Write a C program to input number from user and check number is palindrome or not using loop. How to check whether a number is palindrome or not using loop in C programming. Logic to check palindrome number in C programming.
Example
Input
Input any number: 121
Output
121 is palindrome
Required knowledge
Basic C programming, If else, While loop
What is Palindrome number?
Palindrome number is such number which when reversed is equal to the original number. For example: 121, 12321, 1001 etc.
Logic to check palindrome number
Step by step descriptive logic to check palindrome number.
- Input a number from user. Store it in some variable say num.
- Find reverse of the given number. Store it in some variable say reverse.
- Compare num with reverse. If both are same then the number is palindrome otherwise not.
Also learn – Program to check palindrome string.
Program to check palindrome number
/**
* C program to check whether a number is palindrome or not
*/
#include <stdio.h>
int main()
{
int n, num, rev = 0;
/* Input a number from user */
printf("Enter any number to check palindrome: ");
scanf("%d", &n);
/* Copy original value to 'num' to 'n'*/
num = n;
/* Find reverse of n and store in rev */
while(n != 0)
{
rev = (rev * 10) + (n % 10);
n /= 10;
}
/* Check if reverse is equal to 'num' or not */
if(rev == num)
{
printf("%d is palindrome.", num);
}
else
{
printf("%d is not palindrome.", num);
}
return 0;
}Move a step forward and learn this program using recursive approach.
Learn more – Program to check palindrome number using recursion.
Output
Enter any number to check palindrome: 121 121 is palindrome.
Happy coding 😉