Check the given number is palindrome number or not using c program

Code 1:
1. Wap to check a number is palindrome
2. C program to find whether a number is palindrome or not

#include<stdio.h>
int main(){
    int num,r,sum=0,temp;

    printf("Enter a number: ");
    scanf("%d",&num);

    temp=num;
    while(num){
         r=num%10;
         num=num/10;
         sum=sum*10+r;
    }
    if(temp==sum)
         printf("%d is a palindrome",temp);
    else
         printf("%d is not a palindrome",temp);

    return 0;
}

Sample output:
Enter a number: 131
131 is a palindrome

Code 2:
1. Write a c program for palindrome
2. C program to find palindrome of a number
3. Palindrome number in c language

#include<stdio.h>
int main(){
    int num,r,sum,temp;
    int min,max;

    printf("Enter the minimum range: ");
    scanf("%d",&min);

    printf("Enter the maximum range: ");
    scanf("%d",&max);

    printf("Palindrome numbers in given range are: ");
    for(num=min;num<=max;num++){
         temp=num;
         sum=0;

         while(temp){
             r=temp%10;
             temp=temp/10;
             sum=sum*10+r;
         }
         if(num==sum)
             printf("%d ",num);
    }
    return 0;
}


Sample output:
Enter the minimum range: 1
Enter the maximum range: 50
Palindrome numbers in given range are: 1 2 3 4 5 6 7 8 9 11 22 33 44

Code 3:
1. How to check if a number is a palindrome using for loop

#include<stdio.h>
int main(){
    int num,r,sum=0,temp;

    printf("Enter a number: ");
    scanf("%d",&num);

    for(temp=num;num!=0;num=num/10){
         r=num%10;
         sum=sum*10+r;
    }
    if(temp==sum)
         printf("%d is a palindrome",temp);
    else
         printf("%d is not a palindrome",temp);

    return 0;
}

Sample output:
Enter a number: 1221
1221 is a palindrome

Code 4:
1. C program to check if a number is palindrome using recursion

#include<stdio.h>

int checkPalindrome(int);
int main(){
    int num,sum;

    printf("Enter a number: ");
    scanf("%d",&num);

    sum = checkPalindrome(num);

    if(num==sum)
         printf("%d is a palindrome",num);
    else
    printf("%d is not a palindrome",num);

    return 0;
}

int checkPalindrome(int num){

    static int sum=0,r;

    if(num!=0){
         r=num%10;
         sum=sum*10+r;
         checkPalindrome(num/10);
    }

    return sum;
}

Sample output:
Enter a number: 25
25 is not a palindrome



Definition of Palindrome number or What is palindrome number?

A number is called palindrome number if it is remain same when its digits are reversed. For example 121 is palindrome number. When we will reverse its digit it will remain same number i.e. 121
Palindrome numbers examples: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191 etc. 

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12 comments:

  1. what is temp ?

    ReplyDelete
    Replies
    1. Here temp is any temporary variable to keep the intermediate value.

      Delete
  2. thanks ! :)

    ReplyDelete
  3. Shaunak Chakraborty1/28/13, 5:40 PM

    Can't understand this part:

    "
    for(temp=num;num!=0;num=num/10){
    r=num%10;
    sum=sum*10+r;
    }"

    Please elaborate. thanks in advance!

    ReplyDelete
    Replies
    1. it means that while temp is grater than zero it will run
      r=num%10 is done in order to take out the last digit because % gives remainder line if if int num=1234 and int r=1234%10
      then r=4 since the initial value of sum is zero therefore for the first time sum will be r that is 4 for the second time it will be 4*10+3 and so on at last it will be 432*10+1 that is 4321
      if you have any further problem mail me at letterdrama@gmail.com

      Delete
  4. i guess there is a mistake ..it should be
    sum= num *10 + r;

    ReplyDelete
    Replies
    1. no it must not be i have explained it in above question

      Delete
  5. program to find palindrome of 010
    without using string function
    akhilesharya09@gmail.com

    ReplyDelete
  6. thanks!!
    Visit 2pforinterview.blogspot.in if anybody want to prepare programming and puzzles for Technical interviews.

    ReplyDelete
  7. plz say program of to print palindromes from 1 to 50

    ReplyDelete
  8. write a code to determine either the number entered is a palindrome(454,6776)or not?

    ReplyDelete
  9. This is Interview question? solve thisProgram

    palindrome can't use loop function???

    ReplyDelete