priority scheduling with average of burst time and waiting t

#include<stdio.h>

int main()
{
    int bt[20],p[20],wt[20],tatime[20],pr[20],i,j,n,m,total,avg_wt,avg_time,temp;
    printf("Enter Total Number of Process:");
    scanf("%d",&n);

    printf("\nEnter Burst Time and Priority\n");
    for(i=0;i<n;i++)
    {
        printf("\nP[%d]\n",i+1);
        printf("Burst Time:");
        scanf("%d",&bt[i]);
        printf("Priority:");
        scanf("%d",&pr[i]);
        p[i]=i+1;           //contains process number
    }

    //sorting burst time, priority and process number
    for (i=0; i<n; i++)
    {
        for(m=i+1; m<n; m++)
        {
            if(pr[i]>pr[m])
            {
                (temp=pr[i]), (pr[i] = pr[m]), (pr[m] = temp);

                (temp=bt[i]), (bt[i] = bt[m]), (bt[m] = temp);

                (temp= p[i]), (p[i] = p[m]), (p[m] = temp);

            }

            if (pr[i]==pr[m])
            {
                if(bt[i]>bt[m])
                {
                     (temp=bt[i]), (bt[i] = bt[m]), (bt[m] = temp);

                (temp=pr[i]), (pr[i] = pr[m]), (pr[m] = temp);

                (temp= p[i]), (p[i] = p[m]), (p[m] = temp);
                }

                if(bt[i]==bt[m])
                {
                    if (p[i]>p[m])
                    {
                        (temp= p[i]), (p[i] = p[m]), (p[m] = temp);

                        (temp=bt[i]), (bt[i] = bt[m]), (bt[m] = temp);

                           (temp=pr[i]), (pr[i] = pr[m]), (pr[m] = temp);


                    }

                }
            }
        }


    }


    wt[0]=0;    //waiting time for first process is zero

    //calculate waiting time
    for(i=1;i<n;i++)
    {
        wt[i]=0;
        for(j=0;j<i;j++)
            wt[i]+=bt[j];

        total+=wt[i];
    }

    avg_wt=total/n;      //average waiting time
    total=0;

    printf("\nProcess\t \t Priority    Burst Time    \tWaiting Time\tTurnaround Time");
    for(i=0;i<n;i++)
    {
        tatime[i]=bt[i]+wt[i];     //calculate turnaround time
        total+=tatime[i];
        printf("\nP[%d]\t\t %d\t\t  %d\t\t    %d\t\t\t%d",p[i],pr[i],bt[i],wt[i],tatime[i]);
    }


    avg_time=total/n;     //average turnaround time
    printf("\n\nAverage Waiting Time=%d",avg_wt);
    printf("\nAverage Turnaround Time=%d\n",avg_time);

    return 0;
}