Question

6) Given that the following two function calls exist together in a single program -- which compiles and runs successfully, explain how the compiler can distinguish what function to call in each case. (Hint: There are at least two possible explanations...) 

func(a, b, c); 

func(a, b); 

7) Write a function which will read in a phone number from the user and return it to the caller. The caller is expected to prompt the user before calling your function. The core code is given, just fill in your function around it. (Hint: Whal values should be arguments and which ones should be local variables?) (Hint 2: What kind of argument passing mechanism should you use?) (Thought-provoker: Why should your function not prompt [literally for the phone number?) (Thought-provoker 2: Could your function prompt and avoid the problem(s) this causes?)

 cin >> area >> t >> exchange >> t >> line; 

Answer 1

6. The compiler can resolve the call by determining the number of parameters required for method call. It is known as method overloading.

7.

// As the method is supposed to return multiple values, hence we should
// be taking the parameters by their references and fill their values.
// We need not provide a prompt, as caller has already done so.
void readPhone(int &area, int &exchange, int &line) {
   cin >> area;
   cin >> exchange;
   cin >> line;
}