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Student Content Assessments

Instrument 21: Encapsulation in C++ Classes Practice Booklet Problem Set 1

Project: Assessing the Feasibility and Impact of Using Online Problem-Solving in Computer Science
Ramapo College of New Jersey

Funding Source: NSF - Undergraduate education (DUE)

Purpose: To evaluate efficacy of an online problem-solving tutor.

Administered To: Students in C++ programming course

Topics Covered:

Content Specific Assessment: C++ programming

Format/Length: 20 close-ended questions

Encapsulation in C++ Classes Practice Booklet
Problem Set 1

Spring 2003


Question 1.

class SchoolClass
{
	public:
		bool difference;
};

void main()
{
	SchoolClass cloneObject;
	cloneObject.difference = true;
	cout << cloneObject.difference;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 2.

class EmployeeClass
{
	public:
		bool rating;
};

void main()
{
	EmployeeClass lastObject;
	cout << lastObject.rating;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 3.

class EmployeeClass
{
	private:
		long double step;
};

void main()
{
	EmployeeClass originalObject;
	originalObject.step = 87.008;
	cout << originalObject.step;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 4.

class AccountClass
{
	public:
		short increment;
		void read();
};

void AccountClass::read()
{
	cout << increment;
}

void main()
{
	AccountClass copyObject;
	copyObject.increment = -57;
	copyObject.read();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 5.

class CompanyClass
{
	public:
		long length;
		void verify();
	protected:
		void redirect();
};

void CompanyClass::verify()
{
	length = -8355;
}

void CompanyClass::redirect()
{
	cout << length;
}

void main()
{
	CompanyClass firstObject;
	firstObject.verify();
	firstObject.redirect();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 6.

class AccountClass
{
	protected:
		short balance;
};

void main()
{
	AccountClass cloneObject;
	cloneObject.balance = -93;
	cout << cloneObject.balance;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 7.

class CompanyClass
{
	public:
		void verify();
		void filter();
	private:
		bool depth;
};

void CompanyClass::verify()
{
	depth = true;
}

void CompanyClass::filter()
{
	cout << depth;
}

void main()
{
	CompanyClass copyObject;
	copyObject.verify();
	copyObject.filter();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 8.

class BrandClass
{
	public:
		void project();
	private:
		long double number;
};

void BrandClass::project()
{
	cout << number;
}

void main()
{
	BrandClass lastObject;
	lastObject.project();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 9.

class ServiceClass
{
	public:
		long part;
	private:
		void join();
};

void ServiceClass::join()
{
	cout << part;
}

void main()
{
	ServiceClass lastObject;
	lastObject.part = 5514;
	lastObject.join();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 10.

class BrandClass
{
	public:
		char volume;
		void compute();
		void input();
	protected:
		char units;
	private:
		char weight;
};

void BrandClass::compute()
{
	volume = 'R';
	units = 'v';
	weight = '9';
}

void BrandClass::input()
{
	cout << volume;
	cout << units;
	cout << weight;
}

void main()
{
	BrandClass lastObject;
	lastObject.compute();
	lastObject.input();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 11.

class SchoolClass
{
	public:
		long step;
		void redirect();
		void invert();
	protected:
		long length;
	private:
		long duration;
};

void SchoolClass::redirect()
{
	length = 4586;
	cout << length;
}

void SchoolClass::invert()
{
	cout << duration;
}

void main()
{
	SchoolClass cloneObject;
	cloneObject.step = -4018;
	cloneObject.redirect();
	cloneObject.invert();
	cout << cloneObject.step;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 12.

class BrandClass
{
	public:
		char step;
		void verify();
	protected:
		char status;
	private:
		void threshold();
		char number;
};

void BrandClass::verify()
{
	number = 'E';
	step = 'q';
}

void BrandClass::threshold()
{
	cout << step;
}

void main()
{
	BrandClass lastObject;
	lastObject.step = '%';
	lastObject.verify();
	lastObject.threshold();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 13.

