帮忙改改C++小程序，怎样实现Computer的调用？？

#include using namespace std; class CPU{ private: int cpu; public: CPU(int i){ cpu=i; cout<<"the kind of cpu is:"<<cpu<<endl; cout<<"构造了一个CPU"<<endl;} ~CPU(){cout<<"析构了一个CPU"<<endl;} }; class RAM{ private: int ram; public: RAM(int j){ ram=j; cout<<"the kind of ram is:"<<ram<<endl; cout<<"构造了一个RAM"<<endl;} ~RAM(){cout<<"析构了一个RAM"<<endl;} }; class CDROM{ private: int cdrom; public: CDROM(int k){ cdrom=k; cout<<"the kind of cdrom is:"<<cdrom<<endl; cout<<"构造了一个CDROM"<<endl; } ~CDROM(){cout<<"析构了一个CDROM"<<endl;} }; class Computer{ private: CPU cpu; RAM ram; CDROM cdrom; public: Computer(int i,int j,int k){ cpu=i; ram=j; cdrom=k; CPU a(cpu); RAM b(ram); CDROM c(cdrom); cout<<"构造了一个Computer"<<endl;} ~Computer(){cout<<"析构了一个Computer"<<endl;} void run(){cout<<"kaishi"<<endl;} void stop(){cout<<"tingzhi"<<endl;} }; void main(){ Computer d(1,2,3); d.run(); d.stop(); }

错误主要在于 Computer 类的构造函数。cpu=i;ram=j;cdrom=k;这三句出现错误，i，j，k是基本数据类型 int，而cpu，ram，cdrom是自定义类的对象，直接赋值造成了类型不匹配。
C++中规定：如果一个类 A 中含有另一个类 B 的对象 b，作为其数据成员。那么该对象 b 的初始化，应该在 A 的构造函数基础上实现。实现如下：
A():b(){}.该题目中 Computer 类的实现，就应该如下：
Computer(int i,int j,int k):cpu(i),ram(j),cdrom(k)
{
cout<<"构造了一个Computer"<<endl;
}

整体程序修改如下：
#include <iostream>
using namespace std;

class CPU
{
private:
int cpu;
public:
CPU(int i)
{
cpu=i;
cout<<"the kind of cpu is:"<<cpu<<endl;
cout<<"构造了一个CPU"<<endl;
}
~CPU(){cout<<"析构了一个CPU"<<endl;}
};

class RAM
{
private:
int ram;
public:
RAM(int j)
{
ram=j;
cout<<"the kind of ram is:"<<ram<<endl;
cout<<"构造了一个RAM"<<endl;
}
~RAM(){cout<<"析构了一个RAM"<<endl;}
};

class CDROM
{
private:
int cdrom;
public:
CDROM(int k)
{
cdrom=k;
cout<<"the kind of cdrom is:"<<cdrom<<endl;
cout<<"构造了一个CDROM"<<endl;
}
~CDROM(){cout<<"析构了一个CDROM"<<endl;}
};


class Computer
{
private:
CPU cpu;
RAM ram;
CDROM cdrom;

public:
Computer(int i,int j,int k):cpu(i),ram(j),cdrom(k)
{
//cpu=i;
//ram=j;
//cdrom=k;
//CPU a(cpu);
//RAM b(ram);
//CDROM c(cdrom);
cout<<"构造了一个Computer"<<endl;
}
~Computer(){cout<<"析构了一个Computer"<<endl;}
void run(){cout<<"kaishi"<<endl;}
void stop(){cout<<"tingzhi"<<endl;}
};
void main()
{
Computer d(1,2,3);
d.run();
d.stop();
}

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