FCFS_Variable_Arrival_Time.cpp

    #include<iostream>
    using namespace std;

    void findWaitingTime(int processes[], int n, int bt[], int wt[], int at[])
    {
        int service_time[n];
        service_time[0] = at[0];
        wt[0] = 0;

        for (int i = 1; i < n ; i++)
        {
            service_time[i] = service_time[i-1] + bt[i-1];

            wt[i] = service_time[i] - at[i];

            if (wt[i] < 0)
                wt[i] = 0;
        }
    }

    void findTurnAroundTime(int processes[], int n, int bt[], int wt[], int tat[])
    {
        for (int i = 0; i < n ; i++)
            tat[i] = bt[i] + wt[i];
    }

    void findavgTime(int processes[], int n, int bt[], int at[])
    {
        int wt[n], tat[n];

        findWaitingTime(processes, n, bt, wt, at);

        findTurnAroundTime(processes, n, bt, wt, tat);

        cout << "Processes " << " Burst Time " << " Arrival Time " << " Waiting Time " << " Turn-Around Time " << " Completion Time \n";
        int total_wt = 0, total_tat = 0;
        for (int i = 0 ; i < n ; i++)
        {
            total_wt = total_wt + wt[i];
            total_tat = total_tat + tat[i];
            int compl_time = tat[i] + at[i];
            cout << " " << i+1 << "\t\t" << bt[i] << "\t\t" << at[i] << "\t\t" << wt[i] << "\t\t " << tat[i] << "\t\t " << compl_time << endl;
        }

        cout << "Average waiting time = " << (float)total_wt / (float)n;
        cout << "\nAverage turn around time = " << (float)total_tat / (float)n;
    }

    int main()
    {   
        int np;
        cout << "Enter number of processes: ";
        cin >> np;
        int processes[np];
        for(int &i : processes)
        {
            cin >> i;
        }
        int n = sizeof processes / sizeof processes[0];

        int burst_time[np];
        cout << "Enter burst time of processes: ";
        for(int &i : burst_time)
        {
            cin >> i;
        }

        int arrival_time[np];
        cout << "Enter arrival time of processes: ";
        for(int &i : arrival_time)
        {
            cin >> i;
        }

        findavgTime(processes, n, burst_time, arrival_time);

        return 0;
    }