#include <iostream>
#include <iomanip>
#include <cstring>

using std::cout;
using std::endl;
using std::fixed;
using std::setprecision;

class Student
{
private:

    // Data members
    char name[31];
    double gpa;

public:

    // Constructors
    Student();
    Student(const char*, double);

    // Accessor and mutator member functions
    void set_name(const char*);
    const char* get_name() const;
    void set_gpa(double);
    double get_gpa() const;

    // Other member functions
    void print() const;
};

int main()
{
    Student s1;                             // Initialized by default constructor.
    Student s2("Anna Gonzalez", 3.65);      // Initialized by parameterized constructor.
    const Student s3("Todd Bell", 3.24);    // Initialized by parameterized constructor.
    
    // Test object s1.
    s1.print();
    cout << endl << s1.get_name() << endl;
    cout << s1.get_gpa() << endl << endl;
    
    s1.set_name("Shannon Willis");
    s1.set_gpa(3.54);

    s1.print();
    cout << endl << s1.get_name() << endl;
    cout << s1.get_gpa() << endl << endl;

    // Test object s2.
    s2.print();
    cout << endl << s2.get_name() << endl;
    cout << s2.get_gpa() << endl << endl;
    
    s2.set_name("Anna Castro");
    s2.set_gpa(3.72);
    
    s2.print();
    cout << endl << s2.get_name() << endl;
    cout << s2.get_gpa() << endl << endl;

    // Test object s3. Object is constant, so calling a non-constant
    // mutator member function will cause a syntax error.
    s3.print();
    cout << endl << s3.get_name() << endl;
    cout << s3.get_gpa() << endl;
    
    return 0;
}

// Student constructors

Student::Student()
{
    strcpy(name, "None");
    gpa = 0.0;
}

Student::Student(const char* new_name, double new_gpa)
{
    set_name(new_name);
    set_gpa(new_gpa);
}

// Student accessor and mutator member functions

void Student::set_name(const char* new_name)
{
    strcpy(name, new_name);
}

const char* Student::get_name() const
{
    return name;
}

void Student::set_gpa(double new_gpa)
{
    if (new_gpa < 0.0)
        gpa = 0.0;
    else if (new_gpa > 4.0)
        gpa = 4.0;
    else
        gpa = new_gpa;
}

double Student::get_gpa() const
{
    return gpa;
}

// Other member functions

void Student::print() const
{
    cout << "Name: " << name << endl
         << "GPA: " << fixed << setprecision(2) << gpa << endl;
}