waiting time and bust time in operating system lab

#include<stdio.h>

void main()
{

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

    //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",i,bt[i],wt[i],tat[i]);
    }
}