题解 | #设计立方体类#

#include<bits/stdc++.h> using namespace std; class rectangle{ private: int length,width; public: rectangle(int x,int y){ length=x; width=y; } void set(int x,int y){ length=x; width=y; } int getlength(){ return length; } int getwidth(){ return width; } virtual int getval(){ return length*width; } }; class cuboid:public rectangle{ private: int height; public: cuboid(int x,int y,int z):rectangle(x,y){ height=z; } virtual int getval() { return getlength()heightgetwidth(); }

}; int main(){ int x,y,z; cin>>x>>y>>z; cuboid a(x,y,z); rectangle b(x,y);

rectangle *p=&b;
cout<<p->getval()<<'\n';

p=&a;
cout<<p->getval();
return 0;

}