C++ code added.

binary-search/binarysearch.cpp

@@ -0,0 +1,40 @@
+// C++ program to implement recursive Binary Search 
+#include <iostream> 
+using namespace std; 
+
+// A iterative binary search function. It returns 
+// location of x in given array arr[l..r] if present, 
+// otherwise -1 
+int binarySearch(int arr[], int l, int r, int x) 
+{ 
+    while (l <= r) { 
+        int m = l + (r - l) / 2; 
+
+        // Check if x is present at mid 
+        if (arr[m] == x) 
+            return m; 
+
+        // If x greater, ignore left half 
+        if (arr[m] < x) 
+            l = m + 1; 
+
+        // If x is smaller, ignore right half 
+        else
+            r = m - 1; 
+    } 
+
+    // if we reach here, then element was 
+    // not present 
+    return -1; 
+} 
+
+int main(void) 
+{ 
+    int arr[] = { 2, 3, 4, 10, 40 }; 
+    int x = 10; 
+    int n = sizeof(arr) / sizeof(arr[0]); 
+    int result = binarySearch(arr, 0, n - 1, x); 
+    (result == -1) ? cout << "Element is not present in array"
+                   : cout << "Element is present at index " << result; 
+    return 0; 
+}