cpp/cs104/polymorphism/private

Viewing cpp/cs104/polymorphism/private_inh by redekopp@usc.edu. You have unsaved changes. Log in above to create, edit, preview and publish Websheets.

Property Value

Description
html markup
shown to student

Experiment with public vs. private inheritance and polymorphism

Epilogue
html markup
shown when solved

remove
Public permissions remove
Remarks
Comments, history, license, etc.

Copied from problem cpp/cs104/inheritance/public_private_inh (author: redekopp@usc.edu)
Copied from problem cpp/cs104/inheritance/person_stu_ex (author: redekopp@usc.edu)

remove
Engine
Choices
json list of string, bool pairs
e.g. [["good", true], ["bad", false]]

Correct answer
Template / Reference solution

Template / Reference solution

#include <iostream>
#include <string>
using namespace std;

enum {CS=0, CECS, CSBA, EE};
class Person {
public:
Person() : name_(), id_(0)
{ }
Person(std::string myname, int myid) : name_(myname), id_(myid)
{ }
~Person() {}
std::string get_name() const { return name_; }
int get_id() const { return id_; }
virtual void print_info() const
{ cout << name_ << " with ID=" << id_ << endl; }
private:
std::string name_;
int id_;
};

// Change from public to private and see the effect
class Student : \[ REDACTED ]\ Person
{
public:
Student() {} // we should initialize members
// but let's not worry about this
Student(string n, int ident, int mjr);
int get_major() const { return major_; }
double get_gpa() const { return gpa_; }
void print_info() const
{
// Experiment accessing Person::name_ or Person::get_name()
// based on public/private inheritance
cout << get_name() << " has a gpa of " << gpa_ << endl;
}
private:
int major_;
double gpa_;
};

\hide[
Student::Student(string n, int ident, int mjr)
: Person(n, ident)
{
major_ = mjr;
gpa_ = 3.7;
}
]\

int main()
{
\[ REDACTED ]\ = new Student("Tommy", 53221, CECS);
\[ REDACTED ]\->print_info();
return 0;
}

Java test suite
See manual

C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]
to just run once with no input use [{}]

[{}]
C++ test suite
See manual

Forbidden substrings
json list of strings
e.g. ["for","while"]

remove
Solution visibility remove
Java imports
json list of importables
e.g. ["java.util.*"]

remove
Override Java classname
else defaults to
websheet name
remove
Dependent on other websheets?
json list of websheet names in this folder
e.g. ["DataStructure"]

remove
Is example?
i.e., just a demo
remove
Add compiler flag(s)
json list of flags
e.g. ["-Wno-unused-variable"]

remove
Remove default compiler flag(s)
json list of flags
see default_cppflags
e.g. ["-Wno-write-strings"]

remove

Property	Value
Description html markup shown to student	Experiment with public vs. private inheritance and polymorphism
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/cs104/inheritance/public_private_inh (author: redekopp@usc.edu) Copied from problem cpp/cs104/inheritance/person_stu_ex (author: redekopp@usc.edu) remove
Engine
Choices json list of string, bool pairs e.g. `[["good", true], ["bad", false]]`
Correct answer
Template / Reference solution
Template / Reference solution	#include <iostream> #include <string> using namespace std; enum {CS=0, CECS, CSBA, EE}; class Person { public: Person() : name_(), id_(0) { } Person(std::string myname, int myid) : name_(myname), id_(myid) { } ~Person() {} std::string get_name() const { return name_; } int get_id() const { return id_; } virtual void print_info() const { cout << name_ << " with ID=" << id_ << endl; } private: std::string name_; int id_; }; // Change from public to private and see the effect class Student : \[ REDACTED ]\ Person { public: Student() {} // we should initialize members // but let's not worry about this Student(string n, int ident, int mjr); int get_major() const { return major_; } double get_gpa() const { return gpa_; } void print_info() const { // Experiment accessing Person::name_ or Person::get_name() // based on public/private inheritance cout << get_name() << " has a gpa of " << gpa_ << endl; } private: int major_; double gpa_; }; \hide[ Student::Student(string n, int ident, int mjr) : Person(n, ident) { major_ = mjr; gpa_ = 3.7; } ]\ int main() { \[ REDACTED ]\ = new Student("Tommy", 53221, CECS); \[ REDACTED ]\->print_info(); return 0; }
Java test suite See manual
C++ test suite json list of stdin/args tests e.g. `[{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]` to just run once with no input use `[{}]`	[{}]
C++ test suite See manual
Forbidden substrings json list of strings e.g. `["for","while"]`	remove
Solution visibility	remove
Java imports json list of importables e.g. `["java.util.*"]`	remove
Override Java classname else defaults to websheet name	remove
Dependent on other websheets? json list of websheet names in this folder e.g. `["DataStructure"]`	remove
Is example? i.e., just a demo	remove
Add compiler flag(s) json list of flags e.g. `["-Wno-unused-variable"]`	remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. `["-Wno-write-strings"]`	remove

Optional properties:

Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.