阅读项目，写出执行结果4

#include <iostream>
using namespace std;
class Base
{
public:
Base(char i) { cout<<"Base constructor. --"<<i<<endl; }
};
class Derived1:virtual public Base
{
public:
Derived1(char i,char j):Base(i){
cout<<"Derived1 constructor. --"<<j<<endl;
}
};
class Derived2:virtual public Base
{
public:
Derived2(char i,char j):Base(i){
cout<<"Derived2 constructor. --"<<j<<endl;
}
};
class MyDerived: public Derived1,public Derived2
{
public:
MyDerived(char i,char j,char k,char l,char m,char n,char x):
Derived2(i,j), Derived1(k,l), Base(m), d(n){
cout<<"MyDerived constructor. --"<<x<<endl;
}
private:
Base d;
};
int main()
{
MyDerived obj('A','B','C','D','E','F','G');
return 0;
}

运行结果：



过程分析：

base 是一个虚基类，只有最远派生类的构造函数才会调用虚基类的构造函数，该派生类的其他基类对虚基类的构造函数的调用都会忽略，所以初始化只进行一次

按照继承顺序 对derived1 derived2进行初始化

对myderived中的base型的数据进行初始化

最后执行构造函数中的输出语句