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;