C Exercises: Reads in a five-digit integer and determines whether or not it’s a palindrome

Last update on September 18 2025 12:35:04 (UTC/GMT +8 hours)

Check if a 5-digit integer is a palindrome

Write a C program that reads a five-digit integer and determines whether or not it's a palindrome.

Sample Input: 33333

Sample Solution:

C Code:

#include <stdio.h>

// Function to check if a number is a palindrome
int is_Palindrome(int);

int main()
{
int n;

    // Prompt user for input
printf("Input a five-digit number: ");

    // Read the number from user
scanf("%d", &n);

    // Check if the number is a palindrome using the function is_Palindrome
if (is_Palindrome(n))
printf("%d is a palindrome.", n);
else
printf("%d is not a palindrome.", n);

return 0;
}

// Function to check if a number is a palindrome
int is_Palindrome(int n) {
int x = n;
int reverse_num = 0;

    // Extract the digits in reverse order and reconstruct the number
reverse_num += x / 10000;
    x = x - ((x / 10000) * 10000);

reverse_num += ((x / 1000) * 10);
    x = x - ((x / 1000) * 1000);

reverse_num += ((x / 100) * 100);
    x = x - ((x / 100) * 100);

reverse_num += ((x / 10) * 1000);
    x = x - ((x / 10) * 10);

reverse_num += ((x % 10) * 10000);

    // Check if the original number is equal to the reversed number
return n == reverse_num;
}

Sample Output:

Input a five-digit number: 33333 is a palindrome.

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to check if a 5-digit integer is a palindrome without converting it to a string.
• Write a C program to verify a 5-digit number’s palindrome property using mathematical operations.
• Write a C program to determine if a 5-digit integer is a palindrome and display its reverse.
• Write a C program to check for a palindrome in a 5-digit number using an iterative loop and modulus.

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