Explain each line in main and explain why the output looks how it looks.   #include using namespace std;   class A { public:        A()        {               n=0;        }        A(int x)        {               n=x;        }        void f()        {               n++;        }        void g()        {               f();               n=n*2;               f();        }        int k()        {               return n;        }        void p()        {               cout<

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