binary search algorithm
#include <bits/stdc++.h>
using namespace std;
int binarySearch(int arr[], int l, int h, int key){
if(l<=h){
int mid = l + (h-l)/2;
if(arr[mid] == key){
return mid;
}
else if(arr[mid] > key){
return binarySearch(arr, l, mid-1, key);
}
else if(arr[mid] < key){
return binarySearch(arr,mid+1, h, key);
}
}
return -1;
}
int main(){
int arr[] = {1,2,3,4,5,6,7,8,9,10};
int n = sizeof(arr)/sizeof(arr[0]);
int key = 7;
int result = binarySearch(arr,0,n-1,key);
(result==-1)
? cout << "Element is not found in the array" << endl
: cout << "Element is found at index " << result;
return 0;
}