C++ Exercises: Check whether a given number is palindrome or not

Last update on April 12 2025 13:00:32 (U TC/GMT +8 hours)

38. Palindrome Number Check

Write a C++ program to check whether a given number is a palindrome or not.

Sample Solution:

C++ Code :

#include <iostream> // Including the input-output stream library

using namespace std; // Using the standard namespace

int main() // Main function
{
    int i, n1, r, s = 0; // Declare integer variables: i for iteration, n1 for input number, r for remainder, s for storing reversed number

    cout << "\n\n Check whether a given number is palindrome or not: \n"; // Display purpose
    cout << " -------------------------------------------------------\n"; // Display purpose
    cout << " Input a number: "; // Prompt user for input
    cin >> n1; // Input the number

    for (i = n1; i > 0; ) // Loop to reverse the number
    {
        r = i % 10; // Extract the last digit of the number
        s = s * 10 + r; // Build the reversed number by adding the extracted digit
        i = i / 10; // Remove the last digit from the number
    }

    if (s == n1) // Check if the reversed number is equal to the original number
    {
        cout << " " << n1 << " is a Palindrome Number." << endl; // If equal, display that it's a palindrome
    }
    else
    {
        cout << " " << n1 << " is not a Palindrome Number." << endl; // If not equal, display that it's not a palindrome
    }
}

Sample Output:

Check whether a given number is palindrome or not:                    
 -------------------------------------------------------               
 Input a number: 141                                                   
 141 is a Palindrome Number.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to check if a number is a palindrome by reversing its digits using a while-loop.
Write a C++ program to verify palindrome numbers by converting the number to a string and comparing reversed strings.
Write a C++ program to determine palindromicity using recursion to reverse the number digit by digit.
Write a C++ program to test for palindrome numbers with error handling for negative inputs.

C++ Code Editor:

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