MOOC程序设计期中考试1.9

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

class Student {
private:
int id;
static int count;
public:

// 在此处补充你的代码

};
int Student::count;
void PrintCount() {
cout << "Total " << Student::count << " students" << endl;
}
void Print(Student s)
{
cout << "the id is " << s.id << endl;
}

int main()
{
Student::InitCount();
Student s;
PrintCount();
Student s1(10);
Student s2(s1);
PrintCount();
Print(s2);
PrintCount();
return 0;
}

无

Total 1 students
Total 3 students
the id is 10
Total 3 students#include <iostream>
#include <string>
using namespace std;

class Student {
private:
int id;
static int count;
public:
static Student InitCount(){return count = 0;};
Student(){count = 1;}
Student(int n){id = n;count = 3;}
Student(const Student &c)
{
id = c.id;

}

friend void PrintCount();
friend void Print(Student s);
};
int Student::count;
void PrintCount() {
cout << "Total " << Student::count << " students" << endl;
}
void Print(Student s)
{
cout << "the id is " << s.id << endl;
}

int main()
{
Student::InitCount();
Student s;
PrintCount();
Student s1(10);
Student s2(s1);
PrintCount();
Print(s2);
PrintCount();
return 0;
}