SJF Non Premptive.c

#include<stdio.h>
struct process{
int id,at,bt,ct,tat,wt,status;
};
void main(){
struct process p[100];
float tot_tat=0,avg_tat,tot_wt=0,avg_wt;
int current_time=0,min_bt,completed=0,index,n,i;
printf("enter the no of process\n");
scanf("%d",&n);
printf("enter the process details\n");
for(i=0;i<n;i++){
printf("enter the id,at,bt");
scanf("%d%d%d",&p[i].id,&p[i].at,&p[i].bt);
p[i].status=0;
}
while(completed!=n){
min_bt=32765;
index=-1;
for(i=0;i<n;i++){
if((p[i].at<=current_time)&&(p[i].status==0)){
if(min_bt>p[i].bt){
min_bt=p[i].bt;
index=i;
}}}
if(index==-1){
current_time++;
}
else{
p[index].ct=current_time+p[index].bt;
current_time=current_time+p[index].bt;
p[index].status=1;
completed++;
}}
for(i=0;i<n;i++){
p[i].tat=p[i].ct-p[i].at;
tot_tat=tot_tat+p[i].tat;
p[i].wt=p[i].tat-p[i].bt;
tot_wt=tot_wt+p[i].wt;
}
avg_tat=tot_tat/n;
avg_wt=tot_wt/n;
printf("pid \t at\t bt \t ct \t tat \t wt \n");
for(i=0;i<=n-1;i++){
printf("%d\t%d\t%d\t%d\t%d\t%d\n",p[i].id,p[i].at,p[i].bt,p[i].ct,p[i].tat,p[i].wt);
}
printf("\naverage turn around time=%f\naverage waiting time=%f\n",avg_tat,avg_wt);
}