1c:\documents and settings\usman.younis\my documents... studio 2010\Projects\friends\friends\friends.cpp
# include < iostream >
using namespace std ;
class student
{
private :
int stud _ reg _ num ;
char stud _ name [ 50 ] ;
// private data , can ' t be accessed
// in main () , any other function , or a class
public :
student ()
{
stud _ reg _ num = 0 ;
strcpy ( stud _ name , "") ;
}
// to access this data in another class
// we made it frined of student
friend class my _ Class ;
};
class my _ Class
{
private :
int counter ;
student Student [ 50 ] ;
void display _ student ( int a ) ;
public :
my _ Class () : counter ( 0 ) {}
void set _ student _ val ( int r _ num , char * name ) ;
friend void display _ students _ from _ main ( my _ Class & b ) ;
};
void my _ Class :: display _ student ( int a )
{
// private member function
// Can ' t be accessed from main ()
cout << " Student registration number is : " << Student [ a ]. stud _ reg _ num << endl ;
cout << " Student name is : " << Student [ a ]. stud _ name << endl ;
}
void my _ Class :: set _ student _ val ( int r _ num , char * name )
{
// public member function
// Can be accessed from main ()
Student [ counter ]. stud _ reg _ num = r _ num ;
strcpy ( Student [ counter ]. stud _ name , name ) ;
counter ++ ;
}
void display _ students _ from _ main ( my _ Class & b )
{
// function is not a member of class
// therefore , we havent used scope resolution operator
for ( int i = 0 ; i < b . counter ; i ++)
b . display _ student ( i ) ;
}
void set _ students _ from _ main ( my _ Class & b )
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