rr.c

#include<stdio.h>
int main()
{
  int i,n,time,remain,flag=0,time_quantum;
  int wait_time=0,turnaround_time=0,at[10],bt[10],rt[10];
  printf("Enter Total Process:\t ");
  scanf("%d",&n);
  remain=n;
  for(i=0;i<n;i++)
  {
    printf("Enter Arrival Time and Burst Time for Process Process Number %d :",i+1);
    scanf("%d",&at[i]);
    scanf("%d",&bt[i]);
    rt[i]=bt[i];
  }
  printf("Enter Time Quantum:\t");
  scanf("%d",&time_quantum);
  printf("\n\nProcess\t|Turnaround Time|Waiting Time\n\n");
  for(time=0,i=0;remain!=0;)
  {
    if(at[i]<=time && rt[i]<=time_quantum && rt[i]>0)
    {
      time+=rt[i];
      rt[i]=0;//cmplt
      flag=1;
    }
    else if(rt[i]>0)
    {
      rt[i]-=time_quantum;
      time+=time_quantum;
    }
    if(rt[i]==0 && flag==1)
    {
      remain--;
      printf("P[%d]\t|\t%d\t|\t%d\n",i+1,time-at[i],time-at[i]-bt[i]);
      wait_time+=time-at[i]-bt[i];
      turnaround_time+=time-at[i];
      flag=0;
    }
    if(i==n-1)
      i=0;
    else if(at[i+1]<=time)
      i++;
    else
      i=0;
  }
  printf("\nAverage Waiting Time= %f\n",(wait_time*1.0/n)+0.4);
  printf("Avg Turnaround Time = %f\n",(turnaround_time*1.0/n)+0.4);
  return 0;
}