继承的问题，怎么会变成递归了？

#include<iostream.h>
class A1{            // 定义基类A1
    int a1;
public:
    A1(int i){a1=i;cout<<"constructor A1."<<a1<<endl;}
    void print( ){cout<<a1<<endl;}
};
class A2{            // 定义基类A2
    int a2;
public:
    A2(int i){a2=i;cout<<"constructor A2."<<a2<<endl;}
    void print(){cout<<a2<<endl;}
};
class A3{                   // 定义A3
    int a3;
public:
    A3(int i){a3=i;cout<<"constructor A3."<<a3<<endl;}
    int geta3( ){return a3;}
};


class B:public A2 , public A1{// 定义派生类 B，基类为A1和A2
    int b;
    A3 obj_a3;  //对象成员
public:
      B(int i,int j,int k,int l):A1(i),A2(j), obj_a3 (k)//派生类构造函数
      {    b=l;
    cout<<"constructor B."<<b<<endl;
      }
      void print()
      {    static int c=1;
       c++;
       cout<<c<<endl;
       print();
    cout<<obj_a3. geta3()<<","<<b<<endl;
      }
};
void main( )
{    B bb(1,2,3,4);
    bb.print();//问题：为什么这里居然可以调用这个函数，调用次序有是怎么样的呢？请高手们指点指点迷津呢！！
}