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#include <iostream> 
class colours {
public : 
void colour ()
{
cout << "Black";
}
};
 
class shades : public colours
public : 
void colour ()
{ 
	cout << "White";
};
 

prog.cpp: In member function ‘void colours::colour()’:
prog.cpp:6:1: error: ‘cout’ was not declared in this scope
 cout << "Black";
 ^~~~
prog.cpp:6:1: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/6/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
prog.cpp: At global scope:
prog.cpp:11:1: error: expected ‘{’ before ‘public’
 public :
 ^~~~~~
prog.cpp:11:1: error: expected unqualified-id before ‘public’

Standard output is empty