class CompanyClass
{
	public:
		void select();
		void transform();
		int length;
	protected:
		int id;
	private:
		int volume;
};

void CompanyClass::select()
{
	id = 897;
	volume = -441;
}

void CompanyClass::transform()
{
	cout << volume;
}

void main()
{
	CompanyClass lastObject;
	lastObject.length = 368;
	lastObject.select();
	lastObject.transform();
	cout << lastObject.id;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 14.

class StudentClass
{
	public:
		void select();
		void redirect();
	protected:
		long number;
};

void StudentClass::select()
{
	number = 1049;
}

void StudentClass::redirect()
{
	cout << number;
}

void main()
{
	StudentClass newObject;
	newObject.select();
	newObject.redirect();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 15.

class BrandClass
{
	public:
		void calculate();
		int duration;
	protected:
		int count;
	private:
		int index;
};

void BrandClass::calculate()
{
	index = -224;
	count = -584;
}

void main()
{
	BrandClass duplicateObject;
	duplicateObject.duration = 532;
	duplicateObject.calculate();
	cout << duplicateObject.duration;
	cout << duplicateObject.index;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 16.

class StudentClass
{
	public:
		long double step;
		void filter();
		void convert();
	protected:
		long double duration;
	private:
		long double count;
};

void StudentClass::filter()
{
	duration = -29.931;
	count = -3.753;
}

void StudentClass::convert()
{
	cout << duration;
	cout << count;

void main()
{
	StudentClass originalObject;
	originalObject.filter();
	originalObject.convert();
	cout << originalObject.step;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 17.

class BrandClass
{
	public:
		short area;
		void reorder();
	protected:
		void output();
		short count;
	private:
		short part;
};

void BrandClass::reorder()
{
	part = 84;
	count = -38;
	area = -2;
	cout << part;
}

void main()
{
	BrandClass specialObject;
	specialObject.reorder();
	specialObject.output();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 18.

class SchoolClass
{
	public:
		float principal;
};

void main()
{
	SchoolClass cloneObject;
	cout << cloneObject.principal;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 19.

class StudentClass
{
	public:
		void transform();
		void reorder();
	private:
		bool limit;
};

void StudentClass::transform()
{
	limit = true;
}

void StudentClass::reorder()
{
		cout << limit;
}

void main()
{
	StudentClass specialObject;
	specialObject.transform();
	specialObject.reorder();
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error


Question 20.

class StudentClass
{
	public:
		void transform();
		int volume;
	protected:
		int index;
	private:
		int count;
};

void StudentClass::transform()
{
	count = 451;
	index = 352;
}

void main()
{
	StudentClass cloneObject;
	cloneObject.volume = 822;
	cloneObject.transform();
	cout << cloneObject.volume;
	cout << cloneObject.count;
}


Check all that apply to the above code:


	Accessing private variable		Accessing protected variable
	Accessing private function		Accessing protected function
	Code OK		Semantic Error

Problem Set 1: Answers to Odd-Numbered Questions

Question 1.	Code OK
Question 3.	Syntax Error: Accessing private variable
Question 5.	Syntax Error: Accessing protected function
Question 7.	Code OK
Question 9.	Syntax Error: Accessing private function
Question 11.	Semantic Error
Question 13.	Syntax Error: Accessing protected variable
Question 15.	Syntax Error: Accessing private variable
Question 17.	Syntax Error: Accessing protected function
Question 19.	Code OK


Problem Set 1: Answers to Even-Numbered Questions

Question 2.	Semantic Error
Question 4.	Code OK
Question 6.	Syntax Error: Accessing protected variable
Question 8.	Semantic Error
Question 10.	Code OK
Question 12.	Syntax Error: Accessing private function
Question 14.	Code OK
Question 16.	Semantic Error
Question 18.	Semantic Error
Question 20.	Syntax Error: Accessing private variable

Curriculum Development Instruments

Student Content Assessments

Encapsulation in C++ Classes Practice BookletProblem Set 1

Spring 2003

Encapsulation in C++ Classes Practice Booklet
Problem Set 1