fcfs.c

/*
  FCFS Disk Scheduling Implementation

*/

#include <stdio.h>
#include <stdlib.h>


int main(){
  int queue[100], q_size, head, seek =0, diff;
  float avg;

  printf("%s\n", "***FCFS Disk Scheduling Algorithm***");

  printf("%s\n", "Enter the size of the queue");
  scanf("%d", &q_size);

  printf("%s\n", "Enter queue elements");
  for(int i=1; i<=q_size; i++){
    scanf("%d",&queue[i]);
  }

  printf("%s\n","Enter initial head position");
  scanf("%d", &head);

  queue[0]=head;

  for(int j=0; j<=q_size-1; j++){
    diff = abs(queue[j]-queue[j+1]);
    seek += diff;
    printf("Move from %d to %d with Seek %d\n",queue[j],queue[j+1],diff);
  }

  printf("\nTotal seek time is %d\t",seek);
  avg = seek/(float)q_size;
  printf("\nAverage seek time is %f\t", avg);

  return 0;
}