shortest job first of operating system in c

#include<stdio.h>

void main()
{

    int bt[20], wt[20], tat[20], i, n,p[20],temp=0,k;
    float wtavg, tatavg;
    printf ("Enter the no. of process: ");
    scanf("%d",&n);
    for(i=0; i<n; i++)
    {
        p[i]=i;
        printf ("Enter burst time for processed %d:",i);
        scanf ("%d", &bt[i]);
    }
    for(i=0; i<n;i++)
    {

        for(k=i+1; k<n;k++)
        {
            if(bt[i]>bt[k])
            {
                temp=bt[i];
                bt[i]=bt[k];
                bt[k]=temp;

                temp=p[i];
                p[i]=p[k];
                p[k]=temp;
            }
        }
    }


    //waiting time & TA time
    wt[0]=0;
    tat[0]=bt[0];

    for(i=1; i<n; i++)
    {
        wt[i]=tat[i-1];
        tat[i]=bt[i]+wt[i];
    }
       printf("\t process \t Bust time \t waiting time \t turnarandT");
    for(i=0; i<n; i++)
    {
        printf("\n\t p%d   \t\t%d \t\t%d \t\t%d",p[i],bt[i],wt[i],tat[i]);
    }
}