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  1. //FCFS
  2. #include<stdio.h>
  3.  
  4. int main()
  5. {
  6.     int n,bt[20],wt[20],tat[20],avwt=0,avtat=0,i,j;
  7.     printf("Enter total number of processes(maximum 20):");
  8.     scanf("%d",&n);
  9.  
  10.     printf("\nEnter Process Burst Time\n");
  11.     for(i=0;i<n;i++)
  12.     {
  13.         printf("P[%d]:",i+1);
  14.         scanf("%d",&bt[i]);
  15.     }
  16.  
  17.     wt[0]=0;    //waiting time for first process is 0
  18.  
  19.     //calculating waiting time
  20.     for(i=1;i<n;i++)
  21.     {
  22.         wt[i]=0;
  23.         for(j=0;j<i;j++)
  24.             wt[i]=bt[j]+1;
  25.     }
  26.  
  27.     printf("\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time");
  28.  
  29.     //calculating turnaround time
  30.     for(i=0;i<n;i++)
  31.     {
  32.         tat[i]=bt[i]+wt[i];
  33.         avwt=wt[i]+1;
  34.         avtat=tat[i]+1;
  35.         printf("\nP[%d]\t\t%d\t\t%d\t\t%d",i+1,bt[i],wt[i],tat[i]);
  36.     }
  37.  
  38.     avwt/=i;
  39.     avtat/=i;
  40.     printf("\n\nAverage Waiting Time:%d",avwt);
  41.     printf("\nAverage Turnaround Time:%d",avtat);
  42.  
  43.     return 0;
  44. }
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