Python Program to Find Square Root of a Number

Summary: In this programming example, we will learn 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

1. Take a number as input.
2. Check if the number is positive. If yes then Step 3 else Step 4.
3. Find square root using ** i.e sqrt = num ** 0.5 and output the result.
4. 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")

Output:

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.

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:

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