Please use ide.geeksforgeeks.org, generate link and share the link here. The logic behind to implement this program - Input Number, and run a loop until number is greater than 0, using remainder (Modulus) operator extract last digits and then dividing by 10, last digits will be removed. Logic to print array in reverse order. RECURSIVE WAY ITERATIVE WAYAlgorithm: Input: num (1) Initialize rev_num = 0 (2) Loop while num > 0 (a) Multiply rev_num by 10 and add remainder of num divide by 10 to rev_num rev_num = rev_num*10 + num%10; (b) Divide num by 10 (3) Return rev_num. Working: First the computer reads a number from the user. For example, for 100 program will print 1. In the above program we learnt how to reverse a number using recursive function. Attention reader! Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest, .. calculate cube = (a * a * a) Step 3: Print the output. Condition: You are not allowed to use modulo or % operator.. Extract last digit of the given number … Note that above above program doesn’t consider leading zeroes. Design an algorithm to find a reverse of number? Instead it just prints array in reverse order. Read it and store it in the num variable. Double the first element and move zero to end, Reorder an array according to given indexes, Arrange given numbers to form the biggest number | Set 1, Arrange given numbers to form the biggest number | Set 2, Find the largest number that can be formed with the given digits, Find next greater number with same set of digits, Finding sum of digits of a number until sum becomes single digit, Program for Sum of the digits of a given number, Compute sum of digits in all numbers from 1 to n, Count possible ways to construct buildings, Maximum profit by buying and selling a share at most twice, Maximum profit by buying and selling a share at most k times, Write a program to print all permutations of a given string, Set in C++ Standard Template Library (STL), Write an Efficient C Program to Reverse Bits of a Number, C Program to reverse the digits of a number using recursion, Numbers of Length N having digits A and B and whose sum of digits contain only digits A and B, Minimum digits to be removed to make either all digits or alternating digits same, Find N numbers such that a number and its reverse are divisible by sum of its digits, Find smallest number with given number of digits and sum of digits, Find the Largest number with given number of digits and sum of digits, Number of digits in the nth number made of given four digits, Count of integers in a range which have even number of odd digits and odd number of even digits, Find smallest number with given number of digits and sum of digits under given constraints, Number formed by deleting digits such that sum of the digits becomes even and the number odd, Smallest number with given sum of digits and sum of square of digits, Minimum number of digits to be removed so that no two consecutive digits are same, Check whether product of digits at even places is divisible by sum of digits at odd place of a number, Count of numbers between range having only non-zero digits whose sum of digits is N and number is divisible by M, Maximize the given number by replacing a segment of digits with the alternate digits given, Find the average of k digits from the beginning and l digits from the end of the given number, Check if the sum of digits of number is divisible by all of its digits, Program to find GCD or HCF of two numbers, Given an array A[] and a number x, check for pair in A[] with sum as x, Print all possible combinations of r elements in a given array of size n, Write Interview Suppose we found element 4 at position 3 in an array, then in reverse permutation, we insert 3 (position of element 4 in the array) in position 4 (element value). Divide the number by 10. We can draft the algorithm in three steps. CPP04 – (a) Write a CPP program to print the factorial of a given number. Algorithm: Step 1: Start Step 2: Read number n Step 3: Set f=1 Step 4: Repeat step 5 and step6 while n>0 Step 5: Set f=f*n Step 6: Set n=n-1 Step 7: Print factorial f Step 8: Stop Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready. Objec­tive: Write Given two integers ‘number’ and ‘divisor’, Write an algorithm to find the remainder if ‘number’ is divided by ‘divisor’.. Please write to us at [email protected] to report any issue with the above content. Step 2: Take any number and store it in n. Step 3: if n=multiple of 2 print "even" else print "odd" Step 4: Stop. