/*Check email addresses*/

#include <stdio.h>
#include <stdlib.h>

void usage(char *app)
{
    printf("usage %s <email> [email]", app);
}

int process(int argc, char *argv[])
{
    char *email = argv[1];
    int darabkukac=0, pontdarab=0;
    char *p, *q;
    p = email;
    if (p == NULL)
        return EXIT_FAILURE;
    q = email;
    if (q == NULL)
        return EXIT_FAILURE;

    while (*p != '\0')
    {
        if ((*p) == '@')
            darabkukac++;
        p = p++;
    }

    while (*q != '\0')
    {
        if ((*q) == '.')
            pontdarab++;
        q = q++;
    }
    if ((darabkukac == 1) && (pontdarab >= 1))
        printf("The email is correct.\n");
    else
        printf("The email is incorrect.\n");

        return EXIT_SUCCESS;
}


int main(int argc, char *argv[])
{
    if (argc == 1)
    {
        usage(argv[0]);
        return EXIT_SUCCESS;
    }
    return process(argc, argv);
}