instance variables

ocd.cpp

// ocd.cpp, all rights reserved for the future.


#include <cstdlib>
#include <iostream>

class OCD {

protected:

  size_t _number;
  
public:

  OCD ( );
  OCD ( size_t initial_value );
  size_t get ( );
  size_t set ( size_t value );
  
};

OCD::OCD ( ) : _number( 0 )
{
}
  
OCD::OCD ( size_t initial_value )
{
  _number = initial_value;
}
  
size_t OCD::get ( )
{
  return _number;
}
  
size_t OCD::set ( size_t value )
{
  size_t old = _number;
  
  _number = value;
  
  return old;
}
  

int main ( int argc, char *argv[] )
{
  OCD ocd0;
  OCD ocd1( 1 );
  OCD ocd2 = OCD( 2 );
  OCD *ocd3p = new OCD( 3 );
  
  std::cout << "ocd0.get( )     => " << ocd0.get() << std::endl;
  std::cout << "ocd1.get( )     => " << ocd1.get() << std::endl;
  std::cout << "ocd2.get( )     => " << ocd2.get() << std::endl;
  std::cout << "ocd3p->get( )   => " << ocd3p->get() << std::endl;
  std::cout << "ocd0.set( 4 )   => " << ocd0.set( 4 ) << std::endl;
  std::cout << "ocd1.set( 5 )   => " << ocd1.set( 5 ) << std::endl;
  std::cout << "ocd2.set( 6 )   => " << ocd2.set( 6 ) << std::endl;
  std::cout << "ocd3p->set( 7 ) => " << ocd3p->set( 7 ) << std::endl;
  std::cout << "ocd0.get( )     => " << ocd0.get() << std::endl;
  std::cout << "ocd1.get( )     => " << ocd1.get() << std::endl;
  std::cout << "ocd2.get( )     => " << ocd2.get() << std::endl;
  std::cout << "ocd3p->get( )   => " << ocd3p->get() << std::endl;
  
  return 0;
}

stdout

# used with an answer at http://stackoverflow.com/a/33980296/2492012
ocd0.get( )     => 0
ocd1.get( )     => 1
ocd2.get( )     => 2
ocd3p->get( )   => 3
ocd0.set( 4 )   => 0
ocd1.set( 5 )   => 1
ocd2.set( 6 )   => 2
ocd3p->set( 7 ) => 3
ocd0.get( )     => 4
ocd1.get( )     => 5
ocd2.get( )     => 6
ocd3p->get( )   => 7