include<stdio.h>
int timer=0,wait_for_ack=-1,frameQ=0,cansend=1,t=0;
 main()
{
        int i,j,k;
        int frame[5];
        //clrscr();
        printf("enter the time when data frame will be ready\n");
        for(j=0;j<3;j++)
        {

                sender( i, &frame);
                recv(i);
        }
}
                {
                        wait_for_ack++;
                        if(wait_for_ack==3)
                        {
                }
                if(i==frame[t])
                {
                        frameQ++;
                        t++;
                }
                if(frameQ==0)
                        printf("NO FRAME TO SEND at time=%d \n",i);

                if(frameQ>0 && cansend==1)
                {
                        printf("FRAME SEND AT TIME=%d\n",i);
                        cansend=-1;
                        frameQ--;
                        timer++;
                        printf("timer in sender=%d\n",timer);
                 }
                if(frameQ>0 && cansend==-1)
                        printf("FRAME IN Q FOR TRANSMISSION AT TIME=%d\n",i);
                if(frameQ>0)
                        t++;
        printf("frameQ=%d\n",frameQ);
        printf("i=%d     t=%d\n",i,t);
        printf("value in frame=%d\n",frame[t]);
        //      return 0;
        }





        recv(int i )
        {   printf("
timer in recvr=%d\n",timer);
                if(timer>0)
                {
                        timer++;
                }
                        if(timer==3)
                        {
                                printf("
            FRAME ARRIVED AT TIME=%d\n",i);
                                wait_for_ack=0;
                                timer=0;
                        }
                        else
                                printf("
            WAITING FOR FRAME AT TIME %d\n",i);
//                              return 0;

        }