Answer:
cin>>temperature;
Explanation:
This statement in c++ will take the input.The value entered by the user on the screen will be stored in the variable temperature. cin is an standard input method in c++ and is used take input from the screen. It is an object of istream class that is standard input stream .It corresponds to C stream stdin.
Since java.util.PriorityQueue doesn't use the Cloneable interface, I think it's safe to say that Serializable interfaces are implemented in all instances.
C. Until it is emptied is the answer to your question!