learnpython24-(Python Program to Find the Square Root)

By

 

Python Program to Find the Square Root

In this program, you'll learn to find the square root of a number using exponent operator and cmath module.

To understand this example, you should have the knowledge of the following Python programming topics".

Python Input, Output and Import

Python Data Types

Python Operators

Example: For positive numbers

# Python Program to calculate the square root

# Note: change this value for a different result
num = 8 

# To take the input from the user
#num = float(input('Enter a number: '))

num_sqrt = num ** 0.5
print('The square root of %0.3f is %0.3f'%(num ,num_sqrt))

Output

The square root of 8.000 is 2.828

In this program, we store the number in num and find the square root using the ** exponent operator. This program works for all positive real numbers. But for negative or complex numbers, it can be done as follows.

Source code: For real or complex numbers

# Find square root of real or complex numbers
# Importing the complex math module
import cmath

num = 1+2j

# To take input from the user
#num = eval(input('Enter a number: '))

num_sqrt = cmath.sqrt(num)
print('The square root of {0} is {1:0.3f}+{2:0.3f}j'.format(num ,num_sqrt.real,num_sqrt.imag))

Output

The square root of (1+2j) is 1.272+0.786j

In this program, we use the sqrt() function in the cmath (complex math) module.

Notice that we have used the eval() function instead of float() to convert complex numbers as well. Also, notice the way in which the output is formatted.

Look here for more about string formatting in Python.



Comments

Post a Comment

Popular posts from this blog

learnpython24-(Data types and Type casting)

By
Image
  Data Types in Python Primarily there are following data types in Python. Integers (<class 'int'>): Used to store integers Floating point numbers (<class 'float'>): Used to store decimal or floating-point numbers Strings (<class 'str'>): Used to store strings Booleans (<class 'bool'>): Used to store True/False type values None: None is a literal to describe 'Nothing' in Python  Rules for defining a variable in Python: A variable name can contain alphabets, digits, and underscores (_). For E.g. : demo_xyz = ‘It’s a string variable’ A variable name can only start with an alphabet and underscore. It can't start with a digit. 5aman   is illegal and not allowed No white-space is allowed to be used inside a variable name. Also, reserved keywords are not recommended to be used as variable names. Examples of few valid variable names are  aman ,  _demo ,  de_mo , etc. Python is a fantastic language that automatically identifie...
Read more

learnpython24-(Python Program to Find the Largest Among Three Numbers)

By
  Python Program to Find the Largest Among Three Numbers In this program, you'll learn to find the largest among three numbers using if else and display it. To understand this example, you should have the knowledge of the following    Python programming topics: Python if...else Statement Python Input, Output and Import In the program below, the three numbers are stored in  num1 ,  num2  and  num3  respectively. We've used the  if...elif...else  ladder to find the largest among the three and display it. Source Code # Python program to find the largest number among the three input numbers # change the values of num1, num2 and num3 # for a different result num1 = 10 num2 = 14 num3 = 12 # uncomment following lines to take three numbers from user #num1 = float(input("Enter first number: ")) #num2 = float(input("Enter second number: ")) #num3 = float(input("Enter third number: ")) if (num1 >= num2) and (num1 >= num3): l...
Read more

learnpython24-(Python Functions)

By
Image
  Python Functions In this article, you'll learn about functions, what a function is, the syntax, components, and types of functions. Also, you'll learn to create a function in Python. What is a function in Python? In Python, a function is a group of related statements that performs a specific task. Functions help break our program into smaller and modular chunks. As our program grows larger and larger, functions make it more organized and manageable. Furthermore, it avoids repetition and makes the code reusable. Syntax of Function def function_name(parameters): """docstring""" statement(s) Above shown is a function definition that consists of the following components. Keyword  def  that marks the start of the function header. A function name to uniquely identify the function. Function naming follows the same  rules of writing identifiers in Python. Parameters (arguments) through which we pass values to a function. They are optional. A colon (:) ...
Read more