C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast


What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop


What is Function C User Defined Functions C Recursion C Passing Parameters


Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register


What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings


What is String C String Functions


What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer


What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def


What is Union


What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Palindrome or Not

What is Palindrome Number?

A palindrome number is a number that remains the same when its digits are reversed. For Example : 11 is a palindrome number

Palindrome number or not


Here is some palindrome numbers for reference.

Number Palindrome or Not
11 is a palindrome
101 is a palindrome
1001 is a palindrome
10001 is a palindrome

C Program - Palindrome

Let's write a c program to check whether user entered number is a palindrome or not.

#include <stdio.h>
int main()
int a, b, c, num;
printf("Enter a number : ");
a = num;
b = 0;
while(num > 0)
c = num % 10;
b = (b * 10) + c;
num = num / 10;
if(a == b)
printf("\n%d is a Palindrome number", a);
printf("\n%d is not a Palindrome number", a);
return 0;
Enter a number : 1001
1001 is a Palindrome number


In the above program, we parse the user entered number by 10, so that remainder will be last number which is appended to a dummy variable b. Finally, variable b is compared to the user entered number to check whether they are equal, if so the number is said to be palindrome number else it's not a palindrome number.

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