reverse number in python using while loop

If you want to reverse the string -- build it up and then return the reversed string. Most functions shouldn't have print in them. Then, find the reverse of the number using for loop. Multiply the temporary variable by 10. Is it appropriate to ignore emails from a student asking obvious questions? Like the While loop, Python for loop is also used to reverse the number. I don't understand one part of it: why have you included the 'result' accumulator? In Python, the recursive function can call itself during the program code. Required fields are marked *. We loop over the result, setting c to each character in the hex version of the number. Thanks for contributing an answer to Stack Overflow! Then, find the reverse of a number using the while loop and check if the number is equal to the reverse number or not using the if-else statement. Program Description:- Write a Python program to check if the number is a palindrome or . Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? But if the number was zero to begin with, the .lstrip() takes off the entire digit, resulting in an empty string, "". We can also take the help of a built-in function to reverse a number in python using for loop. Let's have a look at the program first: Produces same output as of previous program. Any mathematical operation like addition and multiplication is easily performed using an integer value. Is Energy "equal" to the curvature of Space-Time? Using Reversed Method. Procedure to find reverse of a number, Take a number. Let us consider a case where the given number contains trailing zeroes . Next, determine if the value entered is an integer or not. Slicing is used to get the substring from any string. Multiply reverse_number by 10 and add the remainder to reverse_number like below. Compare the original number with reverse number. I n this tutorial, we are going to see how to reverse a number in C using While loop. Here are the list of approaches used: To find reverse of a given number in Python, you have to ask from user to enter a number, then reverse and print I am still a beginner so I would prefer short, simple codes that I can understand. Loop while number > 0 Loop while number > 0. How to remove an element from a list by index. reverse_number = (reverse_number * 10) + remainder. The reversed number is printed with the help of a print statement. Convert this reversed string to integer to avoid leading zeros as mentioned in method #2. Not the answer you're looking for? Declare a temporary variable and initialize it with 0. Step 2: take an input from the user (let's say size). Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? Reverse a List by the while Loop in Python Declare a list of 10 random integers that we want to create a new list in reverse order. . The dry run of above program with 236 as user input, goes like:. Here is the code I have come up with: This code works fine, except for one problem: For example, if my parameter value is 45, the output becomes 132. Then, find the reverse of a number using the while loop and finally, the result will be displayed on the screen. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Step 3: Create two empty lists. Finally, the result will be displayed on the screen. The for loop reverses the number by adding the last digit into a new empty string and continuing until the index value reaches the first digit. Create a function for reversing a number that accepts the input num as its parameter. Since each base-4 digit represents 2 bits, and each base-16 digit represents 4 bits, this is an exact mapping. Original number is converted into a string and saved into the new variable . Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. How could my characters be tricked into thinking they are on Mars? For example, if the user enters 123 as input, 321 is displayed as output. How can I make a dictionary (dict) from separate lists of keys and values? Ready to optimize your JavaScript with Rust? like shown in the program given below. Using while loop; Using recursion; Reverse a number using Python while loop. 4321. We will take integer numbers as a string while declaring the variables. I am trying to write a program to convert a base 10 (decimal) number into a base 4 number. The recursive function is called by passing the string value into his parameter. Finally, the result will be displayed on the screen. Step 1: Import Pandas import pandas as pd. Code: Check whether the given number is greater than zero using while loop. The consent submitted will only be used for data processing originating from this website. Where does the idea of selling dragon parts come from? So we strip this off using .lstrip("0"). How do I reverse a list or loop over it backwards? Function reverse is having integer (num) as input parameter's. Brief editorial: Palindrome: Input number = reversed number. this could also be written as hex(num)[2:]). Take an input number from user. Should teachers encourage good students to help weaker ones? Create a variable called "reverse" and set its initial value to "0.". The value of x indicates the total digit of given number. . How can I remove a key from a Python dictionary? Making statements based on opinion; back them up with references or personal experience. TUTORIALS ON LINUX, PROGRAMMING & TECHNOLOGY. It is also possible to use a recursive approach such as, This works in the same way as the one you have, except that it solves your problem by appending the mod part to the string after the recursive call returns. Space Complexity: O(1) will be the space complexity as there is no extra space used in reversing the number. I don't quite understand the purpose of the. Your email address will not be published. Fix: chown operation not permitted error, Set up LAMP(Linux, Apache, MySQL, PHP) Stack on Ubuntu 22.04, Method 1: Using a While loop to Reverse a Number in Python, Method 2: Using reversed() Method to Reverse a Number in Python, Method 3: Using the Recursion Method to Reverse a Number in Python, Method 4: Using For Loop to Reverse a Number in Python, Method 5: Using String Slicing to Reverse a Number in Python, Python re.sub() Method | Replace Strings Using Regex, The reversed variables value is multiplied by . Manage SettingsContinue with Recommended Cookies. When user enters the number say 236, it gets stored in num.So num=236; The condition (of while loop) num!=0 or 236!=0 evaluates to be true, therefore program flow goes inside the loop and executes all the three statements present inside the block of this loop; So num%10 or 236%10 or 6 gets initialized to rem You could build the integer one digit at a time, then print it: You can use a list to store your result then print the list in reverse order. How can I randomly select an item from a list? Secondly, what is the purpose of the 'result' variable which acts as an accumulator? Thanks for your response :), Thanks for the explanation. The algorithm is defined inside the while loop, and it will run until the original number is not equal to zero. How to Download Instagram profile pic using Python, Loop while number > 0 Loop while number > 0, Multiply reverse_number by 10 and add the remainder to reverse_number like below, reverse_number = (reverse_number * 10) + remainder. . Now check if the provided number is bigger than zero. Star pattern programs in Python using while loop | In the below pattern program, we will print the left half pyramid. Why is apparent power not measured in Watts? Join the list using join() function to get reversed string. Is there a higher analog of "category with all same side inverses is a groupoid"? Some of our partners may process your data as a part of their legitimate business interest without asking for consent. We and our partners use cookies to Store and/or access information on a device.We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.An example of data being processed may be a unique identifier stored in a cookie. one reverse triangle, and the . To perform any operation on a number, we convert the string value back into the integer using the int() function. Step 5: startIndex = 0; lastIndex = size - 1; while lastIndex>=0: revArr.append (arr [lastIndex]) Algorithm to print an array (list) in reverse order using while loop. let us take a look at the Python program to implement the same. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Output: Explanation of the above code: As one can see, "open ('Emp_Info. Divide the given number by 10 to remove the last digit. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? rev() is implemented here to return reverse of a number. Repeat this process from 3 to 6 until the number becomes 0. The result obtained from reversed order is concatenated into a string with the help of the join() function.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'itslinuxfoss_com-leader-2','ezslot_7',174,'0','0'])};__ez_fad_position('div-gpt-ad-itslinuxfoss_com-leader-2-0'); Lets understand this method by an example given below:if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'itslinuxfoss_com-leader-4','ezslot_12',173,'0','0'])};__ez_fad_position('div-gpt-ad-itslinuxfoss_com-leader-4-0'); Note: The int() function is used to convert the string value back into the integer for further calculation. How to smoothen the round border of a created buffer to make it look more natural? Sample Input/ Output:-Enter the number of . However since the base-4 value of 45 is 231, I want that output to be reversed to 231. number = 67890 reversed_number = 0 while number != 0: digit = number % 10 reversed_number = reversed . We can also take the help of a function to reverse a number in python using for loop. Then, find the reverse of the number using for loop. This program iterates each digit to inverse them. Reverse a given number using while loop. Here it gives the correct result as their are no trailing zeroes. Write a Python program to reverse a user defined value, using while loop , Complete Explanation #python #coding #reverse Python makes it easy to reverse a number by using a while loop. In Python, the for loop, while loop, string slicing, recursive method, and reversed() function are used to reverse a number. This article is created to cover some programs in Python, that find and prints reverse of a number entered by user. Here is its answer: Now supply the input say 236 as number, press ENTER key to find and print its reverse like shown in the snapshot given below: The dry run of above program with 236 as user input, goes like: I've included try-except block in this program, to handle with invalid inputs. Do these processes until the number becomes zero. Connect and share knowledge within a single location that is structured and easy to search. The original number is divided to eliminate the last digit. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). Here we will write the program which takes input number and reversed the same. The easiest way to convert the number into base 4 is to first convert the number into hexadecimal (base 16) using Python's built-in facilities, then map each hex digit to two base-4 digits. Now this program uses list to reverse a given number. I am having difficulties joining the integer outputs from the while loop, and reversing the same. Print the reversed number. Next, it prints natural numbers from the user-specified value to 1 using a while loop. The output shows the reversed number of the original number. We use the modulo operator (%) in the program to get the digits of a . Set the variable reverse_number to 0. Thanks for your help :), I wanted to write a code without the help of Python's modules. Then, call the function and finally, the result will be displayed on the screen. @abruzzi26 Which part don't you understand? Other methods like for loop and while loop define their algorithm inside the main body to reverse the number. Take a integer number as input from the user and write a Python Function to reverse the given number and check whether the given number is "palindrome" or "not palindrome". # Python Program to Reverse a Number using Recursion Num = int . We join the resulting strings with the null string, resulting in a single string with all the numbers in order. