Your question is a bit vague about what you are actually thinking about doing. "Cloud computing" can mean almost anything. If you're looking for languages with specific cloud computing advantages, Java has several because it's a compiled language that compiles to operating-system independent byte code.
I also chime in with the others about C++ being a low-level language. Yes, it is. But you're always going to have more than just the C++ language. If you separate both Java and C++ from the classes that come with them, Java and C++ are extremely similar. You have to adopt some rigid criterion like "pointers = low-level, garbage collection = high-level" to make the distinction stick. (And, of course, you can make pointers smart and invisible in C++ and you can use garbage collection in C++ too if you want to.)