#include<iostream>
#include<conio.h>
#include<stdio.h>
#include<string.h>
using namespace std;
int key;
void binarysearch(int[],int, int);

void binarysearch(int ar[],int low,int high)
{

    while(low<=high)
    {
        int mid=(low+high)/2;
        if(ar[mid]==key)
        {
            cout<<"element found at position:"<<mid+1;
            return;
        }
        if(ar[mid]>key)
            high=mid-1;
        else
            low=mid+1;
    }
    cout<<"element not found";
}

int main()
{
   
	int ar[20],m,i;
	cout<<"enter the size of array\n";
	cin>>m;
	cout<<"enter the elements of the array\n";
	for(i=0;i<m;i++)
		cin>>ar[i];
    cout<<"enter element to search";
    cin>>key;
    binarysearch(ar,0,m);
	getch();
	return 0;
}