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什么是虚函数？什么是纯虚函数？两者有何区别？

最编程 2024-05-23 09:23:49
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#include<iostream> using namespace std; //含有虚函数的基类 class Base { public: virtual void vir_func() { cout << "virtual function, this is base class" << endl; } void func() { cout << "normal function, this is base class" << endl; } }; //派生类A class A : public Base { public: virtual void vir_func() { cout << "virtual function, this is A class" << endl; } void func() { cout << "normal function, this is A class" << endl; } }; //派生类B class B : public Base { public: virtual void vir_func() { cout << "virtual function, this is B class" << endl; } void func() { cout << "normal function, this is B class" << endl; } }; int main(int argc, char const *argv[]) { //多态 Base* base = new Base; Base* a = new A; Base* b = new B; //访问基类的func() base->func(); a->func(); b->func(); cout << "####################" << endl; //访问派生类的func() base->vir_func(); a->vir_func(); b->vir_func(); cout << "####################" << endl; ((A*)b)->vir_func(); ((A*)b)->func(); return 0; }

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