4b.c

#include <stdio.h>
int main(int argc, char const *argv[])
{
  int bt[20], p[20], wt[20], tat[20], i, j, n, total = 0, pos, temp;
  float avg_wt, avg_tat;
  printf("Enter number of process:");
  scanf("%d", &n);

  printf("\nEnter Burst Time:\n");
  for (i = 0; i < n; i++)
  {
    printf("p%d:", i + 1);
    scanf("%d", &bt[i]);
    p[i] = i + 1;
  }

  //sorting of burst times
  for (i = 0; i < n; i++)
  {
    pos = i;
    for (j = i + 1; j < n; j++)
    {
      if (bt[j] < bt[pos])
        pos = j;
    }

    temp = bt[i];
    bt[i] = bt[pos];
    bt[pos] = temp;

    temp = p[i];
    p[i] = p[pos];
    p[pos] = temp;
  }

  wt[0] = 0;

  for (i = 1; i < n; i++)
  {
    wt[i] = 0;
    for (j = 0; j < i; j++)
      wt[i] += bt[j];

    total += wt[i];
  }

  avg_wt = (float)total / n;
  total = 0;

  printf("\nProcess\t    Burst Time    \tWaiting Time\tTurnaround Time");
  for (i = 0; i < n; i++)
  {
    tat[i] = bt[i] + wt[i];
    total += tat[i];
    printf("\np%d\t\t  %d\t\t    %d\t\t\t%d", p[i], bt[i], wt[i], tat[i]);
  }
  avg_tat = (float)total / n;
  printf("\n\nAverage Waiting Time=%f", avg_wt);
  printf("\nAverage Turnaround Time=%f\n", avg_tat);
}