Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I wrote a string palindrome checker which my instructor says is more complex than it needs to be. I've read similar threads and googled around, but I'm completely stumped as to how to get it to work with fewer steps than this And call isPal str, 0, str.
The idea is to use two indexes and move them as you don't want to use substr every time in recursion. It should be a function returning true or false, and not print a message. The parameter should be a single string object. So a recursive solution with a single parameter requires a new string object with each recursion. This has been critizised as being "horrible" - but is it really? An algorithm must be judged in relation to the domain for which it is intended.
Let's assume that this domain is the words of the English language. There is more than 1. Also, the percentage of words with equal first and last letters is very small, and therefore not even a single recursion is required in most cases. If one does want to avoid this "horror", one has three options: avoid recursion, use a second method to be called from the first or require more than one argument. The third variant has been proposed by others, requiring no less than three arguments, asking the user to provide redundant information with a rather messy call, e.
Now we have avoided the creation of string objects even in those rare cases of palindromes or "palindromoids" at the cost of one additional parameter, at least without redundant information. Learn more. Asked 6 years, 8 months ago. Active 4 years, 5 months ago. Viewed 35k times. You should just split string in halfs and compare them? Use two indexes together, you don't want to use.
This is caused by the last recursive call, where the value of last and end will always be same i. Learn more. Test for Palindrome using a recursive function in C Ask Question. Asked 7 years, 5 months ago. Active 3 years, 6 months ago. Viewed 24k times. Shail Shail 9 9 gold badges 17 17 silver badges 34 34 bronze badges.
Step through the code in a debugger, line by line. And use a string that you know is a palindrome, preferably a short one so it's quicker. I fixed that, still I'm getting the same output. What happens when you debug the program? Active Oldest Votes. V-rund Puro-hit 5, 8 8 gold badges 26 26 silver badges 47 47 bronze badges. Single Entity 2, 3 3 gold badges 24 24 silver badges 54 54 bronze badges.
Kartik Thakral Kartik Thakral 1 1 1 bronze badge. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Ben answers his first question on Stack Overflow. The Overflow Bugs vs. Featured on Meta. Responding to the Lavender Letter and commitments moving forward.
A string is nothing but an array of characters. The value of a string is determined by the terminating character. Its value is considered to be 0.
Compare the element at s[i] with the element at s[n-i-1]. If both are equal then increase the c value. Calculate the string length n using strlen s. If the element at s[i] is equal to the element at s[n-i-1] then increase the c value and i value. If the returned value is 0 then print the string is not a palindrome. Using String Library Function Read the string s using gets s1 and store into the variable s1. Using library functions we are comparing the two strings.
The string library functions are available at string. Otherwise, print the string is not a palindrome. Using Recursion. Using String Library Function. Java Tutor. Copyrighted Protected.A string is palindromeif string remains same after reversing sequence of it's character. For example, "tenet" is a palindrome string whereas "mango" is not a palindrome string. We can check whether a string is palindrome or not using recursion by breaking this problem into a smaller problem. In below program, we first take a string as input from user and stores it in a character array named 'inputString'.
Here, we are using a user defined recursive function named "isPalindrome" which checks whether a substring of string "inputString" from index leftIndex to rightIndex is palindrome or not. We call this function inside main function at line number 17 by passing 0 and strlen inputString -1 as leftIndex and rightIndex of inputString to check whether inputString is palindrome or not. Suppose out input string is "madam". To check whether input string is palindrome or not we will call isPalindrome function with following parameters isPalindrome inputString, 0, 4.
As first and last character or input string are same, isPalindrome will recursively call itself to check whether the sub-string excluding the first and last character "ada" is palindrome or not and so on. Function isPalindrome will repeat this process unless length of sub-string is greater than one or first and last characters are unequal.
Toggle navigation Home. C Program for Palindrome Check using Recursion. Write a C program to check if a string is palindrome or not using recursion.
Algorithm to check palindrome string using recursion. Let inputString is a string character array of length N and leftIndex and rightIndex are two integer variable. If not equalthen inputString is not a palindrome string. Newer Post Older Post Home. C program to check string is palindrome. C program to find sum of array elements using recursion.
C program to reverse a string using recursion. C program to find factorial of a number using recursion. C program to reverse a number. C program to find power of a number using recursion.Given a string, write a recursive function that check if the given string is palindrome, else not palindrome. We have discussed an iterative function here.
Recursive Palindrome check
This article is contributed by Sahil Rajput. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Attention reader! Writing code in comment? Please use ide. Examples : Input : malayalam Output : Yes Reverse of malayalam is also malayalam.
Input : max Output : No Reverse of max is not max. A recursive Python program. A recursive function that. If there is only one character. If first and last. If there are more than. An empty string is. Write "Yes". Write "No". Recommended Posts: Recursive program to check if number is palindrome or not String slicing in Python to check if a string can become empty by recursive deletion Sentence Palindrome Palindrome after removing spaces, dots.
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To win a bet with such outcome it is necessary that one of the competitors win, the game should not end in a draw. To win a bet with such outcome the second team must win or the game ends in a draw. Victory of the participant of competition taking into account the handicaps. Handicap can be positive, negative or zero. The handicaps given to the participant are added to the corresponding result shown by the participant in the competition.
Payments are made with the winning coefficient mentioned in the program. If the result is in favour of the competitor, the bets are lost. Double bet of handicap is offered (Asian handicap). Bet on victory or total taking into account the handicap, this is the multiple of 0.
C Program to Check whether the Given String is a Palindrome
In case when the Asian handicap is included in parlay or system, it is calculated with that odd which would be in case of a single bet. If both common bets are lost, the whole bet considered lost. In the line this quantity is called total for brevity.
For winning it is necessary to guess, whether it will be scored more or less than total in the line, or exactly the specified quantity. At definition of result, the game time is taken into account, according to these rules (see the point 2. At definition of individual totals only the balls kicked into the goals of the competitor are taken into account.
Two variants of betting are offered on total: by two (under or over) or by three (under, over or equal) outcomes. Also double bet of total is offered, which is a multiple of 0. The sum of each common bet is equal to the half sum of double bet. For example:Bet Sport event Double bet of total Odd Sum1 Milan - Juventus Over 2. One common bet of double total (Under 2) has won with the odd "1", and the other (Under 2. Two common bets of double total (Over 2. Two common bets of double total (Under 2.
Score of the match. The result of the first half and the whole match. It is necessary to guess both outcomes of the first half and the outcome of the whole match.
The following designation is used in the line.
On the first place is the outcome of the 1-st half, and on the second place is the outcome of the whole match. W2W1 means victory of the second team in the first half and the victory of the 1-st team in the whole match. Betting on the potency of each period (quarter, game, set, inning).
It is necessary to guess which of the periods (quarters, games, sets, innings) appears to be more productive or which of them will have the same productivity.
The way of scoring (from free kick, from penalty kick, from header, from kick, own goal).