C Program to Check Whether a Number is Palindrome or Not

C Program to Check Whether a Number is Palindrome or Not

C program to check whether a number is palindrome or not; Through this tutorial, we will learn how to check whether a number is palindrome or not in the c program using for loop, while loop, recursion and function.

Algorithm To Check A Number Is Palindrome Or Not

Use the following steps to write a program to check whether a number is palindrome or not; as follows:

  • Take the number as input from the user
  • Reverse a given number.
  • Compare the original number with the reverse value.
  • If they matched, then it is a palindrome number. Otherwise, it is not a palindrome number in C programming.

Programs To Check A Number Is Palindrome Or Not in C

  • C Program To Check A Number Is Palindrome Or Not using For Loop
  • C Program To Check A Number Is Palindrome Or Not using While Loop
  • C Program To Check A Number Is Palindrome Or Not using Recursion
  • C Program To Check A Number Is Palindrome Or Not using Function

C Program To Check A Number Is Palindrome Or Not using For Loop

#include<stdio.h>

void main()
{
    int i,n,r,s=0;
     
    printf("\n Enter Integer Number:");
    scanf("%d",&n);
     
    //LOOP TO FIND REVERSE OF A NUMBER
    for(i=n;i>0; )
    {
        r=i%10;
        s=s*10+r;
        i=i/10;
    }
     
    /* CHECKING IF THE NUMBER ENTERED AND THE REVERSE NUMBER IS EQUAL OR NOT */
    if(s==n)
    {
        printf("\n %d is a Palindrome Number",n);
    }
    else
    {
        printf("\n %d is not a Palindrome Number",n);
    }
    return 0;
}

The output of the above c program; as follows:

Enter Integer Number:312
312 is not a Palindrome Number

C Program To Check A Number Is Palindrome Or Not using While Loop

/* C program to check whether a number is palindrome or not */

#include <stdio.h>

int main()
{
    int number, revNumber = 0, rem = 0, tempNumber;

    printf("Enter an integer number:- ");
    scanf("%d", &number);

    tempNumber = number;

    while (tempNumber != 0) {
        rem = tempNumber % 10;
        revNumber = revNumber * 10 + rem;
        tempNumber /= 10;
    }

    /* checking if number is equal to reverse number */
    if (revNumber == number)
        printf("%d is a palindrome.", number);
    else
        printf("%d is not a palindrome.", number);

    return 0;
}

The output of the above c program; as follows:

Enter an integer number:- 11
11 is a palindrome.

C Program To Check A Number Is Palindrome Or Not using Recursion

/**
 * C program to check palindrome number using recursion
 */
 
#include <stdio.h>
#include <math.h>


/* Function declarations */ 
int reverse(int num);
int isPalindrome(int num);



int main()
{
    int num;
    
    /* Input any number from user */
    printf("Enter any number: ");
    scanf("%d", &num);
    
    if(isPalindrome(num) == 1)
    {
        printf("%d is palindrome number.\n", num);
    }
    else
    {
        printf("%d is NOT palindrome number.\n", num);
    }
    
    return 0;
}



/**
 * Function to check whether a number is palindrome or not.
 * This function returns 1 if the number is palindrome otherwise 0.
 */
int isPalindrome(int num)
{
    /* 
     * Check if the given number is equal to 
     * its reverse.
     */
    if(num == reverse(num))
    {
        return 1;
    }
    
    return 0;
}


/**
 * Recursive function to find reverse of any number
 */
int reverse(int num)
{
    /* Find number of digits in num */
    int digit = (int)log10(num);
    
    /* Recursion base condition */
    if(num == 0)
        return 0;

    return ((num%10 * pow(10, digit)) + reverse(num/10));
}

The output of the above c program; as follows:

Enter an integer number:- 121
121 is a palindrome.

C Program To Check A Number Is Palindrome Or Not using Function

/* C program to check whether a number is palindrome or not */

#include <stdio.h>

/*function to check Palindrome Number*/
int isPalindrome(int num)
{
    int tempNumber = num;
    int dig, revNumber;

    /*getting reverse number*/
    revNumber = 0;
    while (num > 0) {
        dig = num % 10;
        revNumber = (revNumber * 10) + dig;
        num /= 10;
    }

    if (revNumber == tempNumber)
        return 1; /*Palindrome Number*/
    else
        return 0; /*Not a Palindrome Number*/
}

int main()
{
    int number;

    printf("Enter an integer number:- ");
    scanf("%d", &number);

    if (isPalindrome(number))
        printf("%d is a palindrome.", number);
    else
        printf("%d is not a palindrome.", number);

    return 0;
}

The output of the above c program; as follows:

Enter an integer number:- 121
121 is a palindrome.

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AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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