Skip to content

pc011.c

Problem Statement

Write a C program that takes two positive integers, L (Lower Bound) and U (Upper Bound), as input from the user. The program must find and print the count of all numbers between L and U (inclusive) that are also a Palindrome Number.

Metadata

Property Detail
Author Amit Dutta amitdutta4255@gmail.com
Date 12 Dec 2025
License MIT License (See the LICENSE file for details)
Difficulty Beginner (index: 3 / 10)

Concepts

Beta Feature

This concept detection system is still in beta and may occasionally show incorrect or incomplete results.

  • Recursion
  • Pointers
  • Iteration

Actions

Raw View on GitHub

You can print or save this file by opening Raw and using your browser.

Source Code

#include <stdio.h>
#define true 1
#define false 0

int isPalindrome(int num)
{
    int temp = num, numRev = 0;
    while (temp > 0)
    {
        numRev = (numRev * 10) + (temp % 10);
        temp /= 10;
    }
    if (num == numRev)
        return true;
    else
        return false;
}

int main()
{
    int uBound, lBound, num, palindromeCount = 0;
    printf("Enter the Lower Bound and Upper Bound : ");
    if (scanf("%d %d", &lBound, &uBound) != 2)
    {
        printf("\nOnly Integer values are allowed.");
        return 1;
    }
    if (lBound < 0 || uBound < 0 || lBound > uBound)
    {
        printf("\nPlease enter appropriate inforamtion.");
        return 1;
    }
    printf("Palindrome Numbers from %d to %d :", lBound, uBound);
    for (num = lBound; num <= uBound; num++)
    {
        if (isPalindrome(num))
        {
            printf("  %d", num);
            palindromeCount++;
        }
    }
    printf("\nTotal Palindrome number found inside the range (%d to %d) : %d", lBound, uBound, palindromeCount);
    return 0;
}

Explanation

Explain with AI

Copy the prompt below and paste it into any AI assistant.

    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 (pc011.c):

    #include <stdio.h>
    #define true 1
    #define false 0

    int isPalindrome(int num)
    {
        int temp = num, numRev = 0;
        while (temp > 0)
        {
            numRev = (numRev * 10) + (temp % 10);
            temp /= 10;
        }
        if (num == numRev)
            return true;
        else
            return false;
    }

    int main()
    {
        int uBound, lBound, num, palindromeCount = 0;
        printf("Enter the Lower Bound and Upper Bound : ");
        if (scanf("%d %d", &lBound, &uBound) != 2)
        {
            printf("\nOnly Integer values are allowed.");
            return 1;
        }
        if (lBound < 0 || uBound < 0 || lBound > uBound)
        {
            printf("\nPlease enter appropriate inforamtion.");
            return 1;
        }
        printf("Palindrome Numbers from %d to %d :", lBound, uBound);
        for (num = lBound; num <= uBound; num++)
        {
            if (isPalindrome(num))
            {
                printf("  %d", num);
                palindromeCount++;
            }
        }
        printf("\nTotal Palindrome number found inside the range (%d to %d) : %d", lBound, uBound, palindromeCount);
        return 0;
    }