StopnWaitProtocol_Demo_Networking

#include <iostream>
#include <stdlib.h>
#include <ctime>

using namespace std;

class timer
{
public:
    int tim()
    {
        time_t t1,t2;
        t1=time(NULL);
        t2=t1;
        cout<<"Sending -->\t\t\t";
        system("ping 127.0.0.1 -n 3 >nul");
            t2=time(NULL);
            if (t2-t1>2)
            {
                cout<<"Timeout.Ack not received\n\nResending -->"<<endl;
                return 0;
            }
            else
            {
                cout<<"Received\n"<<endl;
            }
    }
};

int main()
{
    int n,send;
    timer t;
    cout<<"Enter the number of frames -->";
    cin>>n;
    for (int i=1;i<=n;i++)
    {
        cout<<"Frame "<<i<<endl;
        send=t.tim();
        if (send==0)
        {
            i--;
        }
    }
    return 0;
}