Operator overloading

[yoked88]

I am getting an error and I have no idea why, I think it pertains to my cin statement but cannont figure out what is going on exactly. Can anyone help?

#ifndef H_myString
#define H_myString
#include <iostream>

using namespace std;

class newString
{
	friend ostream& operator<<(ostream&, const newString&);
	friend istream& operator>>(istream&, newString&);
public:
	const newString& operator=(const newString&);
	newString(const char*); //constructor - conversion from char string
	newString(); //default constructor
	newString(const newString&); //copy constructor
	~newString(); //destructor
	char& operator[] (int); 
	const char& operator[] (int) const;
	bool operator==(const newString&) const;
	bool operator!=(const newString&) const;
	bool operator<=(const newString&) const;
	bool operator<(const newString&) const;
	bool operator>=(const newString&) const;
	bool operator>(const newString&) const;
private:
	char *strPtr;
	int strLength;
};

#endif 

#include <iostream>
#include <iomanip>
#include <cstring>
#include <cassert>
#include "myString.h"

using namespace std;

newString::newString(const char *str)
{
	strLength = strlen(str);
	strPtr = new char[strLength + 1];
	strcpy(strPtr, str);
}

newString::newString()
{
	strLength = 0;
	strPtr = new char[1];
	strcpy(strPtr, "");
}

newString::newString(const newString &other)
{
	strLength = other.strLength;
	strPtr = new char[strLength + 1];
	strcpy(strPtr, other.strPtr);
}

newString::~newString()
{
	delete [] strPtr;
}

const newString& newString::operator =(const newString &other)
{
	if(this != &other)
	{
		delete [] strPtr;
		strLength = other.strLength;
		strPtr = new char[strLength + 1];
		strcpy(strPtr, other.strPtr);
	}
	return *this;
}

char& newString::operator [](int index)
{
	assert(0 <= index && index < strLength);
	return strPtr[index];
}

const char& newString::operator [](int index) const
{
	assert(0 <= index && index < strLength);
	return strPtr[index];
}

bool newString::operator ==(const newString &other) const
{
	return (strcmp(strPtr, other.strPtr) == 0);
}

bool newString::operator <(const newString &other) const
{
	return (strcmp(strPtr, other.strPtr) < 0);
}

bool newString::operator <=(const newString &other) const
{
	return (strcmp(strPtr, other.strPtr) <= 0);
}

bool newString::operator >(const newString &other) const
{
	return (strcmp(strPtr, other.strPtr) > 0);
}

bool newString::operator >=(const newString &other) const
{
	return (strcmp(strPtr, other.strPtr) >= 0);
}

bool newString::operator !=(const newString &other) const
{
	return (strcmp(strPtr, other.strPtr) != 0);
}

ostream& operator<<(ostream& out, const newString& str)
{
	out << str.strPtr;
	return out;
}

istream& operator>>(istream in, newString& str)
{
	char temp[81];
	in >> setw(81) >> temp;
	str = temp;
	return in;
}

#include <iostream>
#include "myString.h"

using namespace std;

int main()
{
	newString str1 = "Sunny";
	const newString str2("Warm"); //initialize using conversion constructor
	newString str3, str4;
	cout << str1 << "     " << str2 << " ***" << str3 << "###." << endl;

	if(str1 <= str2)
		cout << str1 << " is less than " << str2 << endl;
	else
		cout << str2 << " is less then " << str1 << endl;
	cout << "Enter a string with a minimum length of 7: ";
	cin >> str1;
	cout << endl;
	cout << "New value of str1 = " << str1 << endl;
	str4 = str3 = "Birth Day";
	cout << "str3 = " << str3 << ", str4 = " << str4 << endl;
	str3 = str1;
	cout << "New value of str3 = " << str3 << endl;
	str1 = "Birght Sky";
	str3[1] = str1[5];
	cout << "After replacing 2nd character of str3 = " << str3 << endl;
	str3[2] = str2[0];
	cout << "After replacing 3rd character of str3 = " << str3 << endl;
	str3[5] = 'g';
	cout << "After replacing 6th character of str3 = " << str3 << endl;
	system("PAUSE");
	return 0;
}

1>main.obj : error LNK2019: unresolved external symbol "class std::basic_istream<char,struct std::char_traits<char> > & __cdecl operator>>(class std::basic_istream<char,struct std::char_traits<char> > &,class newString &)" (??5@YAAAV?$basic_istream@DU?$char_traits@D@std@@@std@@AAV01@AAVnewString@@@Z) referenced in function _main
1>C:\Users\Joseph\Documents\Visual Studio 2008\Projects\MoreExamples\Debug\MoreExamples.exe : fatal error LNK1120: 1 unresolved externals

[yoked88]

Ah nevermind, I figured it out, missed the reference in the cpp file!!