OS: PREEMPTIVE PRIORITY SCHEDULING

#include<stdio.h>
#include<conio.h>

int main()
{
  int i,j,n,t,wt=0,tat=0,s;
  int a[10],b[10],pr[10],rem[10],r; //rem = ring Time
    clrscr();
  printf("Enter no of Processes : ");
  scanf("%d",&n);
  r=n;
  for(i=0;i<n;i++)
  {
    printf("\nProcess %d\n",i+1);



    printf("Arrival:");
    scanf("%d",&a[i]);

    printf("Burst:");
    scanf("%d",&b[i]);


    printf("Priority:");
    scanf("%d",&pr[i]);

        rem[i]=b[i];
  }


  pr[9]=11;
  printf("\nProcess\t\t TAT\t\t WT \n");
  printf("----------------------------------------------\n") ;
  for(t=0;r!=0;t++)
  {
    s=9;
    for(i=0;i<n;i++)
    {
      if(a[i]<=t && pr[i]<pr[s] && rem[i]>0)
      {
    s=i;
      }
    }
    rem[s]--;
    if(rem[s]==0)
    {
      r--;
      printf("P[%d]\t \t%d\t \t%d\n",s+1,t+1-a[s],t+1-a[s]-b[s]);
      wt+=t+1-a[s];
      tat+=t+1-a[s]-b[s];
    }
  }
  printf("\nAvg WT = %f\n",wt*1.0/n);
  printf("Avg TAT = %f",tat*1.0/n);
  getch();
  return 0;
}