使用VC6打开考生文件夹下的工程test25_1，此工程包含一个源程序文件test25_1.cpp，但该程序运行有问题，请改正程序中的错误，使程序的输出结果如下： privatel from derived1:30 privatel from derived2:30 源程序文件test25_1.cpp清单如下： /***************found******************/ include＜iostream.h＞ class base { protected:int privatel; public:base(int p){privatel=p;} }; /****************found*******************/ class derived1:public base { public:derivedl(int p1):base(p1){};int get_private(){return private1;} } class derived2:virtua1 public base { public:derived2(int p2):base(p2){};int get_private(){return private1;} }; class derived12:public derived1,public derived2 { public: /****************found*******************/derived12(int p1,int p2,int pb):derived1(p1), base(pb), derived2(p2){}; }; void main() {derived12 d(10,20,30);cout＜＜"privatel from derived1:"＜＜d.derived1::get_private();cout＜＜"\nprivatel from derived2:"＜＜d.derived2::get_private();cout＜＜endl;