C Exercises: Find next smallest palindrome of a given number

C Programming Mathematics: Exercise-23 with Solution

Write a C program to find next smallest palindrome of a given number.

From Wikipedia,
A palindrome is a word, number, phrase, or other sequence of characters which reads the same backward as forward, such as madam, racecar. There are also numeric palindromes, including date/time stamps using short digits 11/11/11 11:11 and long digits 02/02/2020. Sentence-length palindromes may be written when allowances are made for adjustments to capital letters, punctuation, and word dividers, such as "A man, a plan, a canal, Panama!".

Example:
Input: n = 121
Output: Next smallest palindrome of 121 is 131

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>

int nextPalindromeGenerate(int n)
    {   
       int ans=1, digit, rev_num=0, num;              
    if(n<10)
        {   
            ans=0;
			return n+1;
        }
        num=n;
        while(ans!=0)
        {   rev_num=0;digit=0;
            n=++num;

            while(n>0)       
            {
                digit=n%10;
                rev_num=rev_num*10+digit;
                n=n/10;
            }
            if(rev_num==num)   
            {
                ans=0;
				return num;
            }
            else ans=1;
        }
		return num;
    }
  int main(void)
    {          
       int n = 121;
       if (n>0);
		{	
		 printf("Next smallest palindrome of %d is %d", n, nextPalindromeGenerate(n));
		}         
		return 0;
   }

Sample Output:

Next smallest palindrome of 121 is 131

Flowchart:

C Programming Code Editor:

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