P5.2 Given the following student class interface, a) implement all member functi

Question

P5.2 Given the following student class interface, a) implement all member functions of the class, b) implement all non-member external functions of the class, and c) write a main() function to generate an output similar to the sample output appeared after the class interface. Notice that not all pre- and post-conditions for functions are provided; some are intentionally left out for you to fill in.

#include <iostream>

#include <string>

#include <iomanip>

using namespace std;

class student

{

public:

   student();

   student(string, int, double);

   string getName();

   // "Accessor" or "accessor function"

        // Postcondition: returns the GPA of the calling object

   int getCredits();

   double getGPA();

   void setName(string& str);

   // "Mutator" or "mutator function"

        // Postcondition: data member name of the calling object has been set to str

   void setCredits(int);

   void setGPA(double);

   void setStuRec(string, int, double);

private:

   string name;     // Last name only

   int credits;

   double GPA;

};

// **** External functions for P4.2 ****

void inputStuRec(student& obj);

// prompts the user to enter values to fill obj

// Postcondition: obj is filled with user entered values

void outputStuRec(student& obj);

// Postcondition: contents of obj is displayed

int fillStuArray(student[], int size);

void sortStuArrayByName(student[], int n);

void displayStuReport(student[], int n);

void swap(student&, student&);

bool compareName(student& obj1, student& obj2);

bool compareGPA(student& obj1, student& obj2);

Explanation / Answer

#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

class student
{
public:
student()
{
   name = "No name";
   credits = 0;
   GPA = 0.0;
}
student(string nm, int cd, double gpa)
{
   name = nm;
   credits = cd;
   GPA = gpa;
}
string getName()
// "Accessor" or "accessor function"
// Postcondition: returns the name of the calling object
{
return name;
}
   // "Accessor" or "accessor function"
// Postcondition: returns the credits of the calling object
int getCredits()
{
   return credits;
}

// "Accessor" or "accessor function"
// Postcondition: returns the GPA of the calling object
double getGPA()
{
   return GPA;
}
  
void setName(string& str)
// "Mutator" or "mutator function"
// Postcondition: data member name of the calling object has been set to str
{
   name = str;
}

// "Mutator" or "mutator function"
// Postcondition: data member credits of the calling object has been set to cd     
void setCredits(int cd)
{
   credits = cd;
}

// "Mutator" or "mutator function"
// Postcondition: data member GPA of the calling object has been set to gpa
void setGPA(double gpa)
{
   GPA = gpa;
}

// "Mutator" or "mutator function"
// Postcondition: Sets all the variables of the student record.
void setStuRec(string nm, int cd, double gpa)
{
   setName(nm);
   setCredits(cd);
   setGPA(gpa);
}
  
private:
string name; // Last name only
int credits;
double GPA;
};

// **** External functions for P4.2 ****
void inputStuRec(student& obj)
// prompts the user to enter values to fill obj
// Postcondition: obj is filled with user entered values
{
    string nm;
    int cd;
    double gpa;
    cout<<"Enter the name of student: ";
    cin>>nm;
    cout<<"Enter the credits of student: ";
    cin>>cd;
    cout<<"Enter the gpa of the student: ";
    cin>>gpa;
    obj.setStuRec(nm, cd, gpa);
}

void outputStuRec(student& obj)
// Postcondition: contents of obj is displayed
{
    cout<<"Name: "<<obj.getName()<<endl;
    cout<<"Credits: "<<obj.getCredits()<<endl;
    cout<<"GPA: "<<obj.getGPA()<<endl;
}

//Given the student array and size as input.
//Postcondition: fills the student array with size number of records.
int fillStuArray(student stu[], int size)
{
    for(int i = 0; i < size; i++)
        inputStuRec(stu[i]);
    return size;      
}
//Given the student array and size as input.
//Postcondition: sorts the student array of n records.
void sortStuArrayByName(student stu[], int n)
{
    for(int i = 0; i < n-1; i++)
        for(int j = 0; j < n - i - 1; j++)
        {
           if(stu[j].getGPA() > stu[j+1].getGPA())
               swap(stu[j], stu[j+1]);
        }
}

//Postcondition: Prints the array of records.
void displayStuReport(student stu[], int n)
{
    for(int i = 0; i < n; i++)
    {
       outputStuRec(stu[i]);
       cout<<endl;
    }  
}

void swap(student& stu1, student& stu2)
{
    string tempS = stu1.getName();
    string nm = stu2.getName();
    stu1.setName(nm);
    stu2.setName(tempS);
   
    int tempI = stu1.getCredits();
    stu1.setCredits(stu2.getCredits());
    stu2.setCredits(tempI);
   
    double tempD = stu1.getGPA();
    stu1.setGPA(stu2.getGPA());
    stu2.setGPA(tempD);
}

bool compareName(student& obj1, student& obj2)
{
    return obj1.getName() == obj2.getName();
}

bool compareGPA(student& obj1, student& obj2)
{
    return obj1.getGPA() == obj2.getGPA();
}

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