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Step 4: Add elements to the list. Consider storing it the digits in a list and printing the list in reverse. Your title implies the former but your code seems to be trying to do the latter. One more thing: why is the result variable initialized to "", and not 0? This is the last program of this article, created using a recursive function. Let the calling code print it if it wants. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Reverse a Number in Python using For Loop. Let's understand the following methods of reversing the integer number. For example, if given number is 549, then using the following statement: the length of str(549) or "549" gets initialized to numlen, that is 3. This code is little complicated for me since I haven't reached this level yet. This method is used to get the substring from the end/start side of the string with the help of an index number. If both numbers exactly matched, then it is a Python Palindrome number. numbers = [66, 78, 2, 45, 97, 17, 34, 105, 44, 52] #include <iostream>. Why have you initialized it to ""? Reverse a number python: There are several ways to reverse the given number in python some of them are: Using while loop; Using for loop and string concatenation; Using Slicing; Using list and join functions; Explore more instances related to python concepts from Python Programming Examples Guide and get promoted from beginner to professional . For an assignment, I need to use a while loop to reverse a list, and I just can't do it. How do I select rows from a DataFrame based on column values? I'm building up the result, then reversing it, then printing it. skip insertion of an automatic newline. Output:-if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'knowprogram_com-banner-1','ezslot_10',138,'0','0'])};__ez_fad_position('div-gpt-ad-knowprogram_com-banner-1-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'knowprogram_com-banner-1','ezslot_11',138,'0','1'])};__ez_fad_position('div-gpt-ad-knowprogram_com-banner-1-0_1');.banner-1-multi-138{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:0!important;margin-right:0!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}, Enter the number: 765496The reverse number is = 694567. This will reverse the list: >>> l1 = [1, 2, 3] >>> l2 = while_version (l) >>> l2 [3, 2, 1] Note, however, that it also empties the original list: rev2022.12.9.43105. There are several ways to reverse the given number in python some of them are: Explore more instances related to python concepts fromPython Programming ExamplesGuide and get promoted from beginner to professional programmer level in Python Programming Language. How to use While loop in python | Python Reverse number program| While loop applicationHi, I am Sanjay Parmar, Welcome to my youtube channel TutorialAICSIP.I. Utilizing the mod (%) operator, find the remaining portion for the specified . The following code (from above program): is used to execute following statements (present inside the block of above for loop): numlen number of times. How to get synonyms/antonyms from NLTK WordNet in Python? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Some methods convert the original number into a string and then perform string methods to reverse the number. The given code below explained the working of while loop to get the reverse number in . The or "0" restores the "0" in the case of an empty string. The append() is used to add or append new element (number here) at the end of list. # Python program to reverse a number using while loop # take inputs num = 12345 # calculate reverse of number reverse = 0 while(num > 0): last_digit = num % 10 reverse = reverse * 10 + last_digit num = num // 10 # display result . Step 1: Start. Using the slicing technique, we have to convert the number to string and then reverse it. The question is, write a Python program to reverse a number. Guide to Reverse Numbers in Python. Python reversed() method returns an iterator that accesses the given sequence in the reverse order.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'knowprogram_com-large-leaderboard-2','ezslot_12',116,'0','0'])};__ez_fad_position('div-gpt-ad-knowprogram_com-large-leaderboard-2-0'); Enter a number: 980456The reverse number is:654089, Your email address will not be published. Better way to check if an element only exists in one array. Numbers can be reversed in Python using different methods. I don't know Python, but it's clear that your While loop is going to be looking at the variable "index" (so, "while index > 0"). This python program to reverse a number allows the user to enter any positive integer using a while loop. the argument corresponds to rev (as defined in previous programs), with its initial value as 0, This process continues until the condition evaluates to be false, In this way, after exiting from the loop, the variable. We initialized a while loop with a value of the string. Since each base-4 digit represents 2 bits, and each base-16 digit represents 4 bits, this is an exact mapping. MENU MENU. Time Complexity: O(log(n)) will be the time complexity for reversing the number where n is the input number. Reverse the list using reverse() function. EDUCBA. If yes, find the remainder by performing modulus of 10 with the input. In Python, the number is reversed to carry out any specific logical operation. run 2 nested loops where the internal loop will run for N number of times as the N number of times the external loop has run and print star pattern. Take input from the user in program. The second argument passed to this function is In this program, while loop is used to reverse a number as given in the following steps: First, the remainder of the num divided by 10 is stored in the variable digit. Write a number as a sum of Fibonacci numbers Find centralized, trusted content and collaborate around the technologies you use most. Given a number, thee task is to reverse the given number in Python. That is, a recursive function named Otherwise, it is not a Palindrome number. