C和C++语言学习总结(二)(3)

　　(1)不同的范围(分别位于派生类与基类);

　　(2)函数名字相同;

　　(3)参数相同;

　　(4)基类函数必须有virtual 关键字.

#include

class Base

{

public:

void f(int x) { cout < < "Base::f(int) " < < x < < endl; }

void f(float x) { cout < < "Base::f(float) " < < x < < endl; }

virtual void g(void) { cout < < "Base::g(void)" < < endl;}

void h(float x) { cout < < "Base::h(float) " < < x < < endl;}

void k(float x) { cout < < "Base::k(float) " < < x < < endl;}

};

class Derived : public Base

{

public:

virtual void g(void) { cout < < "Derived::g(void)" < < endl;}

void h(int x) { cout < < "Derived::h(int) " < < x < < endl; }

void k(float x) { cout < < "Derived::k(float) " < < x < < endl;}

};

void main(void)

{

Derived d;

Base*pb = &d;

Derived *pd = &d;

pb->f(42); // Base::f(int) 42 //重载

pb->f(3.14f); // Base::f(float) 3.14 //重载

pb->g(); // Derived::g(void) //覆盖

pd->g(); // Derived::g(void) //覆盖

pb->h(3.14f) // Base::h(float) 3.14 //隐藏

pd->h(3.14f) // Derived::h(int) 3 //隐藏

pb->k(3.14f) // Base::k(float) 3.14 //隐藏

pd->k(3.14f) // Derived::k(float) 3.14 //隐藏

}