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#include<iostream.h>
#include<conio.h>
 
class A;
 
class B 
 {
  int b;
 
  public:
 
  B(){b=12;}
  void display(A x);
 };
 
class A 
 {
  int a;
 
  public:
  A(){a=10;}
  friend void B::display(A);
 };
 
void B::display(A x)
{
    cout<<x.a<<b;            
}
 
int main() 
 {
  A a1;
  B b1; 
  b1.display(a1); 
  getch();
 }

prog.cpp:1:21: error: iostream.h: No such file or directory
prog.cpp:2:18: error: conio.h: No such file or directory
prog.cpp: In member function 'void B::display(A)':
prog.cpp:27: error: 'cout' was not declared in this scope
prog.cpp: In function 'int main()':
prog.cpp:35: error: 'getch' was not declared in this scope

Standard output is empty