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Palindrome Program in C

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In this article, we show you, How to write a Program for Palindrome in C Programming to Check Whether the Number is Palindrome or Not.

For this Palindrome in C program, we use while Loop, For Loop, Functions and Recursion. We also show you the, how to write a C Program for Palindrome Numbers from 1 to 1000.

Palindrome in C

Any number can be Palindrome in C, if it has remained the same when we reversed it. For example, 191 is a palindrome number because this number remains same even after reversing it.

The following steps will show you the common approach to check for the Palindrome Number in C programming

Steps:

  1. Please enter any number to check for palindrome in C.
  2. Reverse a given number
  3. Compare original given value with the reverse value.
  4. If they matched exactly then it is Palindrome number. Else it is not Palindrome number in C programming.

Palindrome in C using While Loop

This C program for palindrome allows the user to enter any positive integer and. Next, this program will check whether the given number is Palindrome Number or Not using the While Loop

/* Palindrome Program in C using While Loop */
#include <stdio.h>

int main()
{
   int Number, Temp, Reminder, Reverse = 0;
 
   printf("\nPlease Enter any number to Check for Palindrome\n");
   scanf("%d", &Number);
  
   //Helps to prevent altering the original value
   Temp = Number;

   while ( Temp > 0)
   {
      Reminder = Temp %10;
      Reverse = Reverse *10+ Reminder;
       Temp = Temp /10;
   }
 
   printf("Reverse of entered number is = %d\n", Reverse);

   if ( Number == Reverse )
      printf("\n%d is Palindrome Number.\n", Number);

   else
      printf("%d is not the Palindrome Number.\n", Number);
 
   return 0;
}

OUTPUT

Palindrome Program in C Using While

ANALYSIS
This C palindrome program allows the user to enter any positive integer and then, that number is assigned to variable Number.

Next, We assign the original value to the Temp variable. This will help us to preserve our original value and then do all the manipulation on Temp variable.

Next, Condition in the While loop will make sure that, the given number is greater than 0

User Entered value for this Palindrome in C example : Number = 1331 and Reverse = 0
Temp = Number
Temp = 1331

First Iteration
Reminder = Temp %10
Reminder = 1331%10 = 1

Reverse = Reverse *10 + Reminder
Reverse = 0 * 10 + 1 = 0 + 1
Reverse = 1

Temp = Temp /10
Temp = 1331 /10
Temp = 133

Second Iteration
From the first Iteration of palindrome program in c, the values of both Temp and Reverse has been changed as: Temp = 133 and Reverse = 1

Reminder = Temp % 10
Reminder = 133 % 10 = 3

Reverse = 1 * 10 + 3
Reverse = 10 + 3 => 13

Temp = Temp /10
Temp = 133 /10 => 13

Third Iteration
From the Third Iteration the values of both Temp and Reverse has been changed as: Temp = 13 and Reverse = 13

Reminder = Temp %10
Reminder = 13%10 = 3

Reverse = 13 * 10 + 3
Reverse = 130 + 3 => 133

Temp = Temp /10
Temp = 13/10 = 1

Fourth Iteration
From the Fourth Iteration of palindrome program in c, the values of both Temp and Reverse has been changed as: Temp = 1 and Reverse = 133

Reminder = Temp %10
Reminder = 1 %10 = 1

Reverse = 133 * 10 + 1
Reverse = 1330 + 1 = 1331

Temp = Temp /10 => 1/10
Temp = 0

Here Number = 0 so, the while loop condition will fail

if ( Number == Reverse ) – condition will check whether the user enter number is exactly equal to Reverse number or not. If this condition is True, then it is Palindrome else the given number is not a Palindrome number.

if ( Number == Reverse ) means if(1331 ==1331) – TRUE
Palindrome

C Palindrome using For Loop

This program for palindrome in c allows the user to enter any positive integer. Then, this program will check whether the given number is Palindrome Number or Not using the For Loop

/* Program for Palindrome in C using For Loop */
#include <stdio.h>

int main()
{
  int Number, Temp, Reminder, Reverse = 0;
 
  printf("\nPlease Enter any number to Check for Palindrome\n");
  scanf("%d", &Number);
   
  for(Temp = Number; Temp > 0; Temp =  Temp /10 )
  {
     Reminder = Temp %10;
     Reverse = Reverse *10+ Reminder;
  }
 
  printf("Reverse of entered number is = %d\n", Reverse);

  if ( Number == Reverse )
     printf("\n%d is Palindrome Number.\n", Number);

  else
     printf("%d is not the Palindrome Number.\n", Number);
 
  return 0;
}

OUTPUT

Palindrome in C using For Loop

We just replaced the While loop in the above palindrome example with the For loop. If you don’t understand the for loop then please refer For Loop article here: For Loop in C Programming

Palindrome in C Using Functions

This program for palindrome in c allows you to enter any positive integer. This program will check whether the given number is Palindrome Number or Not using Functions concept.

