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