PRIORITY PROGRAM

#include <stdio.h>

int main() {
    int n, i, j, temp, sum_wait = 0, sum_turnaround = 0;
    float avg_wait, avg_turnaround;
    int priority[20], bt[20], wt[20], tat[20];

    printf("Enter the number of processes: ");
    scanf("%d", &n);

    // Input burst times and priorities for each process
    printf("Enter burst times and priorities for each process:\n");
    for (i = 0; i < n; i++) {
        printf("Process %d: ", i + 1);
        scanf("%d%d", &bt[i], &priority[i]);
    }

    // Sort processes based on priority (ascending order)
    for (i = 0; i < n - 1; i++) {
        for (j = i + 1; j < n; j++) {
            if (priority[i] > priority[j]) {
                temp = priority[i];
                priority[i] = priority[j];
                priority[j] = temp;
                temp = bt[i];
                bt[i] = bt[j];
                bt[j] = temp;
            }
        }
    }

    // Calculate waiting time for each process
    wt[0] = 0; // Waiting time for first process is zero
    for (i = 1; i < n; i++) {
        wt[i] = wt[i - 1] + bt[i - 1];
        sum_wait += wt[i];
    }

    // Calculate turnaround time for each process
    for (i = 0; i < n; i++) {
        tat[i] = wt[i] + bt[i];
        sum_turnaround += tat[i];
    }

    // Calculate average waiting time and average turnaround time
    avg_wait = (float)sum_wait / n;
    avg_turnaround = (float)sum_turnaround / n;

    // Print process details
    printf("\nProcess\tBT\tPriority\tWT\tTAT\n");
    for (i = 0; i < n; i++) {
        printf("P%d\t%d\t%d\t\t%d\t%d\n", i + 1, bt[i], priority[i], wt[i], tat[i]);
    }

    // Print average waiting time and average turnaround time
    printf("\nAverage Waiting Time: %.2f\n", avg_wait);
    printf("Average Turnaround Time: %.2f\n", avg_turnaround);

    return 0;
}