Need some help with C++ object oriented programing

k so heres my problem im writing a program that has a class called String and this will take a string and remove the null charicter and it will have a varible for the length of the string.

im using Dev C++ as a compiler, yeah probly not the best but its free.

the errors im getting are when i start to overload ostream.
heres what the compiler says:

11 main.cpp In file included from main.cpp
121 My_String.h ISO C++ forbids declaration of `ostream' with no type
121 My_String.h `ostream' is neither function nor member function;
cannot be declared friend
121 My_String.h expected `;' before '&' token
125 My_String.h ISO C++ forbids declaration of `istream' with no type
125 My_String.h `istream' is neither function nor member function;
cannot be declared friend
125 My_String.h expected `;' before '&' token
G:\CISP 430\Project2\Makefile.win [Build Error] [main.o] Error 1

and now the main part of the code
first the .h file

Code:

---

class String
{
   
    char* STR; //string
    unsigned Len; // length of string
   
public
    friend ostream& operator<< (ostream& , const String&);

    friend istream& operator>> (istream& , const String&);

---

now the .cpp file

Code:

---


ostream& operator<<(ostream& Os, const String& s)
{
    for(unsigned I=0; I < s.Len;I++)
    {
        Os<<s[I];
    }
    return (Os);
}

istream& operator>>(istream& Is, const String& s )
{
    String Temp;
    char cc;
    while (is.get(cc))
    {
        if (cc=='\n')
        {
            break;
        }
    }
    Temp +=cc;
    s = Temp;
    return Is;
}

---

You're not including the standard headers for istream and ostream, and/or not getting them into the correct scope.

What tutorial are you going by? This code has many other errors, too.

well thats not all my code. but just to make sure i have all the right headers in my files here they are these are just the headers in each file.

Main.cpp

Code:

---

#include <cstdlib>
#include <iostream>
#include "My_String.h"

using namespace std;

---

My_String.cpp

Code:

---

#include <cstdlib>
#include <iostream>
#include "My_String.h"

using namespace std;

---

My_String.h

Code:

---

#include <iostream>

using namespace std;

---

and if you would like to see all code just let me know
thank you.