C Program to Check a Number is Palindrome or Not

  • Write a c program to check whether a number is palindrome or not.
  • Write a C program to check for palindrome number.

A number is palindrome, if number remains same after reversing it's digits.
For Example
432234 is palindrome number, but 54321 is not a palindrome number.

This program first takes a number as input form user. Then, to check whether number is palindrome or not, we reverse the digits of number and then compare it with original number. If original number and it's reverse are same then number is palindrome otherwise not a palindrome.

Algorithm to check a number is palindrome or not
  1. Take a number as input from user and store it in an integer variable(Let's call it inputNumber).
  2. Reverse the digits of inputNumber, and store it in another integer variable(Let's call it reverseNumber).
  3. Compare inputNumber and reverseNumber.
  4. If both are equal then inputNumber is palindrome otherwise not a palindrome.

C program to check a number is palindrome or not

This program first takes an integer as input from user and stores it in variable 'inputNumber'. Then it copies the value of input number to variable 'temp'. Now using a while loop it reverses the digits of temp(click here to know how to reverse a number Reverse a number). We then compare the values of inputNumber and temp, If they are equal then inputNumber is palindrome otherwise not a palindrome.

/*
* C Program to check whether a number is palindrome or not
*/
#include <stdio.h>
#include <conio.h>

int main(){
    int inputNumber, reverseNumber = 0, rightDigit, temp;
    printf("Enter a number \n");
    scanf("%d", &inputNumber);
    temp = inputNumber;
    /*reverse inputNumber and store it in reverseNumber */
    while(temp != 0){
        rightDigit = temp % 10;
        reverseNumber = (reverseNumber * 10) + rightDigit;
        temp = temp/10;
    }
    
    if(reverseNumber == inputNumber){
        printf("%d is Palindrome number\n", inputNumber);
    } else {
        printf("%d is not a Palindrome number\n", inputNumber);
    }
    
    getch();
    return 0;
}
Program Output
Enter a number : 12321
12321 is Palindrome number
Enter a number : 12345
12345 is not a Palindrome number

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