python-sqrt

Example: For positive numbers

Python Program to calculate the square root

Note: change this value for a different result

num = 8

To take the input from the user

#num = float(input('Enter a number: '))

num_sqrt = num ** 0.5 print('The square root of %0.3f is %0.3f'%(num ,num_sqrt)) Run Code Output

The square root of 8.000 is 2.828 In this program, we store the number in num and find the square root using the ** exponent operator. This program works for all positive real numbers. But for negative or complex numbers, it can be done as follows.

Source code: For real or complex numbers

Find square root of real or complex numbers

Importing the complex math module

import cmath

num = 1+2j

To take input from the user

#num = eval(input('Enter a number: '))

num_sqrt = cmath.sqrt(num) print('The square root of {0} is {1:0.3f}+{2:0.3f}j'.format(num ,num_sqrt.real,num_sqrt.imag)) Run Code Output

The square root of (1+2j) is 1.272+0.786j In this program, we use the sqrt() function in the cmath (complex math) module.

Note: If we want to take complex number as input directly, like 3+4j, we have to use the eval() function instead of float().

The eval() method can be used to convert complex numbers as input to the complex objects in Python. To learn more, visit Python eval() function.

Also, notice the way in which the output is formatted. To learn more, visit string formatting in Python.