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#include<iostream> using namespace std; class top { public: int a; void getdata() { cout<<"\n\nenetr first number :::\t"; cin>>a; } void putdata() { cout<<"\nfirst number is :::\t"<<a; } }; class middle :public top { public: int b; void square() { getdata(); b=a*a; cout<<"\n\nsquareis :::"<<b; } }; class bottom :public middle { public: int c; void cube() { square(); c=b*a; cout<<"\n\ncube :::\t"<<c; } }; int main() { bottom b1; b1.cube(); }