#include<iostream>
#include<cmath>
#include<conio.h>
#include<stdlib.h>
#include<ctime>
using namespace std;
class Q4{
public:
int a,m,s,*arr,ws;
Q4();
void correctframe(int);
void acknowledgementlost(int);
void framelost(int);
void delayinframe(int);
void window(int);
void resend(int);
};
Q4::Q4(){
cout<<"Enter the number of frames: ";
cin>>a;
cout<<"Enter the window size(value of m): ";
cin>>m;
s=pow(2,m-1);
cout<<"Window size:"<<s<<endl;
ws=pow(2,m);
arr=new int[s];
cout<<"Sequence of sending frame :"<<ws<<endl;
cout<<"Sequencial numbers of rame to be used :";
for(int i=0;i<ws;i++)
{
cout<<i<<" ";
}cout<<endl;
}
void Q4::correctframe(int i)
{
cout<<"\t\t\tRecieving Frames from Sender"<<endl;
cout<<"\t\t\t\tSending acknowledgement to sender"<<endl;
getch();
cout<<"Acknowledgement recieved for frame f"<<(i-1)%ws<<"\n";
getch();
}
void Q4::acknowledgementlost(int i)
{
cout<<"\t\t\tRecieving Frames from Sender"<<endl;
cout<<"\t\t\t\tSending acknowledgement to sender"<<endl;
getch();
cout<<"\t\t Acknowledgement lost by the reciever for frame f"<<(i-1)%ws<<"\n";
getch();
resend(i);
getch();
cout<<"\t\t\t\tSending acknowledgement to sender"<<endl;
cout<<"Acknowledgement recieved for frame f"<<(i-1)%ws<<"\n";
getch();
cout<<"Sliding Window....Sending next frame"<<endl;
getch();
}
void Q4::framelost(int i)
{
cout<<"\t\t\tRecieving Frames from Sender"<<endl;
cout<<"\t\t Frame f"<<(i-1)%ws<<" is lost\n";
getch();
resend(i);
getch();
cout<<"\t\t\t\tSending acknowledgement to sender"<<endl;
getch();
cout<<"Acknowledgement recieved for frame f"<<(i-1)%ws<<"\n";
getch();
cout<<"Sliding Window....Sending next frame"<<endl;
getch();
}
void Q4::delayinframe(int i)
{
cout<<"\t\t\tRecieving Frames from Sender"<<endl;
cout<<"\t\t There is a delay in sending the frame f"<<(i-1)%ws<<" from the sender\n";
getch();
resend(i);
getch();
cout<<"\t\t\t\tSending acknowledgement to sender"<<endl;
getch();
cout<<"Acknowledgement recieved for frame f"<<(i-1)%ws<<"\n";
getch();
cout<<"Sliding Window....Sending next frame"<<endl;
getch();
}
void Q4::resend(int i){
cout<<"\nFrames in the current window are: ";
for(int j=0;j<s;j++){
if((j+i)<=a){
arr[j]=j+i;
cout<<arr[j]<<" ";
}
}
cout<<endl;
getch();
cout<<"\nSequencial number Of Frames in window: ";
for(int j=0;j<s;j++){
if((j+i)<=a){
arr[j]=j+i;
cout<<(i+j-1)%ws<<" ";
}
}
cout<<endl;
getch();
/* for(int j=0;j<s;j++){
arr[j]=j+i;
if((j+i)<=a){
cout<<"Frame f"<<(j+i-1)%ws<<" \n";
}
}*/
int j=0;
if(j+i<=a)
{
cout<<"Resending frame f"<<(i-1)%ws<<endl;
getch();
j++;
}
}
void Q4::window(int i){
cout<<endl;
for(int j=0;j<s;j++){
if((j+i)<=a){
arr[j]=j+i;
if(i==1){
cout<<"Sending frame f"<<(j+i-1)%ws<<"\n";
}
}
}
if(i!=1&&i<=a-s+1){
cout<<"Sending frame f"<<arr[s-1]<<"\n";
getch();
}
}
int main(){
Q4 obj;
int r;
srand(time(0));
cout<<"SENDER'S SIDE\n RECIEVER'S SIDE"<<endl;
for(int i=1;i<=obj.a;i++){
r=rand()%4;
obj.window(i);
switch(r){
case 0:{
obj.correctframe(i);
break;
}
case 1:{
obj.acknowledgementlost(i);
break;
}
case 2:{
obj.framelost(i);
break;
}
case 3:{
obj.delayinframe(i);
break;
}
default:
cout<<"Invalid choice\n";
}
}
cout<<endl<<endl<<"All frames are sent successfully";
getch();
return 0;
}
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