#include <iostream>
using namespace std;

// Class declaration //
class vector {
public:
       vector( double = 0.0, double = 0.0, double = 0.0 );  // Constructor
       vector( const vector & );   // Overloaded constructor
       
       void show( void );
       double entry( int );
       
private:
       double data[3];   // Private data
};

// Prototypes for non-member functions
void show( vector );
void show( char[], vector );

// Member function definitions
vector::vector( double x, double y, double z )
{
   data[0] = x;
   data[1] = y;
   data[2] = z;
}

vector::vector( const vector &x )
{
   data[0] = x.data[0];
   data[1] = x.data[1];
   data[2] = x.data[2];
}

void vector::show( void )
{
   cout << "( " << data[0] << ", "
        << data[1] << ", " << data[2] << " )";
   return;
}

double vector::entry( int i )
{
   return( data[i] );
}

// Non-member function definitions
void show( vector u ) 
{
   cout << "( " << u.entry(0) << ", "
        << u.entry(1) << ", " << u.entry(2) << " )";
   return;
}

void show( char name[], vector u ) 
{
   cout << name << " = ";
   cout << "( " << u.entry(0) << ", "
        << u.entry(1) << ", " << u.entry(2) << " )";
   cout << endl;
   return;
}