cn_3.cpp

#include<iostream>
#include <time.h>
#include <cstdlib>
#include<ctime>
#include <unistd.h>
#include<iomanip>
using namespace std;
class timer {
   private:
    unsigned long begTime;
   public:
    void start() {
     begTime = clock();
    }
 unsigned long elapsedTime() {
     return ((unsigned long) clock() - begTime) / CLOCKS_PER_SEC;
   }
  bool isTimeout(unsigned long seconds) {
     return seconds >= elapsedTime();
    }
};
int main()
{
int frames[] = {1,2,3,4,5,6,7,8,9,10};
unsigned long seconds = 5;
srand(time(NULL));
timer t;
cout<<"Sender has to send frames : ";
for(int i=0;i<10;i++)
    cout<<frames[i]<<" ";
cout<<endl;
int count = 0;
bool delay = false;
cout<<endl<<"Sender\t\t\t\t\tReceiver"<<endl;
do
{
    bool timeout = false;
    cout<<"Sending Frame : "<<frames[count];
    cout.flush();
    cout<<"\t\t";
    t.start();
    if(rand()%2)
    {
        int to = 24600 + rand()%(64000 - 24600)  + 1;
        for(int i=0;i<64000;i++)
            for(int j=0;j<to;j++) {}
    }
    if(t.elapsedTime() <= seconds)
    {
        cout<<"Received Frame : "<<frames[count]<<" ";
        if(delay)
        {
            cout<<"Duplicate";
            delay = false;
        }
        cout<<endl;
        count++;
    }
    else
    {
        cout<<"---"<<endl;
        cout<<"Timeout"<<endl;
        timeout = true;
    }
    t.start();
    if(rand()%2 || !timeout)
    {
        int to = 24600 + rand()%(64000 - 24600)  + 1;
        for(int i=0;i<64000;i++)
            for(int j=0;j<to;j++) {}
        if(t.elapsedTime() > seconds )
        {
            cout<<"Delayed Ack"<<endl;
            count--;
            delay = true;
        }
        else if(!timeout)
            cout<<"Acknowledgement : "<<frames[count]-1<<endl;
    }
}while(count!=10);
return 0;
}