﻿ C Program: Check whether a number is a palindrome or not - w3resource

# C Exercises: Check whether a number is a palindrome or not

## C For Loop: Exercise-38 with Solution

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

This program should prompt the user to input a number, then check if the number reads the same forwards and backwards. If the number is a palindrome, the program will display a message confirming this; otherwise, it will indicate that the number is not a palindrome.

Visual Presentation:

Sample Solution:

C Code:

``````#include <stdio.h> // Include the standard input/output header file.

void main(){
int num, r, sum = 0, t; // Declare variables for the original number, remainder, reversed number, and temporary variable.

printf("Input a number: "); // Prompt the user to input a number.
scanf("%d", &num); // Read the input from the user.

for(t = num; num != 0; num = num / 10){ // Loop to reverse the digits of the number.
r = num % 10; // Extract the last digit (remainder when divided by 10).
sum = sum * 10 + r; // Build the reversed number by adding the extracted digit.
}

if(t == sum) // Check if the original number and the reversed number are equal.
printf("%d is a palindrome number.\n", t); // Print a message if it is a palindrome.
else
printf("%d is not a palindrome number.\n", t); // Print a message if it is not a palindrome.
}
```
```

Output:

```Input a number: 121
121 is a palindrome number.
```

Flowchart:

C Programming Code Editor:

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