HI All,

I have a problem when designed multiple windows.I have three windows: mainwindow , A, B. primary code see as below:

mainwindow.cpp
class main
{
private:
A a;
B b;
}

a.cpp

class B;
class A
{
private:
B *b;
}

b.cpp

class A;
class B
{
private:
A *a;
}

when I runned with debug , compile succeed, but the program runned in the background, why? please give me correct solution, TKS.