Update c++.cpp

The standard way a C++ compiler greets us with a Hello World

c/c++.cpp

@@ -1,8 +1,9 @@
 #include <iostream>
-#include <cstdlib>
+
+using namespace std;
 
 int main()
 {
-	std::cout << "Hello World" << std::endl;
-	return EXIT_SUCCESS;
+   cout << "Hello World" << endl; 
+   return 0;
 }