Header file help

Having trouble getting my header file to compile correctly.

Code:

#ifndef Rectangle_h
#define Rectangle_h
class Rectangle
{              
                        
      public:
             double avgPerimeter;
             double avgArea,count; //count used a a counter to keep track of number of times i've computed the perimeter and area.
             double x,y,h,w;
             double Area, Perimeter;
             Rectangle();
             double getPerimeter();           
             double getArea();                   
             friend ostream& operator<<(ostream& outputStream, Rectangle& z);
             friend istream& operator>>(istream& inputStream, Rectangle& z); 
             
       private: 
             char color[]; 
};
#endif

Getting a compile error of

ISO C++ forbids declaration of 'ostream' with no type

'ostream' is neither function nor member function; cannot be declared friend

expected ';' before '&' token

It is also saying the same thing with the istream. I'm not sure where to go from here, this code was working till I broke off the code to a header file. Well it was working when all of my code was in the same file.

after your #define do:
#include<iostream>
using namespace std;

also you cant declare an array without giving the size, so you have to make color a pointer instead

Thanks, it fixed it.