05_0824_编写String的问题（C＋＋）

主函数如下：

#include "stdafx.h"

#include "iostream.h"

#include "String.h"

void main()

{

String str;

str='a';

★ cout<<str<<endl;

}

String类的定义如下：

class String

{

public:

String();

virtual ~String();

public:

String& operator=(char chVar);

protected:

char* m_pszBuffer;

int m_nLength;

};

String类的实现如下：

#include "stdafx.h"

#include "String.h"

String::String()

{}

String &String::operator = (char chVar)

{

m_pszBuffer=new char[2];

m_pszBuffer[0]=chVar;

m_pszBuffer[1]='\0';

return *this;

}

String::~String()

{}

程序编译出现如下问题：

error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class String' (or there is no acceptable conversion)

Error executing cl.exe.

指向带有★的行。