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pc-ip-05.c

Problem Statement

Question 5: Write a function to check whether a given string is a palindrome. Use this function to determine whether an entered string is Palindrome.

Metadata

Property Detail
Author Amit Dutta amitdutta4255@gmail.com
Date 05 Jan 2026
License MIT License (See the LICENSE file for details)
Difficulty Beginner (index: 2 / 10)

Concepts

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  • Recursion
  • Array
  • Iteration

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Source Code

#include <stdio.h>

int isPalindrome(char[]);

int main()
{
    char str[51];
    printf("Please enter the string (Max: 50 character): ");
    gets(str);
    if (isPalindrome(str))
    {
        printf("\nInput string is a palindrome string.");
    }
    else
    {
        printf("\ninput string is not a palindrome string.");
    }
    return 0;
}

int isPalindrome(char str[])
{
    int low = 0;
    int high = 0;
    while (str[high] != '\0')
    {
        high++;
    }
    high--;
    if (low == high)
    {
        return 1;
    }
    while (low < high)
    {
        if (str[low] != str[high])
        {
            return 0;
        }
        low++;
        high--;
    }
    return 1;
}

Explanation

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    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (pc-ip-05.c):

    #include <stdio.h>

    int isPalindrome(char[]);

    int main()
    {
        char str[51];
        printf("Please enter the string (Max: 50 character): ");
        gets(str);
        if (isPalindrome(str))
        {
            printf("\nInput string is a palindrome string.");
        }
        else
        {
            printf("\ninput string is not a palindrome string.");
        }
        return 0;
    }

    int isPalindrome(char str[])
    {
        int low = 0;
        int high = 0;
        while (str[high] != '\0')
        {
            high++;
        }
        high--;
        if (low == high)
        {
            return 1;
        }
        while (low < high)
        {
            if (str[low] != str[high])
            {
                return 0;
            }
            low++;
            high--;
        }
        return 1;
    }