- [4 points] What is a namespace and what problems do namespaces solve when implementing a large project?
- [6 points] Name or describe three methods by which class member data can be initialized. When, if ever, is the use of one of these methods preferred or required.
- Friends and Encapsulation
- [2 points] What is a
friend function?
- [4 points] Provide an argument against employing friend functions liberally when implementing classes.
- Class Members
- [3 points] Describe the unique properties of static member functions.
- [3 points] Describe the unique properties of static member data.
- [4 points] The operator [] can be overloaded in two ways. Describe each. Describe the difference between the two routines.
- [5 points] What will be the result of executing the following code. There are no intentional syntax errors. Assume all member functions are correctly implemented elsewhere.
class PersonT {
public:
PersonT()=default;
void SetName(string s);
void SetAge(int i);
string GetName();
int GetAge();
private:
int age;
string name;
};
PersonT & PersonFactory() {
PersonT data;
data.SetName("Unknown");
data.SetAge(0);
return data;
}
int main() {
PersonT & person = PersonFactory();
cout << person.GetName() << " is " << person.GetAge() << endl;
return 0;
}
- Consider the following code
class Base {
public:
Base()=default;
virtual ~Base()=default;
void PrintClass() { cout << data;}
void SetData(int d) {data = d;}
private:
int data;
};
class Derived: public Base {
public:
void PrintClass();
void SetData(int d){Base::SetData(d);}
void ChangeData(int d) {data = d;}
};
int main() {
Base * item = new Derived;
item->ChangeData(x);
item->PrintClass();
return 0;
}
- [4 points] There are two non-syntax reasons that this code will not compile. What are they? (Identify the line where the error occurs and describe the error)
- [4 points] How can each error be corrected.
- [5 points] Describe the problem caused by the following code. How can this problem be corrected? (Again, there are no intentional syntax errors)
class Base {
public:
virtual ~Base() = default;
...
private:
int baseData[MAX_DATA_SIZE];
};
class Derived1: public Base {
...
};
class Derived2: public Base {
...
};
class Mixed: public Derived1, public Derived2 {
...
};
- [6 points] Provide the code for a templated function
Mode that takes a vector of elements and returns the item occurring most frequently. If multiple items occur with equal maximum frequency, return the one with the minimum value.