要求实现自己的MyString2类，实现这样的函数MyString2(char chars[], int size);
假如头文件（MyString.h)是这样：
#include <iostream>
#include <cstring>
using namespace std;
class MyString2
{
public:
    MyString2(char chars[], int size);
private:
    char *s;
    int length;
   
};

头文件的实现文件是这样：
#include "MyString2.h"
#include <cstring>
#include <iostream>
using namespace std;

MyString2::MyString2(char chars[], int size)
{
    s = new char[size];
    for (int i = 0; i < size - 1; i++)
        s[i] = chars[i];
    s[size] = '\0';   
};


主函数是这样：
#include <iostream>
#include "MyString2.h"
#include <cstring>
using namespace std;

int main()
{
    char chars[4] = "abc";
    MyString2 s(chars, 4);
    cout << s << endl;
    return 0;
}

请问这个哪里出错了呢，不能直接显示s吗?谢谢了

运算符重载 ostream &operator<<(ostream &out, const MyString2 &obj);

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

class MyString2
{
public:
    MyString2(char chars[], int size);
    friend ostream& operator << (ostream &out, const MyString2& obj);
private:
    char *s;
    int length;
};

MyString2::MyString2(char chars[], int size)

 {
     s = new char[size];
     for (int i = 0; i < size - 1; i++)
         s[i] = chars[i];
     s[size] = '\0';  
}

ostream& operator << (ostream &out, const MyString2& obj)
{
    return out << obj.s;
}

int main()
{
    char chars[4] = "abc";

    MyString2 s(chars, 4);

    cout << s << endl;

    return 0;
}

真的非常感谢啊
可以编译通过了，运行出错，error C2664: 'MyString2::MyString2(const MyString2 &)' : cannot convert parameter 1 from 'char *' to 'const MyString2 &'
        Reason: cannot convert from 'char *' to 'const MyString2'
        No constructor could take the source type, or constructor overload resolution was ambiguous

[ 本帖最后由 ringlord 于 2012-4-18 21:01 编辑 ]

我用的是vs2008

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

class MyString2

 {

 public:
     MyString2(char chars[], int size);
     friend ostream& operator << (ostream &out, const MyString2& obj);
     {
        return out << obj.s;
     }

 private:
     char *s;
     int length;

 };

MyString2::MyString2(char chars[], int size)

 {
      s = new char[size];
      for (int i = 0; i < size - 1; i++)
          s[i] = chars[i];
      s[size] = '\0';

 }

/*
ostream& operator << (ostream &out, const MyString2& obj)

 {
     return out << obj.s;

 }*/

int main()

 {
     char chars[4] = "abc";

    MyString2 s(chars, 4);

    cout << s << endl;

    return 0;

 }

vc6.0中可以

#include <iostream>
#include <cstring>
using namespace std;
这几句在头文件中不用出现，只出现在.cpp文件就可啊；

我 没弄头文件    就一个.cpp   

应该行啊，我试了一下