C++ Program to Check Palindrome Number

In this post, we will learn how to check palindrome numbers using C++ Programming language.

A number is said to be palindrome if its reverse is equal to itself. For example: 101, 141, and 12321 etc.

If Original number = reverse, then the number is a palindrome number. We will check this with the help of while loop and if. . .else statement.

So, without further ado, let’s begin this tutorial. 

Contents

C++ Program to Check Palindrome Number

// C++ Program to Check Palindrome Number
#include <iostream>
using namespace std;

int main(){
    int num, rev = 0, temp;
    
    // Asking for input
    cout << "Enter a number: ";
    cin >> num;
    
    temp = num;
    
    // Reverse the number
    while(temp > 0){
        rev = rev * 10 + temp % 10;
        temp = temp / 10;
    }
    
    // Checking palindrome
    if (num == rev){
        cout << num << " is a palindrome number.";
    }
    else{
        cout << num << " is not a palindrome number.";
    }
    return 0;
}

Output

Enter a number: 12321
12321 is a palindrome number.

How Does This Program Work ?

    int num, rev = 0, temp;

In this program, we have declared three int data type variables named num, rev and temp.

    // Asking for input
    cout << "Enter a number: ";
    cin >> num;

Then, the user is asked to enter a number to check the palindrome.

    // Reverse the number
    while(temp > 0){
        rev = rev * 10 + temp % 10;
        temp = temp / 10;
    }

We reverse the original number with the help of a while loop.

    if (num == rev){
        cout << num << " is a palindrome number.";
    }
    else{
        cout << num << " is not a palindrome number.";
    }

Now, we check whether the reverse number is equal to the original number or not. If yes, then the entered number is a palindrome number and we display it on the screen using cout statement.

Otherwise, the program will display that the entered number is not a palindrome number.

Conclusion

I hope after going through this post, you understand how to check palindrome numbers using C++ Programming language.

If you have any problem regarding the program, feel free to contact us in the comment section. We will be delighted to assist you.

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