继承多个基类

测试代码：

#include<iostream>
using namespace std;

class base1{
protected:
 int m;
public:
 void show_m(){cout<<" m is "<<m<<endl;}
};

class base2{
protected:
 int n;
public:
 void show_n(){cout<<"n is "<<n<<endl;}
};

class derived_class: public base1,public base2{
 int mn;
public:
 void set_m_n(int x,int y){m=x;n=y;}
 void set_mn(){mn=m*n;}
 void show_mn(){cout<<"mn is "<<mn<<endl;}
};

int main()
{
 derived_class cl;
 cl.set_m_n(2,5);
 cl.show_m();
 cl.show_n();
 cl.set_mn();
 cl.show_mn();
 return 0;
}

测试结果：

 m is 2
n is 5
mn is 10
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