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 how to write a C Program for Palindrome Numbers from 1 to 1000.
Palindrome in C
Any number could be Palindrome in C if it remained the same when we reversed it. For example, 191 is a palindrome number because this number remains the same after reversing the number.
The following steps are the standard procedure to check for the Palindrome Number in C Programming
- Please enter any number to check for Palindrome in C.
- Reverse a given number
- Compare the original given value with the reverse value.
- If they matched correctly, then it is a Palindrome number. Otherwise, it is not a 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 checks 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
ANALYSIS
In this C palindrome program, We assign the original value to the Temp variable. It helps to protect our original value and perform the manipulation on the Temp variable.
Next, the While loop Condition will make sure that, the given number is greater than 0
User Entered value: Number = 1331 and Reverse = 0
Temp = Number
It means, Temp = 1331
First Iteration
Reminder = Temp %10
Reminder = 1331%10 = 1
Reverse = Reverse *10 + Reminder
Reverse = 0 * 10 + 1 = 0 + 1 => 1
Temp = Temp /10 => 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 = 133 % 10 = 3
Reverse = 1 * 10 + 3 = 10 + 3 => 13
Temp = Temp /10 = 133 /10 => 13
Third Iteration: Temp = 13 and Reverse = 13
Reminder = Temp %10 = 13%10 = 3
Reverse = 13 * 10 + 3
Reverse = 130 + 3 => 133
Temp = 13/10 = 1
Fourth Iteration: Temp = 1 and Reverse = 133
Reminder = 1 %10 = 1
Reverse = 133 * 10 + 1
Reverse = 1330 + 1 = 1331
Temp = 1/10
Temp = 0
Here, Number = 0. It means, the while loop fails
if ( Number == Reverse ) – condition will check whether the user enter number is exactly equal to Reverse number or not. If condition is True, it is a Palindrome Number. Otherwise, it’s not a Palindrome number.
if ( Number == Reverse ) means if(1331 ==1331) – TRUE, Palindrome
C Palindrome using For Loop
This program for palindrome in c check whether a 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
We replaced the While loop of first palindrome example with For loop. For further reference, please refer to For Loop in C Programming
Palindrome in C Using Functions
This program for Palindrome in c check a 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
ANALYSIS
Within this program, when the compiler reaches to Reverse_Integer (Number) line in the main() program then the compiler will immediately jump to below function:
int Reverse_Integer (int Number)
We already explained the LOGIC above example. Please refer While Loop Analysis section.
The last line of this palindrome program ends with a return Reverse statement.
C Palindrome program using Recursion
This program for Palindrome in c allows the user to enter any positive integer. Next, it checks the number is Palindrome Number using the 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
ANALYSIS
Within this Palindrome in c program, when the compiler reaches to Reverse_Integer (Number) line in the 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 the palindrome program, after completing the first line, it will terminate. For example, Number = 1331 then the output will be 1
Let’s see the If condition
if (Number > 0) – checks the number is greater than 0 or not. For Recursive functions, it is essential to place a condition before using the function recursively. Otherwise, the program will end up in infinite executions (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 finds 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
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 restrict the compiler to repeat between Minimum & Maximum Variables. I mean, iteration starts at Minimum and ends at the Maximum variable.
if(Number==Reverse) -– condition will checks the iteration number is accurately equal to the Reverse number. If it’s true, it is a Palindrome else the given number is not Palindrome number.
