what is a binary search algorithm code example
Example 1: binary search
import java.util.Scanner;
public class Binarysearch {
public static void main(String[] args) {
int[] x= {1,2,3,4,5,6,7,8,9,10,16,18,20,21};
Scanner scan=new Scanner(System.in);
System.out.println("enter the key:");
int key=scan.nextInt();
int flag=0;
int low=0;
int high=x.length-1;
int mid=0;
while(low<=high)
{
mid=(low+high)/2;
if(key<x[mid])
{
high=mid-1;
}
else if(key>x[mid])
{
low=mid+1;
}
else if(key==x[mid])
{
flag++;
System.out.println("found at index:"+mid);
break;
}
}
if(flag==0)
{
System.out.println("Not found");
}
}
}
Example 2: 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;
}