So, to add another number 4 after 123, we need to shift the current numbers to the left, so now 1 is in the thousandth place, 2 in the oneth place, 3 is in the onethplace and 4 in the zeroth place. We can reverse a number in Java using three main methods as mentioned below: Using While Loop. Add the modulus and reverse number. C++ Program to Reverse a Number. Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Top 100 DSA Interview Questions Topic-wise, Top 20 Interview Questions on Greedy Algorithms, Top 20 Interview Questions on Dynamic Programming, Top 50 Problems on Dynamic Programming (DP), Commonly Asked Data Structure Interview Questions, Top 20 Puzzles Commonly Asked During SDE Interviews, Top 10 System Design Interview Questions and Answers, Business Studies - Paper 2019 Code (66-2-1), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Count of N digit numbers having absolute difference between adjacent digits as K, Recursive sum of digits of a number formed by repeated appends, Count pairs up to N having sum equal to their XOR, Print last k digits of a^b (a raised to power b), Find count of digits in a number that divide the number, Divisibility by 3 where each digit is the sum of all prefix digits modulo 10, Nearest greater number by interchanging the digits, Count N-digit numbers whose digits does not exceed absolute difference of the two previous digits, Find the first and last M digits from K-th power of N, Sum of the products of same placed digits of two numbers, Find last two digits of sum of N factorials, Count numbers formed by given two digit with sum having given digits, N digit numbers having difference between the first and last digits as K, Program to find last digit of nth Fibonacci Number, Check if sum of array can be made equal to X by removing either the first or last digits of every array element. Divide the original number by 10 to remove last digit, which is not needed anymore. What is Stack ? Write an Efficient C Program to Reverse Bits of a Number. Join our newsletter for the latest updates. Learn C++ practically How has it impacted your learning journey? In the above program, use is asked to enter a positive number which is stored in the variable num. The reverse of a number means reversing the order of digits of a number. This C program reverse the number entered by the user, and then prints the reversed number on the screen. Stack is an abstract data type with a bounded (predefined) capacity. If the reversed integer is equal to the integer entered by user then, that number is a palindrome if not that number is not a palindrome. In each iteration, the remainder when the value of n is divided by 10 is calculated, reversed_number is computed and the value of n is decreased 10 fold. Learn C practically You can now try using the logic in different ways and create complex programs requiring reversing a number. This blog show how to print reverse a number in C# language. If original is equal to reversed, the number entered by the user is a palindrome. Reversing a number in C programming means changing all the digits of a number to bring the digit at the last position to the first position and vice-versa. Learn C++ practically Logic to find reverse of a number in C programming. Reverse Number of abcde = edcba. rev_Num=rev_Num*10+remainder; printf("Reverse of %d is %d",a,rev_Num); Here, we will create a function in the main method and use the algorithm inside it to calculate the reverse of the number entered by the user. How to reverse a given number in C#? The flowchart and algorithm remain the same. When the do while loop finally ends, we have a reversed number in rev. The value of num is updated by dividing it by 10, (num = num / 10). x = x * 10 + mod; If you want to print 001 then see this comment from Maheshwar. printf("\nEnter the number to reverse: "); printf("Reverse of %d is = %d\n", Num, Rev); Rev = Rev *10+ remainder; In this article, you have learned everything you needed to know about a C program to reverse a number. But how do we build the logic to make that happen through a program? For example reverse of 839 is 938. Write C++ program to calculate compound Interest. Reverse an Integer #include <stdio.h> int main() { int n, reverse = 0, remainder; printf("Enter an integer: "); scanf("%d", &n); while (n != 0) { remainder = n % 10; reverse = reverse * 10 + remainder; n /= 10; } printf("Reversed number = %d", reverse); return 0; } Run Code Output Enter an integer: 2345 Reversed number = 5432 mod = num%10; The reverse of 12345 is: 54321 Enter a positive integer: 852314 The reverse of 852314 is: 413258 In this C program to reverse a number using function, we defined a function findReverse() which return type is int and takes an int argument. If you want to learn more about such fundamentals, you can sign up on our SkillUp platform. The Ultimate Guide to Top Front End and Back End Programming Languages for 2021, C++ Recursion: Understanding Its Concept and Working, Combating the Global Talent Shortage Through Skill Development Programs, C Program to Find the Factorial of a Number, An Ultimate Guide That Helps You Build C# Game Programming, C Program to Reverse A Number Using Different Methods, Full-Stack Web Development Certification