C++ inheritance program using virtual keyword in hybrid or single or multilevel inheritance

/*C++ inheritance program using virtual keyword in hybrid or single or multilevel inheritance*/ #include<iostream.h> #include<conio.h> using namespace std; class student { public: int roll; void putroll() { cout<<"Enter your roll no :"; cin>>roll; } }; class test:virtual public student {      public:      float sub1;      float sub2; void putsub() {      cout<<"Enter marks of two subjects: ";      cin>>sub1>>sub2; } }; class Sports:virtual public student {      public:      float score;      void putscore()      {            cout<<"Enter Your score: ";            cin>>score;      } }; class result :public virtual test,public virtual Sports {      public:      float total;      void display()      {            total=sub1+sub2;            cout<<"Your roll no: "<<roll;            cout<<"Marks is "<<total;            cout<<"Score is "<<score;      } }; int main() {      result std1;      std1.putroll();      std1.putsub();      std1.putscore();      std1.display();      getch(); }