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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int n, tq, i, time = 0, done = 0;
  5.     int bt[20], rem[20], wt[20], tat[20];
  6.  
  7.     printf("Enter number of processes: ");
  8.     scanf("%d", &n);
  9.  
  10.     if (n <= 0) {
  11.         printf("Invalid number of processes.\n");
  12.         return 0;
  13.     }
  14.  
  15.     printf("Enter burst time for each process:\n");
  16.     for (i = 0; i < n; i++) {
  17.         printf("P%d: ", i + 1);
  18.         scanf("%d", &bt[i]);
  19.         rem[i] = bt[i];
  20.         wt[i] = 0;  // Initialize waiting time
  21.     }
  22.  
  23.     printf("Enter time quantum: ");
  24.     scanf("%d", &tq);
  25.  
  26.     if (tq <= 0) {
  27.         printf("Invalid time quantum.\n");
  28.         return 0;
  29.     }
  30.  
  31.     while (done < n) {
  32.         for (i = 0; i < n; i++) {
  33.             if (rem[i] > 0) {
  34.                 if (rem[i] > tq) {
  35.                     time += tq;
  36.                     rem[i] -= tq;
  37.                 } else {
  38.                     time += rem[i];
  39.                     wt[i] = time - bt[i];
  40.                     rem[i] = 0;
  41.                     done++;
  42.                 }
  43.             }
  44.         }
  45.     }
  46.  
  47.     float total_wt = 0, total_tat = 0;
  48.  
  49.     for (i = 0; i < n; i++) {
  50.         tat[i] = wt[i] + bt[i];
  51.         total_wt += wt[i];
  52.         total_tat += tat[i];
  53.     }
  54.  
  55.     printf("\nProcess\tBT\tWT\tTAT\n");
  56.     for (i = 0; i < n; i++) {
  57.         printf("P%d\t%d\t%d\t%d\n", i + 1, bt[i], wt[i], tat[i]);
  58.     }
  59.  
  60.     printf("\nAverage Waiting Time     = %.2f", total_wt / n);
  61.     printf("\nAverage Turnaround Time  = %.2f\n", total_tat / n);
  62.  
  63.     return 0;
  64. }
  65.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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Enter number of processes: 3
Enter burst times:
P1: 5
P2: 7
P3: 4
Enter time quantum: 2
stdout
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Enter number of processes: Invalid number of processes.
https://ideone.com/27yFhD
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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