深入解析C++中的构造函数和析构函数

#include<iostream>
#include<string>
using namespace std;
class Student{
 public:
  Student(string,string,string);
  ~Student();
  void show();
 private:
  string num;
  string name;
  string sex;
};
Student::Student(string nu,string na,string s){
 num=nu;
 name=na;
 sex=s;
 cout<<name<<" is builded!"<<endl;
}
void Student::show(){
 cout<<num<<"\t"<<name<<"\t"<<sex<<endl;
}
Student::~Student(){
 cout<<name<<" is destoried!"<<endl;
}
int main(){
 Student s1("001","千手","男");
 s1.show();
 Student s2("007","纲手","女");
 s2.show();
 cout<<"nihao"<<endl;
 cout<<endl;
 cout<<"NIHAO"<<endl;
 return 0;
}

#include<iostream>
#include<string>
using namespace std;
class Student{
 public:
  Student(string,string);
  ~Student();
  void show();
  string num;
  string name;
};
Student::Student(string nu,string na){
 num=nu;
 name=na;
 cout<<name<<" is builded!"<<endl<<endl;
}
void Student::show(){
 cout<<num<<"\t"<<name<<endl<<endl;
}
Student::~Student(){
 cout<<name<<" is destoried!"<<endl<<endl;
}
void fun(){
 cout<<"============调用fun函数============"<<endl<<endl;
 Student s2("002","自动局部变量");//定义自动局部对象
 s2.show();
 static Student s3("003","静态局部变量");//定义静态局部变量
 s3.show();
 cout<<"===========fun函数调用结束=============="<<endl<<endl;
}
int main(){
 Student s1("001","全局变量");
 s1.show();
 fun();
 cout<<"\nthis is some content before the end\n";//这是一段位于main函数结束之前，函数调用之后的内容
 cout<<endl;
 return 0;
}