Question

A hard c++ problem

◎Write a c++ program”Student.h”include

Private data member,

string firstName;

string lastName;

double GPA(=(4.0*NumberOfAs+3.0*NumberOfBs+2.0*NumberOfCs+1.0*NumberOfDs)/(

As+Bs+Cs+Ds+Fs));

Public data member,

void setFirstName(string name);

string getFirstName() const;

void printFirstName() const;

void getLastName(string name);

string getLastName() const;

void printLastName() const;

void computeGPA(int NumberOfAs,int NumberOfBs,int NumberOfCs,int NumberOfDs,int NumberOfFs);

double getGPA() const;

double printGPA() const;

A destructor and an explicit default constructor initializing GPA=0.0 and checking if GPA>=0.0 by try{}catch{}.

Add member function,

bool operator<(const Student);

The comparison in this function based on the GPAs of two student objects.

◎Implement the Student class in”Student.cpp”

◎Write a test program “StudentTest.cpp”to test member functions and create two student obgects,student1 and student2,compute two students’ GPAs,and show the name of the student name with a higher GPA.

Answer 1

Student.h:

#ifndef STUDENT_H
#define STUDENT_H
#include <iostream>
using namespace std;

class Student
{
private:

    string firstName;

    string lastName;

    double GPA;

public:

    Student(int NumberOfAs,int NumberOfBs,int NumberOfCs,int NumberOfDs,int NumberOfFs)
    {
        computeGPA(NumberOfAs, NumberOfBs, NumberOfCs, NumberOfDs,NumberOfFs);
        GPA = getGPA();
        if (GPA<0)
        {
            cout << "An invalid GPA has been detected. " <<endl;
            GPA = 0.0;
        }
    }

    ~Student()
    {
    }

    void setFirstName(string name)
    {
        firstName = name;
    }

    string getFirstName() const
    {
        return firstName;
    }

    void printFirstName() const
    {
        cout<<"First Name: "<<firstName<<endl;
    }

    void getLastName(string name)
    {
        lastName = name;
    }

    string getLastName() const
    {
        return lastName;
    }

    void printLastName() const
    {
        cout<<"Last Name: "<<lastName<<endl;
    }

    void computeGPA(int NumberOfAs,int NumberOfBs,int NumberOfCs,int NumberOfDs,int NumberOfFs)
    {
        GPA = (4.0*NumberOfAs+3.0*NumberOfBs+2.0*NumberOfCs+1.0*NumberOfDs)/(NumberOfAs+NumberOfBs+NumberOfCs+NumberOfDs+NumberOfFs);
    }
    double getGPA() const
    {
        return GPA;
    }
    double printGPA() const
    {
        cout<<"GPA of "<<getFirstName()<<" "<<getLastName()<<" is: "<<getGPA()<<endl;
    }
    bool operator <(const Student& S2) {
        if(GPA < S2.GPA) {
            return true;
        }
        return false;
    }
};
#endif

StudentTest.cpp:

#include <iostream>
#include "Student.h"

using namespace std;

int main()
{
    
   Student S1(2,3,4,5,0);

   Student S2(3,2,5,4,0);
   S1.setFirstName("Vishnu");
   S1.setLastName("Koduri");
   S2.setFirstName("Shyam");
   S2.setLastName("Sankar");
   S1.printGPA();
   S2.printGPA();
   if( S1 < S2 ) {
      cout << "S1 is less than S2 " << endl;
   } else {
      cout << "S2 is less than S1 " << endl;
   }
    return 0;
}

Output: