- If the string is a one-character Palindrome, then it isn’t possible to do so since every one-character string is a Palindrome. Then, we can scan the first half of the Palindrome to see if it is all ‘a’. If it is, then we change the last character to ‘b’. Otherwise, we change the first non ‘a’ character to ‘a’.
- COBOL - String Handling - String handling statements in COBOL are used to do multiple functional operations on strings. Following are the string handling statements −. JCL to execute the above COBOL program. //SAMPLE JOB(TESTJCL,XXXXXX),CLASS = A,MSGCLASS = C //STEP1 EXEC PGM = HELLO.
Python Program to Check a Given String is Palindrome or not Example 1 This python program allows the user to enter a string. Next, we used the If statement to check whether the given string is equal to the reverse of that string or not. If it is True, Palindrome string; otherwise, not a palindrome string in Python.
Cobol Find String In String
HowToDoInJavaLearn to check if a given string is palindrome string with simple java programs using stack, queue or simple loops. In simplest words, a string is palindrome if it is equal to it’s reverse string.
A palindrome is a word, phrase, number, or other sequence of units that may be read the same way in either direction, generally if used comma, separators or other word dividers are ignored.
1. Algorithm
1.1. First approach
To check palindrome, we can pick the characters (one by one) from start and end of string and start comparing to each other.
- Pick first character and last character of string and compare. If both matches – continue. Else string is not palindrome.
- Pick second character from start and last, compare both. If both matches – continue. Else string is not palindrome.
- Continue above comparisons till both characters to compare are same or consecutive to each other.
1.2. Second approach
Rather than comparing chars from start and end, we can also find the reverse string of the given string and compare both strings. If both strings are same, they are palindrome.
- Get character array from given string
- Build a string by iterating the array from end to beginning index
- Optionally – remove comma, separators or other word dividers from both strings
- Compare both strings
In this tutorial, we will see the examples of both approaches.
2. Check palindrome using reverse comparison
This method uses the first approach given above.
3. Check palindrome using StringBuilder.reverse()
StringBuilder.reverse()
method is shortest way to reverse a string using library functions.4. Check palindrome string using java.util.Stack
Using stack’s
push()
and pop()
methods, we can build a reverse string for a given string. Then we compare both strings.5. Check palindrome string using java.util.Queue
Using Queue’s
add()
and remove()
methods, we can build a reverse string for a given string. Then we compare both strings.6. Check palindrome string using loops
This is simplest approach which simply iterated the char array backwards and creates the string by appending chars to produce reverse string.
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