使用VC6打开考生文件夹下的工程test10_1,此工程包含一个源程序文件test10_1.cpp,但该程序运行有问题,请改正程序中的错误,使程序的输出结果为; class Base class D1 class D2 class D3 fin Base 源程序文件test10_1.cpp清单如下: #include<iostream.h> class Base { public:Base(){cout<<"class Base"<<endl;}void f(){cout<<"f in Base"<<endl;} }; class D1:virtual public Base { public:D1(){cout<<"class D1"<<endl;}void f(){cout<<"f in D1"<<endl;} }; /*********found**********/ class D2:public Base { public:D2(){cout<<"class D2"<<endl;} };/**********found**********/ class D3::public D1,public D2 { public:D3(){cout<<"class D3"<<endl;} }; void main() {D3 d; /**********found************/d.f(); }