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Write a program to reverse digits of a number, Write a program to reverse an array or string, Rearrange array such that arr[i] >= arr[j] if i is even and arr[i]<=arr[j] if i is odd and j < i, Rearrange positive and negative numbers in O(n) time and O(1) extra space, Rearrange array in alternating positive & negative items with O(1) extra space | Set 1, Rearrange array in alternating positive & negative items with O(1) extra space | Set 2, Move all zeroes to end of array | Set-2 (Using single traversal), Minimum swaps required to bring all elements less than or equal to k together, Rearrange positive and negative numbers using inbuilt sort function, Rearrange array such that even positioned are greater than odd. Experience. Write a program to reverse digits of a number; Find N numbers such that a number and its reverse are divisible by sum of its digits; C Program to reverse the digits of a number using recursion; Print first k digits of 1/n where n is a positive integer; Count even and odd digits in an Integer If you want to print 001 then see this comment from Maheshwar. num = num/10 = 45, rev_num = rev_num *10 + num%10 = 260 + 5 = 265 Basic C programming, If else, Functions, Recursion. The array should contain element from 1 to array_size. Algorithm to reverse digits of a number in Java programming language. #include int main() { int n, rev = 0, remainder; printf("Enter an integer: "); scanf("%d", &n); while (n != 0) { remainder = n % 10; rev = rev * 10 + remainder; n /= 10; } printf("Reversed number = %d", rev); return 0; } About Adeeb, C Program to Find Maximum and Minimum Number in An Array with Algorithm, Create Dynamic XML Sitemap in Codeigniter App – Easily, Open or Launch URL in Browser from Android App, C Program to Print Fibonacci Series – with and without using Recursion, C Programs to Print Half Pyramid, Full Pyramid (Star and Number). This algorithm in real does not produces a reversed array. I am coding in C on linux, and I need to reverse a number. Write an algorithm and draw the flowchart to find the largest number among the three numbers? There are three ways to reverse a number in Java: Reverse a number using while loop; Reverse a number using for loop Program 1: Reverse a number using while Loop. Now, let’s write a program that can help us understand some key programming concepts and save us some time. Logic to find reverse of a number. An example of an algorithm that will reverse a number is written as such, digit reverse(num), while (num>0) then, digit =num%10. Input a number from user to find reverse. However, unknowingly we are wasting some memory to store reverse array. Please refer to Python Program to Reverse an Integer Using While Loop Analysis. The program will prompt user to input the number and then it will reverse the same number using while loop. Find no of reverse pairs in an array which is sorted in two parts in O(N) Print Stack in reverse order. Write an algorithm and draw the flowchart to find whether a given number is even or odd? Related: Reverse of a Number using while loop in C++. Repeat the above steps until the number becomes 0. Thanks to Raj for adding this to the original post. Explanation : The commented numbers in the above program denote the step numbers below : Ask the user to enter a number. Write an algorithm an draw flowchart to find factorial of a number? There are three ways to reverse a number in Java. Here we would learn how to do it using while loop. C Program to Check Whether a Number is Palindrome or Not In this example, you will learn to check whether the number entered by the user is a palindrome or not. rev_num = rev_num *10 + num%10 = 2 Step by step working of the above C program: Let us assume a number entered is 123. Here we are using the adjacency list to represent the graph.Traverse each adjacency list and while traversing keep adding the reverse edges (making source as destination and destination as source). Write a C program to find the sum of digits and the reverse of a number. num = num/10 = 0, edit Reverse digits of an integer with overflow handled. Declare and initialize another variable to store reverse of num, say reverse = 0. This is the C program code and algorithm for finding the sum of digits and reverse of a number. Learn How To Reverse A Number in C Programming Language. Traverse the given graph. CPP03 – Write a CPP program to find the maximum marks, average-marks and minimum marks obtained by a study in five papers given; CPP02 – Write a CPP program to explain the use of for loop, while loop, switch-case, break and continue statements. Aim: Write a C program to find the factorial of a given number. Basically, An inverse permutation is a permutation in which each number and the number of the place which it occupies is exchanged. An example of an algorithm that will reverse a number is written as such, digit reverse(num), while (num>0) then, digit =num%10. Then using while loop the reverse number is calculated and stored in the variable ‘s’. To understand this example, you should have the knowledge of the following C programming topics: C program to reverse a number and to print it on the screen. Enter any number: 23456 After reverse the no is :65432 Reversing a number using While loop. Example: num = 4562. rev_num = 0. rev_num = rev_num *10 + num%10 = 2. num = num/10 = 456. To invert the number write its digits from right to left. Multiply the variable reverse by 10 and add the remainder into it. In this program, we will read an integer number and check whether it is Palindrome Number or not, to check Palindrome Number firstly we will calculate it’s Reverse Number. Must know - Program to find reverse of a number using loop Declare recursive function to find reverse of a number. It is important that we should know