Write a program fo binary search.

#include <stdio.h>

main()
{
int arr[20],start,end,middle,n,i,item;

printf("How many elements you want to enter in the array : ");
scanf("%d",&n);
for(i=0; i < n; i++)
{
printf("Enter element %d : ",i+1);
scanf("%d",&arr[i]);
}
printf("Enter the element to be searched : ");
scanf("%d",&item);
start=0;
end=n-1;
middle=(start+end)/2;
while(item != arr[middle] && start <= end)
{
if(item > arr[middle])
start=middle+1;
else
end=middle-1;
middle=(start+end)/2;
}
if(item==arr[middle])
printf("%d found at position %d\n",item,middle+1);
if(start>end)
printf("%d not found in array\n",item);
}/*End of main()*/