A program that will ask the user to give a string and then the program will check if the given string is a palindrome or not a palindrome using pointers in C programming language.

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Program Listing

#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main() {
   char str[100];
   char *begin_ptr, *end_ptr;
   int len, is_palindrome = 1;
   
     
   printf("\n\n");
   printf("\tString Palindrome Using Pointers in C\n\n");
   printf("\tEnter a string: ");
   gets(str);

   len = strlen(str);
   begin_ptr =  toupper(str);
   end_ptr = toupper(str) + len - 1;

   while (toupper(begin_ptr) < toupper(end_ptr)) {
      if (toupper(*begin_ptr) != toupper(*end_ptr)) {
         is_palindrome = 0;
         break;
      }
      begin_ptr++;
      end_ptr--;
   }
   
   printf("\n\n");
   if (is_palindrome)
      printf("\t%s is a palindrome.", str);
   else
      printf("\t%s is not a palindrome.", str);
   printf("\n\n");
   printf("\tEnd of Program\n\n");
   return 0;
}