Question

C++ 初学者。。。求解 missing storage-class or type specifiers

#include <iostream.h>
class A
{
public:
A():son1(x),son2(y) {cout<<"chenggong"<<x*y<<endl;}
private:
B son1;
C son2;
};
class B
{
public:
B() {a=9; cout<<"bbbbbbb"<<endl;}
private:
int a;
};
class C
{
public:
C() {b=8; cout<<"ccccccc"<<endl;}
private:
int b;
};
void main()
{
A data1;
}

Answer 1

已改，看注释
#include <iostream>
using namespace std;
class B
{
public:
B() {a=9; cout<<"bbbbbbb"<<endl;}
int getA(){return a;} //返回私有成员a
private:
int a;
};
class C
{
public:
C() {b=8; cout<<"ccccccc"<<endl;}
int getB(){return b;} //返回私有成员b
private:
int b;
};
class A //A类放B、C类后面
{
public:
A(B x, C y):son1(x),son2(y) {cout<<"chenggong"<<x.getA()*y.getB()<<endl;}
private:
B son1;
C son2;
};
void main()
{
B b;
C c;
A data1(b, c); //传B、C类对象
}

Answer 2

B和C写在A前面。

追问

换完还不对
这个怎么定义
C:\Users\wang\Desktop\a\a.cpp(20) : error C2065: 'x' : undeclared identifier
C:\Users\wang\Desktop\a\a.cpp(20) : error C2065: 'y' : undeclared identifier