Lab for CS112 Data Structures and Algorithms

Question

Answer this and please explain so that it is easy to understand the following questions and the explanation given.



Implement a base class Person. Derive classes Student and Instructor from Person. A person has a name and a birthday. A student has a major, and an instructor has a salary. Write the class definitions, the constructors, and the member functions display for all classes.

Answer 1

using namespace std;

#include <iostream>

#include <iomanip>

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#define NAME_LENGTH (255)

typedef

class Person

{

protected:

char name[NAME_LENGTH];

char birthday[3]; // M-D-Y Ex. 3 4 5 is March 4 2005

public:

Person( char * nameStr, char * bday)

{

memset(name,0,NAME_LENGTH);

memset(birthday,0,3);

strncpy(name,nameStr,NAME_LENGTH);

strncpy(birthday,bday,3);

}

void GetName( char * nameStr) { strncpy(nameStr,name,NAME_LENGTH); }

void GetBirthday( char * bday) { strncpy(bday,birthday,3); }

~Person()

{

memset(name,0,NAME_LENGTH);

memset(birthday,0,3);

}

Person( Person & person)

{

memset(this->name,0,NAME_LENGTH);

memset(this->birthday,0,3);

person.GetName(this->name);

person.GetBirthday(this->birthday);

}

} * TPerson;

#define PERSON_SIZE ( sizeof(Person))

#define STUDENT_MAJOR_LENGTH (55)

typedef

class Student : public Person

{

protected:

char major[STUDENT_MAJOR_LENGTH];

public:

Student( char * strName, char * bday, char * strMajor) : Person(strName,bday)

{

memset(major,0,STUDENT_MAJOR_LENGTH);

strncpy(major,strMajor,STUDENT_MAJOR_LENGTH);

}

void GetMajor( char * strMajor) { strncpy(strMajor,major,STUDENT_MAJOR_LENGTH ); }

void SetMajor( char * strMajor) { strncpy(major,strMajor,STUDENT_MAJOR_LENGTH ); }

~Student()

{

memset(major,0,STUDENT_MAJOR_LENGTH);

}

} * TStudent;

#define STUDENT_SIZE (sizeof(Student))

typedef

class Instructor : public Person

{

protected:

double salary;

public:

Instructor (char * strName, char * bday, double Salary) : Person(strName,bday)

{

salary = Salary;

}

double GetSalary() { return(salary); }

void SetSalary( double Salary) { salary = Salary; }

~Instructor()

{

salary=0;

}

} * TInstructor;

#define INSTRUCTOR_SIZE (sizeof(Instructor))

int main()

{

char dateBuff[3];

char nameBuff[NAME_LENGTH];

char major[STUDENT_MAJOR_LENGTH];

double salary;

Student student((char*)"Shanil P.",(char*)"IDK",(char*)"Unknown");

dateBuff[0]=2; dateBuff[1]=11; dateBuff[2]=70;

Instructor instructor((char*)"Patrick Baldwin",dateBuff,49735.42f);

student.GetName(nameBuff);

cout << " Student Name :>" << nameBuff << "<" << endl;

student.GetBirthday(dateBuff);

cout << "Student Birthday >" << dateBuff << "< " << endl;

student.GetMajor(major);

cout << "Student Major >" << major << "<" << endl;

instructor.GetName(nameBuff);

cout << " Instructor Name :>" << nameBuff << "<" << endl;

instructor.GetBirthday(dateBuff);

for (int iLoop=0; iLoop<3; iLoop++) { cout << (int) dateBuff[iLoop] << " "; }

cout << endl;

cout << " Instructor salarhy " << fixed << setprecision(2) << instructor.GetSalary() << endl;

}