4a.c

#include <stdio.h>
void findWaitingTime(int processes[], int n,
                     int bt[], int wt[])
{
  wt[0] = 0;

  for (int i = 1; i < n; i++)
    wt[i] = bt[i - 1] + wt[i - 1];
}

void findTurnAroundTime(int processes[], int n,
                        int bt[], int wt[], int tat[])
{
  for (int i = 0; i < n; i++)
    tat[i] = bt[i] + wt[i];
}

void findavgTime(int processes[], int n, int bt[])
{
  int wt[n], tat[n], total_wt = 0, total_tat = 0;

  findWaitingTime(processes, n, bt, wt);
  findTurnAroundTime(processes, n, bt, wt, tat);

  printf("Processes   Burst time   Waiting time   Turn around time\n");
  for (int i = 0; i < n; i++)
  {
    total_wt = total_wt + wt[i];
    total_tat = total_tat + tat[i];
    printf("   %d ", (i + 1));
    printf("       %d ", bt[i]);
    printf("       %d", wt[i]);
    printf("       %d\n", tat[i]);
  }
  int s = (float)total_wt / (float)n;
  int t = (float)total_tat / (float)n;
  printf("Average waiting time = %d", s);
  printf("\n");
  printf("Average turn around time = %d ", t);
}

int main(int argc, char const *argv[])
{
  int processes[] = {1, 2, 3};
  int n = sizeof processes / sizeof processes[0];

  int burst_time[] = {10, 5, 8};

  findavgTime(processes, n, burst_time);
  printf("\n");
  return 0;
}