Added binarysearch.java

Author: aroraharsh010

searching/BinarySearch.java

@@ -0,0 +1,45 @@
+package pep5_2Jan;
+
+import java.util.Scanner;
+
+public class BinarySearch {
+
+	public static void main(String[] args) 
+	{
+     Scanner scn=new Scanner(System.in);
+     int N=scn.nextInt();
+	 int[] a=new int[N];
+	 boolean flag=false;
+	 for(int i=0;i<N;i++)
+	 {
+		 a[i]=scn.nextInt();
+	 }
+     int low=0,high=(a.length)-1;
+     int mid;
+    
+     int n=scn.nextInt();
+     while(high>=low)
+     {
+    	 mid=(high+low)/2;
+    	 if (a[mid]>n)
+    	 {
+    		high=mid-1;
+    	 }
+    	 else if (a[mid]<n)
+    	 {
+    		 low=mid+1;
+         }
+    	 else if  (a[mid]==n)
+    		 {System.out.println(mid);
+    		 flag=true;
+    		 break;}
+    	
+     }
+     if (flag==false)
+     {
+    	 System.out.println(-1);
+     }
+         
+	}
+
+}