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

struct arg_struct{
    int
}

    int inverse(int N, int chisl)
    {
        char buffer[BUF];
        int resbuffer[BUF];

        snprintf(buffer, sizeof(buffer), "%d", chisl);

        for(int i=0; i< strlen(buffer); i++)
        {
            resbuffer[strlen(buffer)-i-1] = abs(N - chisl%10 - 1);

            //printf("OSNOV %d - CIFRA %d - 1 = %d\n",N,chisl%10, N - chisl%10 - 1);

            chisl=chisl/10;
        }
        int inversed=0;
        for(int i=0; i<strlen(buffer); i++) inversed=10*inversed+resbuffer[i];
        //printf("%d", inversed);

        return inversed;
    }

static void wait_thread(void)
{
    time_t start_time = time(NULL);

    while (time(NULL) == start_time)
    {
        /* do nothing except chew CPU slices for up to one second. */
    }
}

static void *thread_func(void *vptr_args)
{

    //int convert(int N,int chisl, int length)
    //{
        int result=0;
        for(int i=0; i<length; i++)
        {
            result += chisl%10 * pow(N, i);
            chisl = chisl / 10;
        }
   //}
    int i;

    for (i = 0; i < 20; i++)
    {
        fputs("  b\n", stderr);
        wait_thread();
    }

    return NULL;
}

static void *thread_func(void *vptr_args)
{
    int i;

    for (i = 0; i < 20; i++)
    {
        fputs("  b\n", stderr);
        wait_thread();
    }

    return NULL;
}

int main(void)
{
    int i;
    pthread_t thread1,thread2;

    if (pthread_create(&thread1, NULL, convert, NULL) != 0)
    {
        return EXIT_FAILURE;
    }

    if (pthread_create(&thread2, NULL, inverse, NULL) != 0)
    {
        return EXIT_FAILURE;
    }

    for (i = 0; i < 20; i++)
    {
        puts("a");
        wait_thread();
    }

    if (pthread_join(thread, NULL) != 0)
    {
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}