Program For SJF (Non-Preemptive)

#include<stdio.h>
 int main()
{
    int bt[20],p[20],wt[20],tat[20],i,j,n,total=0,pos,temp;
    float avg_wt,avg_tat;
    printf("Enter number of process:");
    scanf("%d",&n);
    printf("\nEnter Burst Time:\n");
    for(i=0;i<n;i++)
    {
        printf("%d:",i+1);
        scanf("%d",&bt[i]);
        p[i]=i+1;         
    }
    for(i=0;i<n;i++)
    { 
     pos=i;
        for(j=i+1;j<n;j++)
        {
            if(bt[j]<bt[pos])
                pos=j;
        }
        temp=bt[i];
        bt[i]=bt[pos];
        bt[pos]=temp;
        temp=p[i];
        p[i]=p[pos];
        p[pos]=temp;
    }
    wt[0]=0;            
    for(i=1;i<n;i++)
    {
        wt[i]=0;
        for(j=0;j<i;j++)
            wt[i]+=bt[j];
  
        total+=wt[i];
    }
    avg_wt=(float)total/n;      
    total=0;
    printf("\nProcess\t    Burst Time    \tWaiting Time\tTurnaround Time");
    for(i=0;i<n;i++)
    {
        tat[i]=bt[i]+wt[i];   
        total+=tat[i];
        printf("\n%d\t\t  %d\t\t    %d\t\t\t%d",p[i],bt[i],wt[i],tat[i]);
    }
    avg_tat=(float)total/n;    
    printf("\n\nAverage Waiting Time=%f",avg_wt);
    printf("\nAverage Turnaround Time=%f\n",avg_tat);
}


OUTPUT:
Enter Burst Time:
1:4
2:3
3:7
4:1
5:2
Process     Burst Time          Waiting Time    Turnaround Time
4                 1                 0                   1
5                 2                 1                   3
2                 3                 3                   6
1                 4                 6                   10
3                 7                 10                  17

Average Waiting Time=4.000000
Average Turnaround Time=7.400000