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#include<stdio.h>
 
int Bsearch(int *a, int n, int item)
{
 
int beg,end,mid;
 
beg=0;
end=n-1;
 
while(beg<=end)
{
 
mid=(beg+end)/2;
 
if(a[mid]==item)
return mid;
else if(a[mid]>item)
end=mid-1;
else if(a[mid]<item)
beg=mid+1;
 
}
 
return -1;
}
 
 
main()
{
int a[50],n,i;
int item,pos;
 
printf("Enter size of your array: ");
scanf("%d",&n);
 
printf("Enter elements of your array: ");
for(i=0; i<n; i++)
scanf("%d",&a[i]);
 
printf("Enter item to search: ");
scanf("%d",&item);
 
pos=Bsearch(a,n,item);
 
if(pos==-1)
printf(" NOT FOUND. ");
else
printf(" FOUND AT %d", (pos+1));
 
}