Python math function | sqrt()
sqrt() function is an inbuilt function in Python programming language that returns the square root of any number.
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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 4print(math.sqrt(4)) # print the square root of 3.5print(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 moduleimport 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 coden = 23if check(n): print("prime") else: print("not prime") |
Output:
prime
