Question

write a program to read a number and find the sum of the individual digit, reverse and also Check whether it is a palindrome or not . it is a c language
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Answer 1

Explanation:

Reverse an Integer

#include <stdio.h>

int main() {

int n, rev = 0, remainder;

printf("Enter an integer: ");

scanf("%d", &n);

while (n != 0) {

remainder = n % 10;

rev = rev * 10 + remainder;

n /= 10;

}

printf("Reversed number = %d", rev);

return 0;

}

Output

Enter an integer: 2345

Reversed number = 5432

This program takes an integer input from the user. Then the while loop is used until n != 0 is false (0).

In each iteration of the loop, the remainder when n is divided by 10 is calculated and the value of n is reduced by 10 times.

Inside the loop, the reversed number is computed using:

rev = rev*10 + remainder;

Answer 2

C program to execute the given task is as follows:

#include <stdio.h>

#include <math.h>

int getLength(int n) {

   int copyOfn = n;

   int l = 0;

   while(copyOfn > 0) {

       ++l;

       copyOfn /= 10;

   }

   return l;

}

int main() {

   int n;

   scanf("%d", &n);

   

   int l = getLength(n);

   

   int copyOfn = n;

   int sumOfDigits = 0;

   int revOfn = 0;

   int d;

   for(int i = (l -1); i >= 0; i--) {

       d = copyOfn %10;

       

       sumOfDigits += d;

       revOfn += d * pow(10, i);

       

       copyOfn /= 10;

   }

   

   printf("Sum of the digits = %d\n", sumOfDigits);

   

   printf("Reverse of the no.= %d\n", revOfn);

   if(n == revOfn)

   printf("Palindrome number");

   else

   printf("Not a Palindrome number");

   return 0;

}

• In the above code, first we read the number using scanf.
• Then we calculated the length of the number inputted by the user.
• Then we found the sum of the digits of the number and the reverse of it using for loop.
• Finally, we compared the number and the reverse of it, to check for palindrome and printed the data accordingly.

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