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

by Amit Rawat · Published June 14, 2019 · Updated June 14, 2019

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

Using the in-built 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