visual c++ - Constructor and Destructor in C++ -

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can tell why don't add "getch()" or "system("pause")", result right in first code else in second code display lack code in part destructor

    #include "iostream.h"     class chucmung1     {      public :          chucmung1()          {                     cout <<"chuc mung ban nam moi khang thinh vuong\n";           }          ~chucmung1()          {                      cout <<"nam tan ty\n";          }       };    //  first code      int main()      {       chucmung1 object;       system("pause > null");          }    // second code          int main()      {       chucmung1 object;      }

in first code, result "chuc mung ban nam moi khang thinh vuong"

in second code, result "chuc mung ban nam moi khang thinh vuong nam tan ty" in case when console don't pause after display result.

can tell why don't add "getch()" or "system("pause")", result right in first code

the object goes out of scope , destructed when main() exits. there nothing in code sample preventing main() exiting, object being destroyed without delay.

else in second code display lack code in part destructor

the getch/pause delaying main() exiting, , object still in scope @ time of pause, has not been destructed yet.

if want object destructed before pausing code, can put object scope gets destructed earlier:

int main() {     {         chucmung1 object;     }     system("pause > null");     }

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