運行環境：macOS shell 代碼：
#include <iostream>#include <iomanip>#include <string>using namespace std;class base{PRotected: int x;public: base(int x1) { x = x1; cout<<"constructing base, x = "<<x<<endl; }};class base1 : virtual public base{ int y;public: base1(int x1, int y1):base(x1) { y = y1; cout<<"constructing base1, y = "<<y<<endl; }};class base2 : virtual public base{ int z;public: base2(int x1, int z1):base(x1) { z = z1; cout<<"constructing base2, z = "<<z<<endl; }};class derived:public base1, public base2{ int xyz;public: derived(int x1, int y1, int z1, int xyz1):base(x1),base1(x1,y1),base2(x1,z1) { xyz = xyz1; cout<<"constructing derived, xyz = "<<xyz<<endl; }};int main (){ derived obj(1,2,3,4); return 0;}運行結果： 
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