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1. The following questions can be answered with a single word or a short sentence. (a) How do you declare the return type of a function that does not return a value? (b) Can you modify the size of a C-array, word, that was defined as char word[10]; later on? (c) What is the difference between istream and ostream? (d) How can you turn a class into an abstract class? (e) When do you use the keyword friend in the context of overloading of binary operators? (f) How and where do you declare that a class inherits from another class? (8) Write down an example showing how you can specify a default argument for an input parameter, e.g., when declaring a constructor. (h) When declaring a member function, which keyword do you have to use to make sure that the function cannot modify the member values of the object on which the member function is called