Python Program to Find Square Root of a Number

We are given a number and asked to find the square root of the number in python.

There are two ways through which we can find the square root of a number:

Using ** operator with 0.5 as exponential value.
Using math library.

Square Root of a Number in Python using ** Operator

Take a number as input.
Check if the number is positive. If yes then Step 3 else Step 4.
Find square root using ** i.e sqrt = num ** 0.5. Output the result.
End Program.

num = int(input("Enter a number \n"))
if num>0:
sqrt = num ** 0.5
print("Square root of {} is {}".format(num,sqrt))
else:
print("Invalid number")

num = int(input("Enter a number \n"))

if num>0:

sqrt = num ** 0.5

print("Square root of {} is {}".format(num,sqrt))

else:

print("Invalid number")

Output

Square root of a number in python

Square Root of a Number in Python using ‘math’ Library

We have to repeat almost the same steps as done in the above program. But instead of ** operator, we will use math.sqrt() method.

Note: Make sure to import math library to use math.sqrt() inbuilt method.

import math
num = int(input("Enter a number \n"))
if num>0:
sqrt = math.sqrt(num)
print("Square root of {} is {}".format(num,sqrt))
else:
print("Invalid number")

import math

num = int(input("Enter a number \n"))

if num>0:

sqrt = math.sqrt(num)

print("Square root of {} is {}".format(num,sqrt))

else:

print("Invalid number")

Output

square root in python

Any doubts then comment below.