/* Program for Palindrome in C using Functions */
#include <stdio.h>

int Reverse_Integer (int)

int main()
{
  int Number, Reverse = 0;
 
  printf("\nPlease Enter any number to Check for Palindrome\n");
  scanf("%d", & Number);
 
  Reverse = Reverse_Integer (Number)

  printf("Reverse of entered number is = %d\n", Reverse);

  if ( Number == Reverse )
     printf("\n%d is Palindrome Number.\n", Number);
  else
     printf("%d is not the Palindrome Number.\n", Number);
 
  return 0;
}

int Reverse_Integer (int Number)
{
  int Reminder, Reverse = 0;

  for(; Number > 0; Number =  Number /10 )
   {
     Reminder = Number %10;
     Reverse = Reverse * 10 + Reminder;
   }

  return Reverse;
}

OUTPUT

Palindrome in C Using Functions


ANALYSIS
Within this program for palindrome in c programming, when the compiler reaches to Reverse_Integer (Number) line in main() program then the compiler will immediately jump to below function:

int Reverse_Integer (int Number)

We already explained LOGIC above example. Please refer C Program to Check Whether a Number is a Palindrome or Not Using While Loop Analysis section.

The last line of this palindrome program in C ends with return Reverse statement.

NOTE: If we create a function with Void then there is no need to return any value but, if we declared a function with any data type (int, float etc) then we have return something out from the function.

C Palindrome program using Recursion

This program for palindrome in c allows the user to enter any positive integer. Next, this program will check whether the given number is Palindrome Number or Not using Recursive Functions concept.

/* Program for Palindrome in C using Recursion */
#include <stdio.h>

int Reverse_Integer (int)

int main()
{
  int Number, Reverse = 0;
 
  printf("\nPlease Enter any number to Check for Palindrome\n");
  scanf("%d", & Number);
 
  Reverse = Reverse_Integer (Number)

  printf("Reverse of entered number is = %d\n", Reverse);

  if ( Number == Reverse )
     printf("\n%d is Palindrome Number.\n", Number);
  else
     printf("%d is not the Palindrome Number.\n", Number);
 
  return 0;
}

int Reverse_Integer (int Number)
{
  static Reminder, Reverse = 0;
 
  if (Number > 0)
   {
     Reminder = Number %10;
     Reverse = Reverse *10+ Reminder;
     Reverse_Integer (Number /10);
     return Reverse;
   }
  else
     return 0;
}

OUTPUT

Palindrome in C Using Recursion

ANALYSIS
Within this palindrome in c program, when the compiler reaches to Reverse_Integer (Number) line in main() program then the compiler will immediately jump to below function:

int Reverse_Integer (int Number)

In this function, Reverse_Integer (Number /10) statement will help to call the function Recursively with the updated value. If you miss this statement in palindrome program then, after completing the first line it will terminate.

For example, Number = 1331 then the output will be 1

Let’s see the If condition of the palindrome in c

if (Number > 0) will check whether the number is greater than 0 or not. For Recursive functions it is very important to place a condition before using the function recursively otherwise, we will end up in infinite execution (Same like Infinite Loop).

Please be careful :)

C Program for Palindrome Numbers between 1 and 1000

This palindrome program allows you to enter a minimum and maximum values. This program find the Palindrome Number between the Minimum and Maximum values.

#include<stdio.h>

int main()
{
  int Number,Reminder,Reverse,Temp;
  int Minimum,Maximum;

  printf("\nPlease Enter the Minimum & Maximum Values\n");
  scanf("%d %d",&Minimum, &Maximum);

  printf("Palindrome numbers Between %d and %d are:\n",Minimum, Maximum);

  for(Number=Minimum;Number<=Maximum;Number++)
   {
     Temp=Number;
     Reverse =0;
     while (Temp > 0)
      {
        Reminder =  Temp %10;
        Reverse = Reverse *10+ Reminder;
        Temp =  Temp /10;
      }
   if(Number==Reverse)
      printf("%d ",Number);
   }
 return 0;
}

OUTPUT

Palindrome Numbers in C 2

ANALYSIS
This program for Palindrome in C allows the user to enter a minimum and maximum values.

for (Number=Minimum; Number<=Maximum; Number++)

This For Loop helps the compiler to iterate between Minimum and Maximum Variables, iteration starts at the Minimum and then it will not exceed Maximum variable.

if(Number==Reverse) -– condition will check whether the iteration number is exactly equal to the Reverse number or not. If this condition is True, then it is Palindrome else the given number is not Palindrome number.

If this condition is True then, below statement will be printed

printf("%d ",Number);

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