where is the error??

[xhy_China]

Hello:
This evening I make a cpp file(it's a sample of c++
primer,chapter 3,string.cpp).The outline of it is below:
#include <iostream>
// line 1

class string;
istream& operator>>(istream&,string&); //
line 4
ostream& operator<<(ostream&,const string&);

class string
{
public:
string();
virtual ~string();
};

string::string()
{
//Do something
}

string::~string()
{
//Do something
}

istream& operator>>(istream& io,string& s)
{
//Do something
}

ostream& operator<<(ostream& os,string& s)
{
//Do something
}

int main()
{
//Do something
}

After I run the program,compiler tell me that missing ";"
before "&" in line 4,also line 5. I dont
know why(I use VC++ 6.0)??? Then I download the code of the book to
run,but it caused the same
error! why? How to modify the code???

Thx

 

[Thomas Tutone]

Hello:
This evening I make a cpp file(it's a sample of c++
primer,chapter 3,string.cpp).The outline of it is below:
#include <iostream>

Add the following here:

using std::istream;
using std:stream;

Remember, anything from the standard library is in namespace std, so
you must qualify the names or put in a using directive.

Best regards,

Tom

 

[xhy_China]

Thx ! The problem has been solved!

Add the following here:

using std::istream;
using std:stream;

Remember, anything from the standard library is in namespace std, so
you must qualify the names or put in a using directive.

Best regards,

Tom

 

[Nate Barney]

Add the following here:

using std::istream;
using std:stream;

Remember, anything from the standard library is in namespace std, so
you must qualify the names or put in a using directive.

Or using declarations, like you've done here. ;-)

Nate