Flow control using the Sliding Window Protocol:

Source Code:

File Name: gobackN.c

#include<stdio.h>

int main() {
    int windowSize, totalFrames, i;
    int frames[50];

    // Prompt the user for the sliding window size
    printf("Enter window size: ");
    scanf("%d", &windowSize);

    // Prompt the user for the number of frames to transmit
    printf("\nEnter number of frames to transmit: ");
    scanf("%d", &totalFrames);

    // Prompt the user to enter all the frames
    printf("\nEnter %d frames: ", totalFrames);
    for(i = 1; i <= totalFrames; i++) {
        scanf("%d", &frames[i]);
    }

    // Display the transmission process
    printf("\nSliding Window Protocol Simulation (Assuming No Frame Loss/Corruption)\n");
    printf("Sender sends %d frames at a time and waits for acknowledgement.\n\n", windowSize);

    for(i = 1; i <= totalFrames; i++) {
        // Send frame
        printf("%d ", frames[i]);

        // Check if the window is full
        if(i % windowSize == 0) {
            printf("\nAcknowledgement of above frames is received by sender\n\n");
        }
    }

    // If remaining frames are less than window size
    if(totalFrames % windowSize != 0) {
        printf("\nAcknowledgement of above frames is received by sender\n");
    }

    return 0;
}

Output:

$ gcc gobackN.c
$ ./a.out
Enter window size: 3

Enter number of frames to transmit: 7

Enter 7 frames: 10 20 30 40 50 60 70

Sliding Window Protocol Simulation (Assuming No Frame Loss/Corruption)
Sender sends 3 frames at a time and waits for acknowledgement.

10 20 30
Acknowledgement of above frames is received by sender

40 50 60
Acknowledgement of above frames is received by sender

70
Acknowledgement of above frames is received by sender