# Python program for addition and subtraction of complex numbers

Given two complex numbers z1 and z2. The task is to add and subtract the given complex numbers.
Addition of complex number: In Python, complex numbers can be added using + operator.
Examples:

```Input:  2+3i, 4+5i
Output: Addition is : 6+8i

Input: 2+3i, 1+2i
Output: Addition is : 3+5i```

Example :

## Python3

 `# Python program to add``# two complex numbers`  `# function that returns``# a complex number after``# adding``def` `addComplex( z1, z2):``    ``return` `z1 ``+` `z2` `# Driver's code``z1 ``=` `complex``(``2``, ``3``)``z2 ``=` `complex``(``1``, ``2``)``print``( ``"Addition is : "``, addComplex(z1, z2))`

Output:

`Addition is :  (3+5j)`

Time Complexity: O(1)

Auxiliary Space: O(1)

Subtraction of complex numbers: Complex numbers in Python can be subtracted using – operator.
Examples:

```Input: 2+3i, 4+5i
Output: Subtraction is : -2-2i

Input: 2+3i, 1+2i
Output: Subtraction is : 1+1i```

Example :

## Python3

 `# Python program to subtract``# two complex numbers`  `# function that returns``# a complex number after``# subtracting``def` `subComplex( z1, z2):``    ``return` `z1``-``z2` `# driver program``z1 ``=` `complex``(``2``, ``3``)``z2 ``=` `complex``(``1``, ``2``)``print``( ``"Subtraction is : "``, subComplex(z1, z2))`

Output:

`Subtraction is :  (1+1j)`

Time Complexity: O(1)

Auxiliary Space: O(1)

#### Algorithm

1.Read the two complex numbers from the user.
2.Define a function to add two complex numbers.
3.Define a function to subtract two complex numbers.
4.Call the two functions with the two complex numbers as arguments.
5.Print the results.

## Python3

 `# Define a function to add two complex numbers``def` `complex_addition(num1, num2):``    ``return` `num1 ``+` `num2` `# Define a function to subtract two complex numbers``def` `complex_subtraction(num1, num2):``    ``return` `num1 ``-` `num2` `# Read the two complex numbers from the user``num1 ``=` `complex``(``2``, ``3``)``num2 ``=` `complex``(``1``, ``2``)` `# Call the two functions with the two complex numbers as arguments``addition ``=` `complex_addition(num1, num2)``subtraction ``=` `complex_subtraction(num1, num2)` `# Print the results``print``(``"Addition is :"``, addition)``print``(``"Subtraction is :"``, subtraction)`

Output
```Addition is : (3+5j)
Subtraction is : (1+1j)```

Time Complexity: O(1) (constant time complexity for addition and subtraction of complex numbers)
Auxiliary Space: O(1) (constant space complexity as we are using only two variables)

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