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The given code below explained the working of while loop to get the reverse number in Python: The output shows the reversed number of the original input number. Did the apostolic or early church fathers acknowledge Papal infallibility? Lets understand the concept by an example given below: The above output shows the reverse number of the original number. We can reverse the integer number in Python using the different methods. When the object is a string, the len() function returns the number of characters in the string. How to set a newcommand to be incompressible by justification? Remove the last digit of the number. Traverse every character of the string using for loop in reverse order using range function. That's the point of my answer. The end used here to If you look at my code, I have included the print statement within the while loop. The len() function returns the number of items in an object. Why is yours outside the loop? Program Description:- Write a program to reverse a number in Python, Output:-if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'knowprogram_com-medrectangle-3','ezslot_1',121,'0','0'])};__ez_fad_position('div-gpt-ad-knowprogram_com-medrectangle-3-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'knowprogram_com-medrectangle-3','ezslot_2',121,'0','1'])};__ez_fad_position('div-gpt-ad-knowprogram_com-medrectangle-3-0_1');.medrectangle-3-multi-121{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:0!important;margin-right:0!important;margin-top:7px!important;max-width:100%!important;min-height:50px;padding:0;text-align:center!important}, In the previous program, inputs are hardcoded in the program but in this program, input will be provided by the user.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'knowprogram_com-medrectangle-4','ezslot_6',122,'0','0'])};__ez_fad_position('div-gpt-ad-knowprogram_com-medrectangle-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'knowprogram_com-medrectangle-4','ezslot_7',122,'0','1'])};__ez_fad_position('div-gpt-ad-knowprogram_com-medrectangle-4-0_1');.medrectangle-4-multi-122{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:0!important;margin-right:0!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}, Output for the input values test-case-1:-, Enter the number: 984061The reverse number is = 160489, Output for the input values test-case-2:-if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'knowprogram_com-box-4','ezslot_8',123,'0','0'])};__ez_fad_position('div-gpt-ad-knowprogram_com-box-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'knowprogram_com-box-4','ezslot_9',123,'0','1'])};__ez_fad_position('div-gpt-ad-knowprogram_com-box-4-0_1');.box-4-multi-123{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:0!important;margin-right:0!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}, Enter the number: 49815The reverse number is = 51894. The easiest way to convert the number into base 4 is to first convert the number into hexadecimal (base 16) using Python's built-in facilities, then map each hex digit to two base-4 digits. while loop in pythonwap to reverse a numberinput -: 7546ouput -: 6457new video for python programmingpython code for problem solving approach.- python for be. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. Your email with us is completely safe, subscribe and start growing! Using the input () or raw_input () methods, the input number can be read. The original value is converted into a string. Note - The statements inside for loop gets executed x number of times. Like loop or Recursion can use to reverse a number in python. Add that last digit to the temporary variable. Constraints: 1 <= integer <= 106. I would appreciate if you could explain the purpose of the result variable. This article discloses the Python Program to Reverse a Number using Python While Loop, Functions, and Recursion. Thanks for your help :), Nice alternative. ('Reversing the given number using while loop =', reverse_while_loop(my_number)) Output: 4. In Python, a while loop is also used to reverse any number or character with the help of a simple algorithm. Scan the given number. How do I print curly-brace characters in a string while using .format? For each iteration in the loop, we yield DIGIT_MAP[c], which is the two base-4 digits that are equivalent to the given base-16 digit. We will take integer numbers as a string while declaring the variables. Here it also prints the leading zeroes so to avoid this the solution is given below. We will take integer numbers while declaring the variables. The output shows the reverse number of the original number. Method 1: Using a While Loop. So numlen=3. Define 0 to the variable "test_num". We use a while loop with the help of both floor division and the modulus % operator.. Let's take a look at an example to see how this works and then dive into the why of this works:. Divide the given number by 10 to remove the last digit. # Python program to reverse a