Skip to content
Related Articles

Related Articles

Improve Article
Save Article
Like Article

Python math function | sqrt()

  • Difficulty Level : Basic
  • Last Updated : 11 Jan, 2018


sqrt() function is an inbuilt function in Python programming language that returns the square root of any number.

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning - Basic Level Course

Syntax:
math.sqrt(x)

Parameter: 
x is any number such that x>=0 

Returns:
It returns the square root of the number 
passed in the parameter. 




# Python3 program to demonstrate the 
# sqrt() method 
  
# import the math module 
import math 
  
# print the square root of  0 
print(math.sqrt(0)) 
  
# print the square root of 4
print(math.sqrt(4)) 
  
# print the square root of 3.5
print(math.sqrt(3.5)) 

Output:

0.0
2.0
1.8708286933869707

Error: When x<0 it does not executes due to a runtime error.






# Python3 program to demonstrate the error in 
# sqrt() method 
  
# import the math module 
import math 
  
# print the error when x<0 
print(math.sqrt(-1)) 

Output:

Traceback (most recent call last):
  File "/home/67438f8df14f0e41df1b55c6c21499ef.py", line 8, in 
    print(math.sqrt(-1)) 
ValueError: math domain error

Practical Application : Given a number, check if its prime or not.
Approach: Run a loop from 2 to sqrt(n) and check if any number in range (2-sqrt(n)) divides n.




# Python program for practical application of sqrt() function
  
# import math module
import math
  
# function to check if prime or not 
def check(n):
    if n == 1:
        return False
          
        # from 1 to sqrt(n) 
    for x in range(2, (int)(math.sqrt(n))+1):
        if n % x == 0:
            return False 
    return True
  
# driver code
n = 23
if check(n):
    print("prime"
else:
    print("not prime")

Output:

prime



My Personal Notes arrow_drop_up
Recommended Articles
Page :

Start Your Coding Journey Now!