How to reverse a number in PythonIt is the most asked programming question in the interview. We can reverse the integer number in Python using the different methods. Here we will write the program which takes input number and reversed the same. Let's understand the following methods of reversing the integer number.
Reverse a number using Python while loopFirst, we understand the algorithm of this program. It will make easy to understand the program logic. Once you get the logic, you can write the program in any language, not only Python. AlgorithmLet's implement the above algorithm in program. ProgramOutput: Enter the integer number: 12345 The reverse number is: 54321 Explanation - Let's understand this program step by step. We initialed a number variable for user input and variable revs_number initial value to null. First Iteration Reminder = number %10 Reminder = 12345%10 = 5 Reverse = Reverse *10 + Reminder Initial value of revs_number is null Reverse = 0 * 10 + 5 = 0 + 5 = 5 Number = Number //10 Number = 1234 //10 = 1234 // Now loop will iterate on this number. Second Iteration Now the number is 123, and the revs_number is 5. The while checks its condition and executes for the next iteration. Reminder = Number % 10 Reminder = 1234 % 10 = 4 Reverse = Reverse *10+ Reminder = 5 * 10 + 4 Reverse = 50 + 4 = 54 Number = Number //10 = 12345 //10 Number = 123 Third Iteration From the Second Iteration, the values of both Number and Reverse have been changed as: number = 123 and revs_number = 54 Reminder = Number %10 Reminder = 123%10 = 3 Reverse = Reverse *10+ Reminder = 54 * 10 + 3 Reverse = 540 + 3 = 543 Number = Number //10 = 123//10 Number = 12 Fourth Iteration The modified number is 12 and the revs_number is 543: Now while executes again. Reminder = Number %10 Reminder = 12 %10 = 2 Reverse = Reverse *10+ Reminder = 543 * 10 + 2 Reverse = 5430 + 2 = 5432 Number = Number //10 = 12//10 Number = 1 Fifth Iteration Reminder = Number %10 Reminder = 1 %1 0 = 1 Reverse = Reverse *10+ Reminder = 5432 * 10 + 1 Reverse = 54320 + 1 = 54321 while loop is terminated because if found the false as a Boolean result. You can enter the different number and check the result. Reverse a Number Using RecursionLet's understand the following example. Output: Enter the number: 5426 The Reverse of entered number is = 6245 Logic is same in both programs. Once you understand the logic, it will easy to do it by own. Next TopicWhat is an object in Python |
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