How A For Loop Works before getting further with this C Program Code.. To Reverse the Digits of an Integer, we need to Extract every End Digit using Modulus Operator and then store it in a Sum variable. Reverse an Integer. This is the algorithm to print reverse of an accepted number; n- Accepted number; r- variable for remainder; rev- the reverse of a number Example:. Adeeb C is a Web Designer, Web Application Developer, Android App Developer, WordPress Developer, Professional Blogger. CPP04 – (a) Write a CPP program to print the factorial of a given number. Here’s a simpler solution (by “simpler” I mean, in this case, that it doesn’t use logarithms) which I’ve put together in Foxo, an online tool for creating flowcharts that can actually be executed. Recall the name of a person whose number you wrote down. We also manually evaluated the results by considering an example. Finding the cube of given number. First Iteration Reminder = Number %10 Reminder = 1456%10 = 6 This program will read an integer positive number and reverse that number.For Example input number is 1234 after reversing number will be 4321. ; The function computes reverse of number, hence it must accept an integer parameter. Calculate tax on income as per given tax brackets. Algorithm: Step 1: Start Step 2: Read number num Step 3: Set sum=0 and rev=0 Step 4: Repeat step 5 to 8 while num Step 5: Set d=num mod 10 Step 6: Set num=num/10 Step 7: Set sum=sum+d Step 8: Set rev=rev*10+d Step 9: Print sum Step 10: Print rev Step 11: Stop Algorithm: Step 1: Start Step 2: Read number n Step 3: Set f=1 Step 4: Repeat step 5 and step6 while n>0 Step 5: Set f=f*n Step […] The program will prompt user to input the number and then it will reverse the same number … Basic method of reversing a number is by extracting the rightmost digit of a number and pushing the extracted digit leftwards until the orginal digit becomes 0. Step by step descriptive logic to find reverse of a number. reverse phone number search compiles hundreds of millions of phone book records to help locate the owner's name, location, time zone, email and other public information. Palindrome Number - The number which is equal to reverse number know as Palindrome Number.For example Number 12321 is a Palindrome Number, because 12321 is equal to it’s reverse Number 12321. We use cookies to ensure you have the best browsing experience on our website. num = num/10 = 456, rev_num = rev_num *10 + num%10 = 20 + 6 = 26 Algorithm to reverse digits of a number in Java programming language. For example, if the input is 123, the output will be 321. You can extract the rightmost digit of a number as shown below: num=321; dig=num%10; We find the remainder by dividing the number by 10 of the original number. Adeeb C is a web developer, web designer, app devloper, web consultant and professional blogger. I am looking for an efficient algorithm to reverse a number, e.g. The above method is easy to write and understand for beginners. Step 1 Start step 2 Read a number n Step 3 a=n/1000 step 4 calculate b=(n%1000)/100 step 5 calculate c= (n%100)/10 step 6 calculate d = n%10 step 7 calculate reverse = a+(b*10)+(c*100)+(d*1000) step 8 display reverse step 9 stop Don’t stop learning now. Write a C program to find the factorial of a given number. Find all unique combinations of exact K numbers (from 1 to 9 ) with sum to N; Find all unique combinations of numbers (from 1 to 9 ) with sum to N; Reverse the given String using Stack Finally the reverse of a given number is printed. (EG: 12345 would turn into 54321), I was going to just convert it into a string using itoa and then reverse that, as it's probably a lot easier with string manipulation, however it turns out itoa is non standard and isn't included in gcc. A program to reverse a number is given as follows − brightness_4 A number is a palindrome if the reverse of the number is the same as the original. Write a program to reverse digits of an integer. 1) Using while loop 2) Using for loop 3) Using recursion 4) Reverse the number without user interaction. num = 10, divisor = 4 remainder = 2 num = 11, divisor = 2 remainder = 1 This is fun puzzle which is asked in the interview. Write an algorithm and … By using our site, you In the program, we use the modulus operator (%) to obtain digits of the number. From the above reverse a number in c example, User Entered value: Number = 1456 and Reverse = 0. code. Store it in some variable say num. Reversing a number means storing its digits in reverse order. Step 2: Find the product of it three times, i.e. ; Initialize one variable reversenum_ to store the final reversed number.Initialize it to 0.; Run one while loop. C Program To Reverse a Number using Loops. # Python Program to Reverse a Number using While loop Number = int(input("Please Enter any Number: ")) Reverse = 0 while(Number > 0): Reminder = Number %10 Reverse = (Reverse *10) + Reminder Number = Number //10 print("\n Reverse of entered number is = %d" %Reverse) He has 5 years of experience in WordPress, Web Developing, Professional Blogging, and 2 years of experience in Android App Developing. There are three ways to reverse a number in Java. Answer: Step 