Palindrome String solution in c++

Here is an example of a solution to check if a string is a palindrome in C++:

#include <iostream>
#include <string>

bool isPalindrome(const std::string& str) {
    int start = 0;
    int end = str.length() - 1;

    while (start < end) {
        if (str[start] != str[end]) {
            return false;
        }
        start++;
        end--;
    }

    return true;
}

int main() {
    std::string str;
    std::cout << "Enter a string: ";
    std::cin >> str;

    if (isPalindrome(str)) {
        std::cout << "The string is a palindrome." << std::endl;
    } else {
        std::cout << "The string is not a palindrome." << std::endl;
    }

    return 0;
}

Explanation:

Step 1: Include necessary libraries

#include <iostream>
#include <string>

This code snippet includes the necessary libraries for input/output operations and string manipulation in C++.

Step 2: Define the isPalindrome function

bool isPalindrome(const std::string& str) {
    int start = 0;
    int end = str.length() - 1;

    while (start < end) {
        if (str[start] != str[end]) {
            return false;
        }
        start++;
        end--;
    }

    return true;
}

This function takes a const std::string& parameter str and returns a boolean value indicating whether the string is a palindrome or not. It uses two indices, start and end, to compare characters from both ends of the string. If at any point the characters at start and end indices are not equal, it returns false. If the loop completes without finding any unequal characters, it returns true.

Step 3: Define the main function

int main() {
    std::string str;
    std::cout << "Enter a string: ";
    std::cin >> str;

    if (isPalindrome(str)) {
        std::cout << "The string is a palindrome." << std::endl;
    } else {
        std::cout << "The string is not a palindrome." << std::endl;
    }

    return 0;
}

The main function is the entry point of the program. It prompts the user to enter a string, reads the input using std::cin, and assigns it to the str variable. Then it calls the isPalindrome function to check if the entered string is a palindrome or not. Finally, it prints the appropriate message based on the result.

Step 4: Return the result

return 0;

This statement returns 0 to indicate successful execution of the program.

Note: It's important to include the necessary libraries, define the isPalindrome function, and call it from the main function to check if a string is a palindrome in C++.