Check Palindrome String in C, C++, Java & Python – Code with Explanation & Examples in Short and Simple

   

C Program

#include <stdio.h>
#include <string.h>
int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int len = strlen(str);
    int i, flag = 1;
    for(i = 0; i < len/2; i++) {
        if(str[i] != str[len-i-1]) {
            flag = 0;
            break;
        }
    }
    if(flag) printf("Palindrome String");
    else printf("Not a Palindrome String");
    return 0;
}

C Output

Input: madam
Output: Palindrome String

C++ Program

#include <iostream>
#include <string>
using namespace std;
int main() {
    string str;
    cout << "Enter a string: ";
    cin >> str;
    string rev = string(str.rbegin(), str.rend());
    if(str == rev) cout << "Palindrome String";
    else cout << "Not a Palindrome String";
    return 0;
}

C++ Output

Input: racecar
Output: Palindrome String

JAVA Program

import java.util.Scanner;
class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a string: ");
        String str = sc.next();
        String rev = new StringBuilder(str).reverse().toString();
        if(str.equals(rev)) System.out.println("Palindrome String");
        else System.out.println("Not a Palindrome String");
    }
}

JAVA Output

Input: hello
Output: Not a Palindrome String

Python Program

s = input("Enter a string: ")
if s == s[::-1]:
    print("Palindrome String")
else:
    print("Not a Palindrome String")

Python Output

Input: level
Output: Palindrome String

In-Depth Explanation

Example

A palindrome string is a string that reads the same both forwards and backwards. Traditional examples are "madam", "racecar", and "level". If you turn them back to front, the characters are in the same order as the original string. However, "hello" is not a palindrome since reversing it yields "olleh", which does not match.

Real-Life Analogy

Think of writing a word on paper and then reflecting it with a mirror on the other side. If the word reflected in this manner appears exactly like the original word, then it is a palindrome. The definition isn't just for words; even numbers, dates (such as 02-02-2020), and sequences can be palindromes.

Why It Matters

Palindrome verification is an extremely popular interview question as it checks both string manipulation and logical thinking skills. It compels you to think in terms of indexing, loops, and conditions. For example, in C we do it manually character by character, whereas in Python slicing reduces it to s == s[::-1].

Learning Insights

With this problem, newbies learn how to work with strings, calculate length, reverse strings, and utilize built-in tools like StringBuilder in Java or slicing in Python. It also illustrates how various languages provide various degrees of abstraction. C needs manual verification, while Python addresses it in a line.

Real-World Applications

Palindrome testing can be innocuous-looking but is used in cryptography, DNA sequence analysis, natural language processing, and string matching. In genetics, for instance, palindromic DNA base sequences are of biological importance. In text applications, palindrome finding finds application in amusing applications, puzzles, or even symmetric input detection in algorithms.

Interview Relevance

Firms usually pose palindrome questions since they can be readily expanded. For example, after verifying a palindrome string, you may be required to verify a palindrome sentence disregarding spaces and punctuation (such as "A man, a plan, a canal: Panama"). This develops problem-solving endurance and prompts neat, effective coding.

Knowing how to verify if a string is a palindrome is a fundamental coding skill for students and beginners who are preparing to face coding interviews. Palindrome string code in C, C++, Java, and Python are the most frequently asked problems in exams and interviews due to the fact that they enhance logic construct and string manipulation skills. Working on palindrome problems not only increases confidence in dealing with strings but also improves algorithmic thinking, hence emerging as a fundamental idea in computer science study and practical programming problems.