number using function def findReverse(n): #user-defined function # calculate reverse of number reverse = 0 reminder = 0 while(n != 0): remainder = n % 10 reverse = reverse . Algorithm to Reverse a Number using Recursion. Sample test . Program Description:- Write a program to reverse a number in . Reverse a Number using For Loop in Python. We will take an integer number while declaring the variables. First, we understand the algorithm of this . You're just printing it in the wrong order. Thanks for the simply modified code. Using this method, the function is defined at once and calls the function automatically until the given number reaches its last index position. Here is its sample run with user input 549: This program uses for loop to do the same job, that is of reversing a number. This program uses a user-defined function named rev(), that returns reverse of a number passed as its argument. Example of reverse number:-Number: 49813 Reverse Number: 31894. Reverse a Python Number Using a While Loop. TypeError: unsupported operand type(s) for *: 'IntVar' and 'float'. 4. digit is then added to the variable reversed after multiplying it by 10. Therefore both statements present inside for loop's block, executes 3 times. The result may have a leading zero since any hex digit less than 4 results in a base-4 digit-pair starting with 0. Following picture presents a sample input and output for . . Multiplication by 10 adds a new place in the . The simplest way would be: def while_version (items): new_list = [] while items: # i.e. # Initiate value to null test_num = 0 # Check using while loop while . Finally, the result will be displayed on the screen. While it's a mere 20% for most parsers, PapaParse was 2x slower with fast-mode disabled. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Connecting three parallel LED strips to the same power supply. So if you did the append in the reverse order, you are back to the same problem again. The reversed() method reverses the number or string by iterating it in reverse order. Example of reverse number:-Number: 49813Reverse Number: 31894if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'knowprogram_com-box-3','ezslot_3',114,'0','0'])};__ez_fad_position('div-gpt-ad-knowprogram_com-box-3-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'knowprogram_com-box-3','ezslot_4',114,'0','1'])};__ez_fad_position('div-gpt-ad-knowprogram_com-box-3-0_1');.box-3-multi-114{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:0!important;margin-right:0!important;margin-top:7px!important;max-width:100%!important;min-height:50px;padding:0;text-align:center!important}. The recursive function adds the first digit to the end of the list and calls itself several times in a program until the original number value reaches the last index number. Sometimes, in a programming language, there is a need for reverse numbers in code to process data. This post briefly covered all the methods to reverse a number in Python with numerous examples. 1: Python Program to Reverse a Number using While loop. # Python Program to Print Natural Numbers in Reverse Order number = int (input ("Please Enter any Number: ")) i = number print ("List of Natural Numbers from {0} to 1 in Reverse Order : ".format (number)) while ( i >= 1): print (i, end = ' ') i = i - 1 . Python Program to Reverse a Number Using While Loop. 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We will develop a program to reverse a string in python using while loop. The following C program reverses the number entered by the user, and then displays the reversed number on the screen. Convert this string to list of digits using list() function. We could also use hex(), but this adds a leading 0x to the conversion, which we'd then have to strip off (i.e. How to reverse integer values from a while loop? How can I do that? Take the number num as input from the user. A function is a block of code that performs a specific task. The algorithm is defined inside the while loop, and it will run until the original number is not " equal to zero ". To learn more, see our tips on writing great answers. Find the last digit of the number. Lets understand the concept of the recursive function used to reverse a number in python by the following code. Asking for help, clarification, or responding to other answers. First, we convert the incoming number to hex using "%x" % num. Python provides csv module to do read-write operations on a csv file. The while loop iteration will continue until the condition . Python Program to Check Armstrong Number using while loop. And the str() method converts into a string type value. 1: Python Palindrome Program using While Loop. 1. Also, according to what I have learnt, I would initialize this to 0. Python program to reverse a number; Using loops; . Here we discuss the logic in it and to find the reverse number of a given number in python respectively. Now, the digit contains the last digit of num, i.e. It's basically the same thing but in reverse order. until it's an empty list new_list.append (items.pop (-1)) return new_list. This write-up will provide a detailed understanding of the following terminologies: In Python, a while loop is also used to reverse any number or character with the help of a simple algorithm. To reverse a number we need to extract the last digit of the number and add that number into a temporary variable with some calculation, then remove the last digit of the number. @abruzzi26 There are 2 return statements which one is confusing you? Reversing means that the last digit will come at the beginning and the second last will come after that, and so on. Lets understand with the following example: Note: The int() function is used to convert the string value back into the integer for further calculation. 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