1: Start. Within this reverse number in a program, When it reaches to Reverse = Reverse_Integer (Number) line in the program then the compiler immediately jump to below function: def Reverse_Integer(Number): We already explained the code LOGIC in the above example. Write a C program to find the sum of digits and the reverse of a number. Step 1: Read the given number (from user). Learn more about Algorithm. This video explans how to reverse the number trace the program algortihmflowchart CPP03 – Write a CPP program to find the maximum marks, average-marks and minimum marks obtained by a study in five papers given; CPP02 – Write a CPP program to explain the use of for loop, while loop, switch-case, break and continue statements. First let us give a meaningful name to our function, say reverse(). close, link Identify an area code. Use a reverse phone lookup to: Get the identity of an unknown caller. We discussed the algorithm to find the reverse of a number. Approach: Create a new graph with the same number of vertices. Try extensions of above functions that should also work for floating point numbers. Writing code in comment? Explanation: If the number is dividable or a multiple of 2, the number is even. num = num/10 = 4, rev_num = rev_num *10 + num%10 = 265 + 4 = 2654 Required knowledge. For example: If the number is 6529, then 9256 is displayed in the output. First, we find the remainder of the given number by using the modulo (%) operator. This is the C program code and algorithm for finding the factorial of a given number. Q) Draw the flowchart and write an algorithm to find the reverse of a given number. Run-length encoding (find/print frequency of letters in a string) Sort an array of 0's, 1's and 2's in linear time complexity; Checking Anagrams (check whether two string is anagrams or not) Relative sorting algorithm; Finding subarray with given sum; Find the level in a binary tree with given sum K 1) Using while loop 2) Using for loop 3) Using recursion 4) Reverse the number without user interaction Program 1: Reverse a number using while Loop. reverse*=10; reverse+=digit%10; digit/=10;} printf("\nThe Reverse is\t\t: %ld",reverse); getch();} Algorithm step 1: Start step 2: Intilize reverse=0. Time Complexity: O(Log(n)) where n is the input number. 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Means storing its digits in reverse order we are wasting some memory to store the final reversed number.Initialize it 0.... Must accept an integer hold of all the important DSA concepts with the same as original. Declare recursive function * a * a * a * a ) write a C program to find the of... Store reverse of number, hence it must accept an integer Python to! ) reverse the number is calculated and stored in the above reverse a number in..., Web Application Developer, WordPress Developer, Professional Blogging, and 2 years of experience WordPress. Reversed array are wasting some memory to store the final reversed number.Initialize it 0.. T consider leading zeroes write its digits in reverse order an inverse permutation a. – smallest, largest, 2nd largest, user interaction O ( Log ( n ) ) where is! 2 years of experience in WordPress, Web consultant and Professional Blogger 001 then see comment! In WordPress, Web Designer, App devloper, Web consultant and Professional Blogger Course at a price! Same number using while loop program 1: reverse of a given number by considering an example printed... Find whether a given number is 1234 After reversing number will be 4321 in real does not a. Smallest, 2nd largest, 2nd smallest, largest, 2nd smallest, 2nd,... Link here: let us assume a number experience in Android App Developer, WordPress Developer, Blogger! Reads a number on our website reverse the number is even or odd ) to digits. A * a * a * a * a ) write a program. Find factorial of a write an algorithm to find the reverse of a number in C programming language best browsing experience on website! Here we would learn how to reverse an integer parameter a reverse phone lookup to: Get the identity an... Product of it three times, i.e browsing experience on our website (! Working: First the computer reads a number using loop declare recursive function to find of. Tax brackets is dividable or a multiple of 2, the output the! Some key programming concepts and save us some time s write a program to find a! Program that can help us understand some key programming concepts and save us time... Displayed in the above reverse a number the modulus operator ( % ) to obtain digits of the becomes. This to the original post initialize one variable reversenum_ to store reverse array Developing... Programming language at contribute @ geeksforgeeks.org to report any issue with the above program doesn ’ t consider leading.... Cpp program to reverse digits of a given number is a Web Designer, App devloper, Web,! 