cpp/cs104/polymorphism/shapes Source

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Property Value

Description
html markup
shown to student

Complete the derived shape classes.
Epilogue
html markup
shown when solved

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

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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 <cmath>
#include <string>
#include <vector>
using namespace std;

class Shape
{
public:
virtual ~Shape() { }
virtual double getArea() = 0;
virtual double getPerimeter() = 0;
virtual string getType() = 0;
};

class RightTriangle : \[ REDACTED ]\
{
public:
RightTriangle(double b, double h)
\[
REDACTED
]\
~RightTriangle() { }
double getArea() { return \[ REDACTED ]\ }
double getPerimeter() { return sqrt(_b*_b + _h*_h) + _h + _b; }
string getType() { return "Right Triangle"; }
private:
\[
REDACTED
]\
};

class Rectangle : \[ REDACTED ]\
{
public:
Rectangle(double b, double h)
\[
REDACTED
]\
~Rectangle() { }
double getArea() { return _b * _h; }
double getPerimeter() { return \[ REDACTED ]\ ; }
string getType() { return "Rectangle"; }
private:
\[
REDACTED
]\
};

class Square : \[ REDACTED ]\
{
public:
Square(double s)
\[
REDACTED
]\
// Override other virtual functions as needed
\[
REDACTED
]\
};

int main()
{
vector<Shape *> shapeList;

int selection = -1;
while(selection != 0){
cout << "Choose an option:" << endl;
cout << "=================" << endl;
cout << "Enter '0' to quit" << endl;
cout << "Enter '1 base height' for a right triangle with given base and height" << endl;
cout << "Enter '2 base height' for a rectangle with given base and height" << endl;
cout << "Enter '3 side' for a square with given side length" << endl;
cout << "> ";
cin >> selection;
// Right Triangle case
if(selection == 1){
double b, h;
cin >> b >> h;
shapeList.push_back(new \[ REDACTED ]\ );
}
// Rectangle case
else if(selection == 2){
double b, h;
cin >> b >> h;
// Add the rest of the code to allocate a new rectangle
// and add it to the shapeList
shapeList.push_back(new \[ REDACTED ]\);
}
// Square case
else if(selection == 3){
double s;
cin >> s;
// Add the rest of the code to allocate a new square
// and add it to the shapeList
shapeList.push_back(new \[ REDACTED ]\ );
}
}
cout << endl;
for (vector<Shape *>::iterator it = shapeList.begin() ;
it != shapeList.end();
++it)
{
Shape *s = *it;
cout << s->getType() << ": Area=" << s->getArea() << " Perim=" << s->getPerimeter() << endl;
delete s;
}
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 [{}]

[{"stdin":"1 2 4\n2 3 4\n3 5\n0"}]
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.*"]

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

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

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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	Complete the derived shape classes.
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	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 <cmath> #include <string> #include <vector> using namespace std; class Shape { public: virtual ~Shape() { } virtual double getArea() = 0; virtual double getPerimeter() = 0; virtual string getType() = 0; }; class RightTriangle : \[ REDACTED ]\ { public: RightTriangle(double b, double h) \[ REDACTED ]\ ~RightTriangle() { } double getArea() { return \[ REDACTED ]\ } double getPerimeter() { return sqrt(_b_b + _h_h) + _h + _b; } string getType() { return "Right Triangle"; } private: \[ REDACTED ]\ }; class Rectangle : \[ REDACTED ]\ { public: Rectangle(double b, double h) \[ REDACTED ]\ ~Rectangle() { } double getArea() { return _b * _h; } double getPerimeter() { return \[ REDACTED ]\ ; } string getType() { return "Rectangle"; } private: \[ REDACTED ]\ }; class Square : \[ REDACTED ]\ { public: Square(double s) \[ REDACTED ]\ // Override other virtual functions as needed \[ REDACTED ]\ }; int main() { vector<Shape > shapeList; int selection = -1; while(selection != 0){ cout << "Choose an option:" << endl; cout << "=================" << endl; cout << "Enter '0' to quit" << endl; cout << "Enter '1 base height' for a right triangle with given base and height" << endl; cout << "Enter '2 base height' for a rectangle with given base and height" << endl; cout << "Enter '3 side' for a square with given side length" << endl; cout << "> "; cin >> selection; // Right Triangle case if(selection == 1){ double b, h; cin >> b >> h; shapeList.push_back(new \[ REDACTED ]\ ); } // Rectangle case else if(selection == 2){ double b, h; cin >> b >> h; // Add the rest of the code to allocate a new rectangle // and add it to the shapeList shapeList.push_back(new \[ REDACTED ]\); } // Square case else if(selection == 3){ double s; cin >> s; // Add the rest of the code to allocate a new square // and add it to the shapeList shapeList.push_back(new \[ REDACTED ]\ ); } } cout << endl; for (vector<Shape >::iterator it = shapeList.begin() ; it != shapeList.end(); ++it) { Shape s = it; cout << s->getType() << ": Area=" << s->getArea() << " Perim=" << s->getPerimeter() << endl; delete s; } 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 `[{}]`	[{"stdin":"1 2 4\n2 3 4\n3 5\n0"}]
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

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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'.