#include iostreamusing namespace std;class Base int ab; public Baseint xint y a=x;b=y;void show cout a=a b=b; ;class Derivedpublic Base int c;publicDerivedint xint yint zBasexy c=z;void show Basesho
调用的是Derived派生类的show()函数；函数"show()"称为虚函数，实现了动态多态性。
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