FCFS.c

#include<stdio.h> 
#include<conio.h>
 main()
 {
       int bt[20], wt[20], tat[20], i, n;
       float wtavg, tatavg; 
       clrscr();
                   printf("\nEnter the number of processes -- ");
                  scanf("%d", &n);
 for(i=0;i<n;i++)
 { 
                      printf("\nEnter Burst Time for Process %d -- ", i);
                       scanf("%d", &bt[i]);
 }
      wt[0] = wtavg = 0; 
     tat[0] = tatavg = bt[0];
     for(i=1;i<n;i++) 
{
                     wt[i] = wt[i-1] +bt[i-1];
                    tat[i] = tat[i-1] +bt[i];
                    wtavg = wtavg + wt[i]; 
                    tatavg = tatavg + tat[i]; 
}
 printf("\t PROCESS \tBURST TIME \t WAITING TIME\t TURNAROUND  TIME\n");       
for(i=0;i<n;i++)
          printf("\n\t P%d \t\t %d \t\t %d \t\t %d", i, bt[i], wt[i], tat[i]); 
          printf("\nAverage Waiting Time -- %f", wtavg/n); 
          printf("\nAverage Turnaround Time -- %f", tatavg/n); 
getch();
 }