C Program to Check if a given String is Palindrome

C Program to Check if a given String is Palindrome

/*
 * C program to read a string and check if it's a palindrome, without
 * using library functions. Display the result.
 */
#include <stdio.h>
#include <string.h>

void main()
{
    char string[25], reverse_string[25] = {'\0'};
    int  i, length = 0, flag = 0;

    fflush(stdin);
    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++;
    }
    for (i = length - 1; i >= 0; i--)
    {
       reverse_string[length - i - 1] = string[i];
    }
    /*
     * Compare the input string and its reverse. If both are equal
     * then the input string is palindrome.
     */
    for (i = 0; i < length; i++)
    {
        if (reverse_string[i] == string[i])
            flag = 1;
        else
            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
sanfoundry
sanfoundry is not a palindrome

 Enter a string
malayalam
malayalam is a palindrome