list1908.cpp

teach yourself C++ in 21 days 第五版

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

class Student
{
  public:
    Student();
    Student(const string& name, const int age);
    Student(const Student& rhs);
    ~Student();

    void   SetName(const string& name);
    string   GetName()   const;
    void   SetAge(const int age);
    int      GetAge()   const;

    Student& operator=(const Student& rhs);

  private:
    string itsName;
    int itsAge;
};

Student::Student()
: itsName("New Student"), itsAge(16)
{}

Student::Student(const string& name, const int age)
: itsName(name), itsAge(age)
{}

Student::Student(const Student& rhs)
: itsName(rhs.GetName()), itsAge(rhs.GetAge())
{}

Student::~Student()
{}

void Student::SetName(const string& name)
{
   itsName = name;
}

string Student::GetName() const
{
   return itsName;
}

void Student::SetAge(const int age)
{
   itsAge = age;
}

int Student::GetAge() const
{
   return itsAge;
}

Student& Student::operator=(const Student& rhs)
{
   itsName = rhs.GetName();
   itsAge = rhs.GetAge();
   return *this;
}

ostream& operator<<(ostream& os, const Student& rhs)
{
   os << rhs.GetName() << " is " << rhs.GetAge() << " years old";
   return os;
}

template<class T>
// display vector properties
void ShowVector(const vector<T>& v);    

typedef vector<Student>   SchoolClass;

int main()
{
   Student Harry;
   Student Sally("Sally", 15);
   Student Bill("Bill", 17);
   Student Peter("Peter", 16);

   SchoolClass   EmptyClass;
   cout << "EmptyClass:" << endl;
   ShowVector(EmptyClass);

   SchoolClass GrowingClass(3);
   cout << "GrowingClass(3):" << endl;
   ShowVector(GrowingClass);

   GrowingClass[0] = Harry;
   GrowingClass[1] = Sally;
   GrowingClass[2] = Bill;
   cout << "GrowingClass(3) after assigning students:" << endl;
   ShowVector(GrowingClass);

   GrowingClass.push_back(Peter);
   cout << "GrowingClass() after added 4th student:" << endl;
   ShowVector(GrowingClass);

   GrowingClass[0].SetName("Harry");
   GrowingClass[0].SetAge(18);
   cout << "GrowingClass() after Set\n:";
   ShowVector(GrowingClass);

   return 0;
}

//
// Display vector properties
//
template<class T>
void ShowVector(const vector<T>& v)
{
   cout << "max_size() = " << v.max_size();
   cout << "\tsize() = " << v.size();
   cout << "\tcapacity() = " << v.capacity();
   cout << "\t" << (v.empty()? "empty": "not empty");
   cout << endl;

   for (int i = 0; i < v.size(); ++i)
      cout << v[i] << endl;

   cout << endl;
}