main.cpp

Code:

#include "chuoi.h"
#include <iostream>
using namespace std;
void main()
{
   chuoi s;
   bool kq = s.rong();
   if(kq == true)
   {
      cout << "chuoi rong" << endl;
   }
   else
   {
      cout << "khac rong" << endl;
   }
}

chuoi.cpp

Code:

#include "chuoi.h"

bool chuoi::rong()
{
   bool kq = true;
   if(this->chieu_dai == 0)
   {
      kq = true;
   }
   else
   {
      kq = false;
   }
   return kq;
}

chuoi::chuoi()
{
   this->chieu_dai=0;
}

chuoi.h

Code:

class chuoi
{
   // cac thuoc tinh
   private :
      char a[256];
      int chieu_dai;
   //cac phuong thuc
   public :
      bool rong(); // kiem tra chuoi rong
      chuoi();
};

moi nguoi giai thich minh cac lenh nay voi

#include "contiki.h"
#include "lib/sensors.h"
#include "dev/sky-sensors.h"
#include "dev/light-sensor.h"

#include <io.h>

/* Photodiode 1 (P64) on INCH_4 */
/* Photodiode 2 (P65) on INCH_5 */
#define INPUT_CHANNEL ((1 << INCH_4) | (1 << INCH_5))
#define INPUT_REFERENCE SREF_0
#define PHOTOSYNTHETIC_MEM ADC12MEM4
#define TOTAL_SOLAR_MEM ADC12MEM5

const struct sensors_sensor light_sensor;

/*---------------------------------------------------------------------------*/
static int
value(int type)
{
switch(type) {
/* Photosynthetically Active Radiation. */
case LIGHT_SENSOR_PHOTOSYNTHETIC:
return PHOTOSYNTHETIC_MEM;

/* Total Solar Radiation. */
case LIGHT_SENSOR_TOTAL_SOLAR:
return TOTAL_SOLAR_MEM;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
return sky_sensors_status(INPUT_CHANNEL, type);
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int c)
{
return sky_sensors_configure(INPUT_CHANNEL, INPUT_REFERENCE, type, c);
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(light_sensor, "Light", value, configure, status);