Course, Cloud Architect Certification Training Course, DevOps Engineer Certification Training Course, ITIL 4 Foundation Certification Training Course, Leading SAFe 6 training with SAFe Agilist Certification. In each iteration of the loop, the remainder when n is divided by 10 is calculated and the value of n is reduced by 10 times. Share your suggestions to enhance the article. Reverse a Number Using the While Loop. It also provides you with a certification that gives credibility to your skills. Developed by JavaTpoint. Display Armstrong Number Between Two Intervals, Check Whether a Number can be Express as Sum of Two Prime Numbers. Using Recursion. Reverse of number means reverse the position of all digits of any number. Method1 - Simple: Loop through all the bits of an integer. This number is then compared to the original number n. If the numbers are equal, the original number is a palindrome, otherwise it's not. Write a program to reverse the digits of an integer. Contribute your expertise and make a difference in the GeeksforGeeks portal. We will divide the given number into two parts after this, reverse the first half and second half and join them. The algorithm and logic mentioned in the previous section can be demonstrated using the following flowchart: Using the above flowchart, we can create a C program to reverse a number using various methods. Divide a given number by 10 Repeat the step from 2 to 6 until the output comes. But if length is known, its far easier to find . 1. We will implement a program in C, C++, Python, and Java. When the number goes below 0, the Reversed_Number variable will have the result. // Here we're converting the result of the same functions used in the above example to // an Integer and multiplying it by the value returned from the Math.sign() function. For Example: Input: Enter first number: 56 Enter second number:89 Output: reverse of first number: 65 reverse of second number:98 sum of two reverse no is: 163 reverse of sum: 361 C# Code: 2023 C# Corner. The program allows the user to enter a number and it displays the reverse pattern of the given number using for loop in C++ language. Ask to User Enter . This program reverses the array elements. The number is stored in variable n. We then assigned this number to another variable orignal. and Get Certified. Check Whether a character is Vowel or Consonant. Heres the implementation of the program using the while loop. In the above program, use is asked to enter a positive number which is stored in the variable num. Logic of Reversing Number in C++ The logic of reversing a number in C++ is very simple, we will use super basic arithmetic operators ( \times, \div, \%, \text {etc.} We will convert the number to a string using StringBuffer after this, we will reverse that string using the reverse() method. We use modulus (%) operator in program to obtain the digits of a number. Reverse a Number in C using Function #include <stdio.h> //function to reverse the given number reverse(int nbr) { int reversedNbr=0; while (nbr!=0) { reversedNbr = reversedNbr * 10 + nbr%10; nbr /= 10; } return reversedNbr; } The below program can be used to reverse a given number using a loop. For example if a is an array of integers with three elements such that a [0] = 1 a [1] = 2 a [2] = 3 Then on reversing the array will be a [0] = 3 a [1] = 2 a [0] = 1 Given below is the c code to reverse an array. Reversing a number involves changing the order of the digits in a number so that the last digit becomes the first, the second-to-last digit becomes the second, and so on. There are many methods to reverse a number in C++ we will see it one by one. and Get Certified. Inside the do.while loop, last digit of the number is separated using the code digit = num % 10;. Inside the findReverse() function sum is declared and initialized with value 0. Simply apply the steps/algorithm discussed and terminate the loop when the number becomes zero. Now divide the number by 10 and store the remainder in another variable. Lets find out. This digit is then added to rev_num after multiplying it by 10, which means the existing digits of rev_num are shifted one place to the left. Hence, we wont have to use any loop in this example. For example if user enter 423 as input then 324 is printed as output. This digit is then added to the rev variable. Time Complexity: O(n), where n is the input numberAuxiliary Space: O(1). For example if user enter 423 as input then 324 is printed as output. Reverse Number Program in C Read Discuss Courses Practice The reverse of a number means reversing the order of digits of a number. Suppose you take the number 1234; the reverse is 4321. Check Whether a Number is Palindrome or Not. Algorithm to Reverse an Integer C Program to reverse the digits of a number using recursion, C Program to Reverse a Stack using Recursion, Program to Reverse a String using Pointers, C Program To Reverse Words In A Given String, C# Program To Reverse Words In A Given String, C Program To Print Reverse Floyd's Pattern, C Program to Reverse a String Using Recursion, A-143, 9th Floor, Sovereign Corporate Tower, Sector-136, Noida, Uttar Pradesh - 201305, We use cookies to ensure you have the best browsing experience on our website.