Program to check whether string is palindrome or not without using library function

Program to check whether string is palindrome or not without using library function

#include<stdio.h>

 void main()

{

            char s[20];

            int i=0, len, flag = 0;

            printf("\nEnter s1: ");

            gets(s);

            /*To find the length of the string*/

            while(s[i]!='\0')

            {

                        i++;

            }

            len = i;

            for(i=0; i<len/2; i++)

            {

                        if(s[i] != s[len-i-1])

                        {

                                    flag = 1;

                                    break;

                        }

            }

            if(flag == 0)

                        printf("\nString is palindrome.");

            else

                        printf("\nString is not palindrome.");

}

Output:

Enter s1: abcba

Strings is palindrome.