C program to check if a number is a palindrome

Comprehensive Collection of C Programming Examples

In this example, you will learn how to check if the number entered by the user is a palindrome.

To understand this example, you should know the followingC programmingTopic:

• C programming operators

• C if ... else statements

• C while and do ... while loops

If the reverse of the number is equal to the original number, then the integer is a palindrome.

Check palindrome program

#include <stdio.h>
int main() {
　　　　int n, reversedN = 0, remainder, originalN;
　　　　printf("Enter an integer: ");
　　　　scanf("%d", &n);
　　　　originalN = n;
　　　　//Reverse the integer and store it in reversedN.
　　　　while (n != 0) {
　　　　　　　　remainder = n %　10;
　　　　　　　　reversedN = reversedN　*　10　+　remainder;
　　　　　　　　n　/=　10;
　　　　{}
　　　　//If originalN and reversedN are equal, then the number is a palindrome.
　　　　if (originalN == reversedN)
　　　　　　　　printf("%d is a palindrome.", originalN);
　　　　else
　　　　　　　　printf("%d is not a palindrome.", originalN);
　　　　return 0;
{}

Output the result

Enter an integer:　1001
1001　It is a palindrome.

Here, the user is asked to enter an integer. The number is stored in the variable n.

Then we assign this number to another variable orignalN. Then find the reverse of n and store it in reversedN.

If originalN equals reversedN, then the number entered by the user is a palindrome,

Comprehensive Collection of C Programming Examples