day 29

day29/Java/binarySearch.java

@@ -0,0 +1,45 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javaapplication3;
+
+/**
+ * @date 29/01/19
+ * @author SPREEHA DUTTA
+ */
+import java.util.*;
+public class binarySearch {
+    public static int search(int []arr,int p,int l,int r)
+    {
+        int mid=0;
+        if(r>=l)
+        {
+          mid=(l+r)/2;  
+        if(p==arr[mid])
+            return mid;
+        else if(p>arr[mid])
+            return search(arr,p,mid+1,r);
+        else
+            return search(arr,p,l,mid-1);
+        }
+        return -1;
+    }
+    public static void main(String []args)
+    {
+        Scanner sc=new Scanner(System.in);
+        int n,i;int p,f;
+        n=sc.nextInt();
+        int arr[]=new int[n];
+        for(i=0;i<n;i++)
+            arr[i]=sc.nextInt();
+        System.out.println("Enter element to be searched");
+        p=sc.nextInt();
+        f=search(arr,p,0,arr.length-1);
+        if(f==-1)
+            System.out.println("undefined");
+        else
+            System.out.println(f);
+    }
+}

day29/README.md

@@ -45,6 +45,51 @@ console.log (binarySearch ([1, 2, 3, 4, 5, 8, 9], 8));
 console.log (binarySearch ([1, 2, 3, 4, 5, 8, 9], 7));
 ```
 
+## Java Implementation
+
+### [Solution](./Java/binarySearch.java)
+
+```java
+/**
+ * @date 29/01/19
+ * @author SPREEHA DUTTA
+ */
+import java.util.*;
+public class binarySearch {
+    public static int search(int []arr,int p,int l,int r)
+    {
+        int mid=0;
+        if(r>=l)
+        {
+          mid=(l+r)/2;  
+        if(p==arr[mid])
+            return mid;
+        else if(p>arr[mid])
+            return search(arr,p,mid+1,r);
+        else
+            return search(arr,p,l,mid-1);
+        }
+        return -1;
+    }
+    public static void main(String []args)
+    {
+        Scanner sc=new Scanner(System.in);
+        int n,i;int p,f;
+        n=sc.nextInt();
+        int arr[]=new int[n];
+        for(i=0;i<n;i++)
+            arr[i]=sc.nextInt();
+        System.out.println("Enter element to be searched");
+        p=sc.nextInt();
+        f=search(arr,p,0,arr.length-1);
+        if(f==-1)
+            System.out.println("undefined");
+        else
+            System.out.println(f);
+    }
+}
+```
+
 ## C++ Implementation
 
 ### [Solution by @imkaka](./C++/binary_search.cpp)
@@ -106,4 +151,4 @@ int main(){
     cout << "Recursive: " << binary_search_rec(arr, 0, size-1, val) << endl;
     return 0;
 }
-```
+```