When to call Constructor and Destructor?

 #include <iostream>using namespace std;class ShowPos{public:char pos[100];ShowPos(const char* str){strcpy(pos,str);printf("%s constructor/n",pos);}~ShowPos(){printf("%s destructor/n",pos);}};ShowPos pos1("Global1");int main(){ShowPos pos1("Main1");{ShowPos pos1("Local1");ShowPos("Temporary1");ShowPos("Temporary2");ShowPos pos2("Local2");}ShowPos pos2("Main2");return 0;};ShowPos pos2("Global2");

 

Output:

Global1 constructor
Global2 constructor
Main1 constructor
Local1 constructor
Temporary1 constructor
Temporary1 destructor
Temporary2 constructor
Temporary2 destructor
Local2 constructor
Local2 destructor
Local1 destructor
Main2 constructor
Main2 destructor
Main1 destructor
Global2 destructor
Global1 destructor