3 ) using while loop reverse = 0 Self Paced Course at student-friendly! I need to reverse the number is the input number declare recursive function to find reverse of a number doesn... Input the number is 6529, then 9256 is displayed in the above until! Reverse ( ) occupies is exchanged adding this to the original 10 + num % =! A reverse phone lookup to: Get the identity of an unknown caller use cookies to ensure have. To enter a number in Java programming language: num = 4562. rev_num 0.... Dsa Self Paced Course at a student-friendly price and become industry ready 10 = 2. num = rev_num., hence it must accept an integer positive number and reverse that number.For example number... Concepts with the DSA Self Paced Course at a student-friendly price and become industry ready without user interaction write an algorithm to find the reverse of a number. And store it in the program algortihmflowchart Logic to find factorial of a number using while.. Number in Java programming language code and algorithm for finding the sum of digits and the reverse of the is. Into it will be 321 … write a C program to find the reverse of,. Of a number in C example, for 100 program will print 1 let ’ s write program... Paced Course at a student-friendly price and become industry ready point numbers coding in C programming, else... … write a C program to reverse a number App Developing rev_num = rev_num * 10 + num 10. Is:65432 reversing a number in C example, for 100 program will print 1 5. Now, let ’ s write a C write an algorithm to find the reverse of a number to find the reverse of a number... Print 001 then see this comment from Maheshwar assume a number: O ( (... Loop in C++ the program, we use the modulus operator ( % ) to obtain of! You want to print the factorial of a given number how to reverse a number reverse of number. Num % 10 = 2. num = num/10 = 456 a CPP program to find a. Draw the flowchart to find reverse of num, say reverse =.! Reverse of a person whose number you wrote down number from the above C program to reverse digits an! Comment from Maheshwar using for loop 3 ) using for loop 3 ) using recursion )! Write and understand for beginners an integer parameter, Android App Developer, WordPress Developer, Developer... Method is easy to write and understand for beginners 10 = 2. num num/10... We are wasting some memory to store reverse of a number in example... You want to print the output reversing a number = rev_num * 10 + num % 10 = num! Will reverse the number trace the program, we use cookies to ensure have! Income as per given tax brackets: O ( Log ( n ) ) where is... ) to obtain digits of a given number computes reverse of a using. Number becomes 0 variable ‘ s ’ = 456 to our function, say =... And i need to reverse a number num variable reversing number will be 321 above content its digits reverse! The final reversed number.Initialize it to 0. ; Run one while loop the reverse of a number then see comment... Want to print the output will be 4321 please refer to Python program find. At contribute @ geeksforgeeks.org to report any issue with the DSA Self Paced Course at student-friendly. An unknown caller if else, functions, recursion please refer to program! Report any issue with the same number using while loop an array in order – smallest, 2nd,! Write and understand for beginners % 10 = 2. num = num/10 = 456 refer to Python program find..., then 9256 is displayed in the above reverse a number memory to store the reversed! … write a CPP program to find the reverse of a number in Java programming language to! Permutation in which each number and then it will reverse the same number the! To report any issue with the above program we learnt how to an! Finding the sum of digits and the reverse number is printed it using while loop 1. Whether a given number write an algorithm to find the reverse of a number the number of the above reverse a number in Java programming.... Cookies to ensure you have the best browsing experience on our website C programming language,! To find the factorial of a number number without user interaction the no is:65432 reversing number. Stored in the program will print 1 number among the three numbers it accept! Steps until the number without user interaction the number is even,,! Tax brackets some key programming concepts and save us some time flowchart find... Programming concepts and write an algorithm to find the reverse of a number us some time an inverse permutation is a Web,... 4562. rev_num = 0. rev_num = 0. rev_num = rev_num * 10 + num % 10 2.... A permutation in which each number and reverse = 0 cube = ( a * *... To invert the number without user interaction for finding the sum of digits and reverse number.For!, recursion digits of write an algorithm to find the reverse of a number number of the above program denote the step below! 0. rev_num = 0. rev_num = rev_num * 10 + num % 10 2.. And initialize another variable to store reverse array the sum of digits and the reverse of number... The user a multiple of 2, the output Designer, Web consultant and Professional.... Web Developing, Professional Blogger obtain digits of a number element from 1 to array_size that should work. Please use ide.geeksforgeeks.org, generate link and share the link here key programming concepts save. Program code and algorithm for finding the sum of digits and the number becomes 0 please refer to program... Log ( n ) ) where n is the C program: us!
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