Question: PLEASE, EXPLAIN CLEARLY YOUR ANSWERS (CLASSES & INHERITANCE C++) CLASSES & INHERITANCE QUESTIONS (I HAVE THE ANSWERS, I NEED CLEAR EXPLANIANTION) 1)What is the output
PLEASE, EXPLAIN CLEARLY YOUR ANSWERS (CLASSES & INHERITANCE C++)
CLASSES & INHERITANCE QUESTIONS (I HAVE THE ANSWERS, I NEED CLEAR EXPLANIANTION)
1)What is the output of the following code snippet?
class Car
{
public:
Car(double speed);
void start();
void accelerate(double speed);
void stop();
double get_speed() const;
private:
double speed;
};
Car::Car(double speed)
{
this->speed = speed;
}
void Car::start()
{
speed = 1;
}
void Car::accelerate(double speed)
{
this->speed = this->speed + speed;
}
void Car::stop()
{
speed = 0;
}
double Car::get_speed() const
{
return speed;
}
int main()
{
Car* c1 = new Car(90);
c1->start();
c1->accelerate(90);
cout << "Speed: " << c1->get_speed() << endl;
c1->stop();
return 0;
}
A)Speed: 1
B)Speed: 90
C)Speed: 91
D)There is no output because the code snippet does not compile.
Ans: C
Study the following code snippet:
class Car
{
public:
Car();
Car(double new_speed);
double get_speed() const;
private:
double speed;
};
Car::Car()
{
speed = 0;
}
Car::Car(double new_speed)
{
speed = new_speed;
}
double Car::get_speed()
{
return speed;
}
class AeroCar : public Car
{
public:
AeroCar();
AeroCar(double new_height, double new_speed);
void display_data() const;
private:
double height;
};
AeroCar::AeroCar()
{
height = 0;
}
AeroCar::AeroCar(double new_height, double new_speed) : Car(new_speed)
{
height = new_height;
}
void AeroCar::display_data() const
{
cout << Car::get_speed() << height << endl;
}
int main()
{
Car c1;
Car c2(10);
AeroCar ac1(20, 10);
c1 = ac1;
return 0;
}
Which one of the following statements is false?
A)ac1 data is sliced away.
B)ac1.height = 20.
C)c1.speed = 10.
D)c1.height = 20.
Ans: D
What is the output of the following code snippet?
class Question
{
public:
Question();
void set_text(string new_text);
void set_answer(string new_answer);
void display() const;
private:
string text;
string answer;
};
Question::Question()
{
text = "";
answer = "";
}
void Question::set_text(string new_text)
{
text = new_text;
}
void Question::set_answer(string new_answer)
{
answer = new_answer;
}
void Question::display() const
{
cout << "Question: " << text << endl;
cout << "Answer: " << answer << endl;
}
class ChoiceQuestion : public Question
{
public:
ChoiceQuestion();
void set_text(string new_text);
void set_answer(string new_answer);
void display() const;
};
ChoiceQuestion::ChoiceQuestion()
: Question()
{}
void ChoiceQuestion::set_text(string new_text)
{
Question::set_text(new_text);
}
void ChoiceQuestion::set_answer(string new_answer)
{
Question::set_answer(new_answer);
}
void ChoiceQuestion::display() const
{
Question::display();
}
int main()
{
Question* q1 = new Question;
q1->set_text("What is C++?");
ChoiceQuestion* cq1 = q1;
cq1->set_answer("A Mine Field among Programming Languages!");
cq1->display();
return 0;
}
A)Question: What is C++
Answer: A Mine Field among Programming Languages!
B)Question:
Answer: A Mine Field among Programming Languages!
C)Question: What is C++
Answer:
D)There is no output due to a compilation error because a base-class object is assigned to a derived class object variable, which is not allowed.
Ans: D
What is the output of the following code snippet?
class Question
{
public:
Question();
void set_text(string new_text);
void set_answer(string new_answer);
void display() const;
private:
string text;
string answer;
};
Question::Question()
{
text = "";
answer = "";
}
void Question::set_text(string new_text)
{
text = new_text;
}
void Question::set_answer(string new_answer)
{
answer = new_answer;
}
void Question::display() const
{
cout << "Question: " << text << endl;
cout << "Answer: " << answer << endl;
}
class ChoiceQuestion : public Question
{
public:
void add_choice(string choice, bool correct);
private:
vector
};
void ChoiceQuestion::add_choice(string choice, bool correct)
{
...
}
int main()
{
Question* q1 = new Question;
q1->set_text("What is C++?");
ChoiceQuestion* cq1 = new ChoiceQuestion;
cq1->set_answer("A Mine Field among Programming Languages!");
cq1->add_choice("C++ is a simple programming language.", false);
q1 = cq1;
q1->display();
return 0;
}
A)Question: What is C++?
Answer: A Mine Field among Programming Languages!
B)Question:
Answer: A Mine Field among Programming Languages!
C)Question: What is C++?
Answer:
D)There is no output due to compilation errors.
Ans: B
Consider the following code snippet:
class Employee
{
public:
Employee();
Employee(string new_name, double new_salary);
void set_name(string new_name);
virtual void set_salary(double new_salary);
string get_name() const;
double get_salary() const;
private:
string name;
double salary;
};
void Employee::set_salary(double new_salary)
{
salary = new_salary;
}
class Manager : public Employee
{
public:
Manager();
Manager(double new_bonus);
Manager(string new_name, double new_salary, double new_bonus);
void set_salary(double new_salary);
void set_bonus(double new_bonus);
void print_data() const;
private:
double bonus;
};
void Manager::set_salary(double new_salary)
{
Employee::set_salary(new_salary * 2);
}
class Officer : public Employee
{
public:
Officer();
Officer(string new_name, double new_salary, double new_bonus);
void set_bonus(double new_bonus);
void print_data() const;
private:
double bonus;
};
int main()
{
Employee* emp = new Employee;
Officer* officer = new Officer;
emp = officer;
emp->set_salary(100);
return 0;
}
Which of the following functions is called by the "emp->set_salary(100);" statement?
A)void Employee::set_salary(double new_salary);
B)void Manager::set_salary(double new_salary);
C)void Officer::set_salary(double new_salary);
D)None of the listed items.
Ans: A
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