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virtual function role
//g++ 5.4.0 #include <iostream> using namespace std; class fruit { public: virtual void eatit(int q=10) { cout<<"fruit::eatit,q="<<q<<endl; } }; class mango:public fruit{ public: virtual void eatit(int q) { cout<<"mango::eatit,q="<<q<<endl; } }; int main() { mango d1; d1.eatit(44); fruit *bp=&d1; bp->eatit(); return 0; }
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