Python program to find the square root

Square root of Positive Numbers

Code

num = 4

sqrt_num = num ** 0.5
print(f"Square root of {num} is {sqrt_num}")

Output

Square root of 4 is 2.0

Square root of Positive numbers - through User Input

Code

num = input("Enter a number: ")

sqrt_num = float(num) ** 0.5
print(f"Square root of {num} is {sqrt_num}")

Output

Enter a number: 9
Square root of 9 is 3.0

Now be careful with this method. We are using the input() built-in function of Python. Since it returns a string, we convert the string into a number using the float() function. Then, the square root is calculated.

Using the built-in int() function will chop off the decimal places.

Square root of Complex Numbers

Code

import cmath

num = 3+5j

sqrt_num = cmath.sqrt(num)
print(f"Square root of {num} is {sqrt_num}")

Output

Square root of (3+5j) is (2.101303392521568+1.189737764140758j)

Square root of Complex Numbers - through user input

Code

import cmath

user_input = input("Enter a complex number: ")
num = eval(user_input)

sqrt_num = cmath.sqrt(num)
print(f"Square root of {num} is {sqrt_num}")

Here we are using the eval() built-in function in Python instead of float() to converting a user input string to a complex number.

Output

Enter a complex number: 2+3j
Square root of (2+3j) is (1.6741492280355401+0.8959774761298381j)

All the above codes use f-strings. Learn about python f-strings here.