#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>

int main()
{
    int sd, sd2, clilen, sport, i, client_socket, count = 0, val;
    int port;
    char data[50], senderdata[50];
    int window_size;
    int frame = 0;
    int ACK;

    struct sockaddr_in servaddr, cliaddr;
    printf("Enter Server Port : ");
    scanf("%d", &sport;);
    printf("Server Port : %dn", sport);
    sd = socket(AF_INET, SOCK_STREAM, 0);
    if (sd < 0)
    {
        printf("Can't create Socketn");
    }
    else
    {
        printf("Socket Createdn");
    }
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(sport);
    sd2 = bind(sd, (struct sockaddr *)&servaddr;, sizeof(servaddr));
    if (sd2 < 0)
    {
        printf("Can't Bindn");
    }
    else
    {
        printf("Bindedn");
    }

    listen(sd, 5);
    clilen = sizeof(cliaddr);
    client_socket = accept(sd, (struct sockaddr *)&cliaddr;, &clilen;);
    if (client_socket < 0)
    {
        printf("Can't Acceptn");
    }
    else
    {
        printf("Acceptedn");
    }
    recv(client_socket, &window;_size, sizeof(window_size), 0);
    while (frame < window_size)
    {
        for (i = 0; i < window_size; i++)
        {
            recv(client_socket, &frame;, sizeof(frame), 0);
            printf("Transmitted frames received from the Clientn");
            frame++;
            if (frame == window_size)
            {
                break;
            }
        }
        printf("nEnter the negative acknowledgment to be sent to the Client : ");
        scanf("%d", &ACK;);
        send(client_socket, &ACK;, sizeof(ACK), 0);
        if (ACK == window_size)
        {
            break;
        }
        else
        {
            frame = ACK;
        }
    }
    return 0;
}