C++ 程序问题 高手帮忙改改

[xxcpsdht]

#include <iostream>
#include <string>
using namespace std;

class CStudent{
public:
	CStudent();
	CStudent(string s);
	string sName; // 姓名
	string sNativePlace; // 籍贯
	string sStudentID; // 学号
	string sInfo;
	int iAge; // 年龄
	int iScorePlace; // 排名
	void Display(void);
private:
	string sStyle;
};

CStudent::CStudent(string s){
	sStyle = s;
}

void CStudent::Display(void){
	cout << sStyle << "信息: " << endl;
	cout << " --> 姓名: " << sName << endl;
	cout << " --> 籍贯: " << sNativePlace << endl;
	cout << " --> 学号: " << sStudentID << endl;
	cout << " --> 年龄: " << iAge << endl;
	cout << " --> 排名: " << iScorePlace << endl;
	if (sStyle == "导师")
		cout << " --> 导师信息: " << sInfo << endl;
	cout << endl;
}

class CMaster: public CStudent{
public:
	CMaster();
	CMaster(string s);
};

int main(void){
	CMaster master("导师");
	master.iAge = 22;
	master.iScorePlace = 1;
	master.sInfo = "QQ 272399954";
	master.sName = "X.Rabbit";
	master.sNativePlace = "HongKong";
	master.sStudentID = "ID Number 1";
	master.Display();
	system("PAUSE>NUL");
	return 0;
}

错误提示: 无法解析的外部符号
error LNK2001: unresolved external symbol "public: __thiscall CMaster::CMaster(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (??0CMaster@@QAE@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
1>D:\XXX\Documents\Visual Studio 2010\Projects\Temp\Release\Temp.exe : fatal error LNK1120: 1 unresolved externals

[LinuxBirdMan]

你没定义这个类的构造函数CMaster，你只给出申明。。。

[LinuxBirdMan]

把定义添加上去就OK了。。。

[KID_coder]

class CMaster: public CStudent{
public:
CMaster();
CMaster(string s);
};
这两个构造函数只声明，没有定义

[witwolf]

CMaster();
CMaster(string s);
没有定义，你要实现它

[KID_coder]

CStudent(); 这里也是

[pengzhixi]

CMaster(string s)：CStudent(s){}