Number: ", end="")
c1.display()

print("Enter second complex number")
c2.initComplex()
print("Second Complex Number: ", end="")
c2.display()

print("Sum of two complex numbers is ", end="")
c3.sum(c1,c2)
c3.display()
```

### Output:-

Enter first complex number
Enter the Real Part: 8
Enter the Imaginary Part: 4
First Complex Number: 8+4i
Enter second complex number
Enter the Real Part: 9
Enter the Imaginary Part: 7
Second Complex Number: 9+7i
Sum of two complex numbers is 17+11i

#### Best Books for learning Python with Data Structure, Algorithms, Machine learning and Data Science.

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Founder and Developer at SpiderLabWeb
I love to work on new projects and also work on my ideas. My main field of interest is Web Development. 