Question
Define a Pet class that stores the pet’s name, age, and weight. Add appropriate constructors, accessor functions, and mutator functions. Also define a function named getLifespan that returns a string with the value “unknown lifespan.”
Next, define a Dog class that is derived from Pet . The Dog class should have a private member variable named breed that stores the breed of the dog. Add mutator and accessor functions for the breed variable and appropriate constructors. Redefine the getLifespan function to return “Approximately 7 years” if the dog’s weight is over 100 pounds and “Approximately 13 years” if the dog's weight is under 100 pounds.
Next, define a Rock class that is derived from Pet . Redefine the getLifespan function to return “Thousands of years”.
Finally, write a test program that creates instances of pet rocks and pet dogs that exercise the inherited and redefined functions.
Answer
PROGRAM CODE:
//Header file section
#include <iostream>
#include <string>
using namespace std;
class Pet {
protected:
string name;
int age;
double weight;
public:
// Constructors
Pet() : age(0), weight(0.0) {}
Pet(const string& name, int age, double weight) : name(name), age(age), weight(weight) {}
// Accessor functions
string getName() const {
return name;
}
int getAge() const {
return age;
}
double getWeight() const {
return weight;
}
// Mutator functions
void setName(const string& new_name) {
name = new_name;
}
void setAge(int new_age) {
age = new_age;
}
void setWeight(double new_weight) {
weight = new_weight;
}
// Function to get the lifespan (default value)
virtual string getLifespan() const {
return "Unknown lifespan.";
}
};
class Dog : public Pet {
private:
string breed;
public:
// Constructors
Dog() : Pet(), breed("Unknown breed") {}
Dog(const string& name, int age, double weight, const string& breed)
: Pet(name, age, weight), breed(breed) {}
// Accessor function for breed
string getBreed() const {
return breed;
}
// Mutator function for breed
void setBreed(const string& new_breed) {
breed = new_breed;
}
// Redefined function to get the lifespan based on weight
string getLifespan() const override {
if (weight > 100) {
return "Approximately 7 years.";
} else {
return "Approximately 13 years.";
}
}
};
class Rock : public Pet {
public:
// Redefined function to get the lifespan for a rock
string getLifespan() const override {
return "Thousands of years.";
}
};
int main() {
Dog dog1("Rover", 5, 80.5, "Labrador");
Dog dog2("Max", 3, 120.0, "Saint Bernard");
Rock rock1("Rocky", 1000, 1.5);
Rock rock2("Pebbles", 2000, 2.0);
// Display dog information
cout << "Dog 1 - Name: " << dog1.getName() << ", Age: " << dog1.getAge()
<< ", Weight: " << dog1.getWeight() << " lbs, Breed: " << dog1.getBreed()
<< ", Lifespan: " << dog1.getLifespan() << endl;
cout << "Dog 2 - Name: " << dog2.getName() << ", Age: " << dog2.getAge()
<< ", Weight: " << dog2.getWeight() << " lbs, Breed: " << dog2.getBreed()
<< ", Lifespan: " << dog2.getLifespan() << endl;
// Display rock information
cout << "Rock 1 - Name: " << rock1.getName() << ", Age: " << rock1.getAge()
<< ", Weight: " << rock1.getWeight() << " lbs, Lifespan: " << rock1.getLifespan() << endl;
cout << "Rock 2 - Name: " << rock2.getName
OUTPUT:
Dog 1 - Name: Rover, Age: 5, Weight: 80.5 lbs, Breed: Labrador, Lifespan: Approximately 13 years.
Dog 2 - Name: Max, Age: 3, Weight: 120 lbs, Breed: Saint Bernard, Lifespan: Approximately 7 years.
Rock 1 - Name: Rocky, Age: 1000, Weight: 1.5 lbs, Lifespan: Thousands of years.
Rock 2 - Name: Pebbles, Age: 2000, Weight: 2 lbs, Lifespan: Thousands of years.