#include<iostream>
using namespace std;
int n = 0; 

class Student{
	private:
		int num;
	public:
		//默认构造函数 
		Student(){
			cout<<"调用默认构造函数"<<endl;
		};
		//有参构造函数 
		Student(int num){
			this->num = num;
			cout<<"调用有参构造函数"<<endl;
		};
		//拷贝构造函数 
		Student(const Student &s){
			num = s.num;
			cout<<"调用拷贝构造函数"<<++n<<"次"<<endl;
		};
		~Student(){};
};

void fun1(Student s){
	//由于函数的参数是类，所以会调用拷贝构造函数 
} 
Student fun2(){
	Student s1;
	return s1;
}
	 

int main(){
	Student s1;     
	Student s2(10); 
	Student s3(s2);

	fun1(s3);
	Student s4 = fun2();
	return 0;
}