fcfs.txt

#include<iostream>
using namespace std;

void swap(int *a, int *b) {
    int temp = *a;
    *a = *b;
    *b = temp;
}

int main() {
    int n;
    cout << "Enter the number of processes: ";
    cin >> n;

    int p[n], art[n], bt[n], wt[n], tat[n], et[n], scale = 0;
    float awt = 0, atat = 0;

    cout << "Enter the arrival time and burst time of each process:\n";
    for (int i = 0; i < n; i++) {
        cout << "Process " << i + 1 << ": ";
        cin >> art[i] >> bt[i];
        p[i] = i + 1;
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (art[i] < art[j]) {
                swap(&art[i], &art[j]);
                swap(&bt[i], &bt[j]);
                swap(&p[i], &p[j]);
            }
        }
    }

    wt[0] = 0;
    for (int i = 1; i < n; i++) {
        scale += bt[i - 1];
        wt[i] = scale - art[i];
        awt += wt[i];
    }

    for (int i = 0; i < n; i++) {
        tat[i] = bt[i] + wt[i];
        atat += tat[i];
    }

    awt /= n;
    atat /= n;

    cout << "Process\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n";
    for (int i = 0; i < n; i++) {
        cout << "P " << p[i] << "\t\t" << art[i] << "\t\t" << bt[i] << "\t\t" << wt[i] << "\t\t" << tat[i] << "\n";
    }

    cout << "Average Waiting Time = " << awt << endl;
    cout << "Average Turnaround Time = " << atat << endl;

    return 0;
}