added binary search algo in binarySearchkunal.java

binarySearchKunal.java

@@ -0,0 +1,32 @@
+public class binarySearchKunal {
+
+    public static void main(String[] args) {
+
+        int[] a = {12, 22, 33, 45, 89,103,232,345};
+        System.out.println(bs(a, 22));
+
+    }
+
+    // dekh kya kya variable change ho rhe or kaise kaise change ho rhe.. us change ko samne likh or
+    //banata jaa prog
+    private static int bs(int[] a, int target) {
+
+        int start=0;
+        int end= a.length-1;
+
+        while(start<=end){
+           int mid = start + (end-start)/2;
+
+            if(target < a[mid]){
+                end=mid-1;
+            }
+            else if(target > a[mid]){
+                start = mid +1;
+            }
+            else {
+                return mid;
+            }
+        }
+      return -1;
+    }
+}