light.cpp

《c＋＋大学教程》源码

// Fig. 7.34: light.cpp
// Member-function definitions for class Light.
#include <iostream>

using std::cout;
using std::endl;

#include "light.h"  // Light class definition

// constructor
Light::Light( int number ) 
   : on( false ), 
     floorNumber( number )
{ 
   cout << "floor " << floorNumber << " light constructed" 
        << endl;

} // end Light constructor

// destuctor
Light::~Light() 
{ 
   cout << "floor " << floorNumber 
        << " light destructed" << endl;

} // end ~Light destructor

// turn light on
void Light::turnOn() 
{ 
   if ( !on ) {  // if light not on, turn it on
      on = true; 
      cout << "floor " << floorNumber 
           << " light turns on" << endl;

   } // end if

} // end function turnOn

// turn light off
void Light::turnOff() 
{ 
   if ( on ) {  // if light is on, turn it off
      on = false; 
      cout << "floor " << floorNumber 
           << " light turns off" << endl;

   } // end if

} // end function turnOff

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