gobackn.c

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
int main()
{
    int numofframes, windowsize;
    int tr = 0;
    srand(time(NULL));
    printf("Enter the number of frames : ");
    scanf("%d", &numofframes);
    printf("Enter the Window Size : ");
    scanf("%d", &windowsize);
    int i = 1;
    while (i <= numofframes)
    {
        int x = 0;
        for (int j = i; j < i + windowsize && j <= numofframes; j++)
        {
            printf("Sent Frame %d \n", j);
            tr++;
        }
        for (int j = i; j < i + windowsize && j <= numofframes; j++)
        {
            int flag = rand() % 2;
            if (!flag)
            {
                printf("%d : Acknowledged! \n", j);
                x++;
            }
            else
            {
                printf("Frame %d Not Received \n", j);
                printf("Retransmitting Window \n");
                break;
            }
        }
        printf("\n");
        i += x;
    }
    printf("Total number of transmissions : %d \n", tr);
    return 0;
}