Binary

#include<bits/stdc++.h>
using namespace std;
int Binary_Search(int arr[],int n,int index)
{
    int f=0, l=n;
    while(f<l){
        int mid=(f+l)/2;
        
        if(arr[mid]==index){
            return mid+1;
        }
        else if(arr[mid]>index){
            l=mid-1;
        }
        else{
            f=mid+1;
        }
    }    
return -1;
}
int main(){
    int n, arr[n], index;
    cout<<"Enter the length of array: "<<endl;
    cin>>n;
    cout<<"Enter the array: "<<endl;
    for(int i=0;i<n;i++)
    {
       cin>>arr[i];
    }
    cout<<"Enter the element you want to search: "<<endl;
    cin>>index;
    
    cout<<"The element is at position: "<<Binary_Search(arr, n, index)<<endl;
    return 0;
    
}