#include iostreamhvoid subint x int y int z z = y + x;void main int a b c; sub8 4 &a; sub6 a &b; suba b &c; cout a b c endl;3、给出下述源程序的运行结果。#include iostreamhclass A private int a b;public

果。 #include <iostream.h> class A { public: virtual void fun() { cout << "A::fun" << endl; } }; class B : public A { public: void fun() { cout << "B::fun" << endl; } }; void main() { A a; B b; A *p = &a; p->fun(); p = &b; p->fun(); } 运行结果：A::fun B::fun