cpp/cs104/polymorphism/inh-hier Source

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Property Value

Description
html markup
shown to student

Experiment with where <tt>virtual</tt> is defined in the <tt>print_info</tt> hierarchy.
Epilogue
html markup
shown when solved

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

Copied from problem cpp/cs104/polymorphism/private_inh (author: redekopp@usc.edu)
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;

class Person {
public:
Person(std::string myname, int myid) : name_(myname), id_(myid)
{ }
\[ REDACTED \show: ~Person() ]\ { cout << "~Person" << endl; }
std::string get_name() const { return name_; }
int get_id() const { return id_; }
\[
REDACTED
\show:
void print_info() const
]\
{ cout << "Person: " << name_ << " with ID=" << id_ << endl; }
private:
std::string name_;
int id_;
};

class Student : public Person
{
public:
Student(string n, int ident, double gpa);
~Student() { cout << "~Student "; }
double get_gpa() const { return gpa_; }
\[
REDACTED
\show:
void print_info() const
]\
{
cout << "Student: " << get_name() << " has a gpa of " << gpa_ << endl;
}
private:
double gpa_;
};

\hide[
Student::Student(string n, int ident, double gpa)
: Person(n, ident)
{
gpa_ = gpa;
}
]\

class CSStudent : public Student
{
public:
CSStudent(string n, int ident, double gpa, string favlang);
~CSStudent() { cout << "~CSStudent "; }
string get_lang() const { return favlang_; }
\[
REDACTED
\show:
void print_info() const
]\
{
cout << "CS Student: " << get_name();
cout << " has favorite lang: " << favlang_ << endl;
}
private:
string favlang_;
};

\hide[
CSStudent::CSStudent(string n, int ident, double gpa, string favlang)
: Student(n, ident, gpa)
{
favlang_ = favlang;
}
]\

int main()
{
bool shouldDelete = \[ REDACTED \show: false ]\ ;
Person *p1 = new Student("Tommy", 1234, 3.2);
Person *p2 = new CSStudent("Jill", 5678, 3.7, "c++");
Student *p3 = new CSStudent("Tanya", 9876, 3.5, "!c++");
p1->print_info();
p2->print_info();
p3->print_info();
if(shouldDelete) {
delete p1;
delete p2;
delete p3;
}
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 where <tt>virtual</tt> is defined in the <tt>print_info</tt> hierarchy.
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/cs104/polymorphism/private_inh (author: redekopp@usc.edu) 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; class Person { public: Person(std::string myname, int myid) : name_(myname), id_(myid) { } \[ REDACTED \show: ~Person() ]\ { cout << "~Person" << endl; } std::string get_name() const { return name_; } int get_id() const { return id_; } \[ REDACTED \show: void print_info() const ]\ { cout << "Person: " << name_ << " with ID=" << id_ << endl; } private: std::string name_; int id_; }; class Student : public Person { public: Student(string n, int ident, double gpa); ~Student() { cout << "~Student "; } double get_gpa() const { return gpa_; } \[ REDACTED \show: void print_info() const ]\ { cout << "Student: " << get_name() << " has a gpa of " << gpa_ << endl; } private: double gpa_; }; \hide[ Student::Student(string n, int ident, double gpa) : Person(n, ident) { gpa_ = gpa; } ]\ class CSStudent : public Student { public: CSStudent(string n, int ident, double gpa, string favlang); ~CSStudent() { cout << "~CSStudent "; } string get_lang() const { return favlang_; } \[ REDACTED \show: void print_info() const ]\ { cout << "CS Student: " << get_name(); cout << " has favorite lang: " << favlang_ << endl; } private: string favlang_; }; \hide[ CSStudent::CSStudent(string n, int ident, double gpa, string favlang) : Student(n, ident, gpa) { favlang_ = favlang; } ]\ int main() { bool shouldDelete = \[ REDACTED \show: false ]\ ; Person p1 = new Student("Tommy", 1234, 3.2); Person p2 = new CSStudent("Jill", 5678, 3.7, "c++"); Student *p3 = new CSStudent("Tanya", 9876, 3.5, "!c++"); p1->print_info(); p2->print_info(); p3->print_info(); if(shouldDelete) { delete p1; delete p2; delete p3; } 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:

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