Palindrome program using pointers and string functions
Posted by mark123
Last Updated: April 19, 2015
  4553

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void checkPal(char*);
int length(char *);

int main()
{
	char response[35];
	int  result2;
	char *res;
	res = &response[0];
	
	printf("Please enter a string to test if it is a palindrome:");
	gets(response);
     checkPal(res);

	
	system("pause");
	return 0;	
}
int length(char *string)
{
      int count = 0;
      while( *(string + count) != '\0')
      count++;
      
      return count;	
}
void checkPal(char * string) //function will reverse string accepted then perform comparison to see if string is Palindrome.
{
   int len, c, result, i;
   char *begin, *end, temp;
   char string2[50];
   len = length(string);
   begin  = string;
   end    = string;
   i=0;
   strncpy(string2,string,len);
   string2[len] =  '\0';
   for (c = 0; c < len - 1; c++)
      end++;
 
   for (c = 0; c < len/2; c++)
   {        
      temp   = *end;
      *end   = *begin;
      *begin = temp;
      begin++;
      end--;
   }
   
 
   result = strcmp(string2,string);
   
   if(result == 0)
   {
   	
   	printf("Palindrome Found: %s %s",string2,string);
   	
   } 
   else
   {
   	
   	printf("The string entered was not a Palindrome: %s %s",string,string2);
   	
   }
   
}