/*
 * C program to find the length of a string without using the
 * built-in function also check whether it is a palindrome
 */
#include <stdio.h>
#include <string.h>

void main()
{
    char string[25], reverse_string[25] = {'\0'};
    int i, length = 0, flag = 0;
    printf("Enter a string \n");
    gets(string);
    /*  keep going through each character of the string till its end */
    for (i = 0; string[i] != '\0'; i++)
        {
            length++;
        }
    printf("The length of the string '%s' = %d\n", string, length);
    for (i = length - 1; i >= 0 ; i--)
        {
            reverse_string[length - i - 1] = string[i];
        }
    /*  Check if the string is a Palindrome */
    for (flag = 1, i = 0; i < length ; i++)
        {
            if (reverse_string[i] != string[i])
                flag = 0;
        }
    if (flag == 1)
        printf ("%s is a palindrome \n", string);
    else
        printf("%s is not a palindrome \n", string);
}
/*
*OUTPUT:
Enter a string
how  are you
The length of the string 'how  are you' = 12
how  are you is not a palindrome

Enter a string
madam
The length of the string 'madam' = 5
madam is a palindrome

Enter a string
mam
The length of the string 'mam' = 3
mam is a palindrome
*/