Elevator system code in C++

  #include "elev_app.h"
#include "msoftcon.h"
#include <iostream>
#include <iomanip>
#include<conio.h>
#include<stdlib.h>
#include<process.h>

using namespace std;

enum direction { UP,DOWN, STOP };
 //loading/unloading time (ticks)
const int LOAD_TIME = 3;
const int SPACING = 7;
const int BUF_LENGTH = 80;

class building;  //forward declaration

class elevator
   {
  private:
    building* ptrBuilding;
    const int car_number;
    int current_floor;
    int old_floor;
    direction current_dir;
    bool destination[NUM_FLOORS];
    int loading_timer;
    int unloading_timer;  

  public:
     elevator(building*,int);
     void car_tick1();
     void car_tick2();
     void car_display();
     void dests_display() const;
     void decide();
     void move();
     void get_destinations();
     int get_floor() const;
direction get_direction() const;
   };

class building
   {
  private:
     elevator* car_list[NUM_CARS];
     int num_cars;  //cars created so far

     bool floor_request[2][NUM_FLOORS]; //False=UP True=Down

  public:
      building();
      ~building();
      void master_tick(); //send tick to all cars
      int get_cars_floor(const int) const;
      direction get_cars_dir(const int) const;
      bool get_floor_req(const int,const int);
      void set_floor_req(const int,const int,const bool);
      void record_floor_reqs();   //get floor request
      void show_floor_reqs() const;   //show fllor request
   };
   
   


   
   

After you have created the elev.h now create elev.cpp the main executable file.
 #include "elev.h"

building::building()
      {
//string for floors
      char ustring[BUF_LENGTH];

   //intialize graphics
  init_graphics();

 //clear screen
   clear_screen();

   num_cars = 0;
   for(int k=0; k<NUM_CARS; k++)
       {
      car_list[k] = new elevator(this, num_cars);
      num_cars++;
       }
   for(int j=0;mj<NUM_FLOORS; j++)
       {
       set_cursor_pos(3,NUM_FLOORS-j);  //put floor number
       itoa(j+1, ustring, 10);
       cout << setw(3) << ustring;
       floor_request[UP][j] = false; //no floor request yet
       floor_request[DOWN][j] = false;
        }
    }
//end constructor

//start destructor
    building::-building()
        {
         for(int k=0; k<NUM_CARS; k++)
         delete car_list[k];
         }
//master time tick
void building::master_tick()
   {
   int j;
   show_floor_reqs();
   for(j=0; j<NUM_CARS; j++)
      car_list[j]->car_tick1();
   for(j=0; j<NUM_CARS; j++)
      car_list[j]->car_tick2();
   }

//display floor request
void building::show_floor_reqs() const
      {
       for(int j=0; j<NUM_FLOORS; j++)
          {
           set_cursor_pos(SPACING, NUM_FLOORS-j);
           if(floor_request[UP][j]==true)
               cout << "\x1E";  //up arrow
        else      
               cout << " ";
            set_cursor_pos(SPACING+3, NUM_FLOORS-j);
            if(floor_request[DOWN][j]==true)
                cout << "\1xF";
        else
               cout << " ";
    }
 }

//get requets from riders outside the cars
void building::record_floor_reqs()
       {
        char ch = "x";
        char ustring[BUF_LENGTH];
        int iFloor;
        char chDirection; //'u' or 'd' for up and down

        set_cursor_pos(1,22);
        cout << "Press [ENTER] to call an elevator:";
        if(!kbhit())   // wait for keypress
            return;
        cin.ignore(10, "\n");
        if(ch=="\x1B") //if escape key end the program
             exit(0);
        set_cursor_pos(1,22); clear_line(); //clear old text
        set_cursor_pos(1,22); //bottom of screen
        cout << "Enter the floor you're on:";
        cin.get(ustring,BUF_LENGTH);
        cin.ignore(10, "\n");
        iFloor = atoi(ustring);  //convert to integer

        cout << "Ente the direction you want to go"(U or D):";
        cin.get(chDirection);  //(avoid multiple lines feeds)
        cin.ignore(10,"\n");

        if(chDirection=='u' || chDirection=='U')
           floor_request[UP][iFloor-1] = true; //up floor request
        if(cgDirection=='d' || chDirection=='D')
           floor_request[DOWN][iFloor-1]=true; //down floor request
        set_cursor_pos(1,22);
        set_cursor_pos(1,23);
        set_cursor_pos(1,24);
   }

//see if there is a specific request
   bool building::get_floor_req(const int dir,const int floor) const //check error on compiling here
      {
  return floor_request[dir][floor];
      }

//set specific floor request
  bool building::set_floor_req(const int dir, const int floor, const bool updown)
     {
     floor_request[dir][floor]=updown;
     }

//---------------------------------------------
   
find where the carrier is in this case car
 int building::get_cars_floor(const int carNo)const
     {
      return car_list[carNo]->get_floor();
      }
 //find which direction the car is moving
 direction building::get_cars_dir(const int carNo) const
      {
       return car_list[carNo]->get_direction();
       }

//  function definitions for class elevator begins here
  elevator::elevator(building* ptrB. int nc) :
                                 ptrBuilding(ptrB),car_number(nc)
       {
       current_floor = 0; //start at 0
       old_floor = 0;
       current_dir = STOP;
       for(int j=0; j<NUM_FLOOR; j++)
             destination[j] = false;
        loading_timer = 0;  //no loading yet
        unloading_timer = 0;
     } //end constructor

//get current floor
int elevator::get_floor() const
     {
      return current_floor;
      }

//get current direction
 direction elevator::get_direction() const
      {
       return current_dir;
      }

//tick for each car
  void elevator::car_tick1()
       {
        car_display();
        dests_display();
        if(loading_timer)
           __loading_timer;
        if(unloading_timer)
           __unloading_timer;
        decide();
        }

//All cars must decide before any of them move
  void elevator::car_tick2()
       {
       move();
       }

  //display elevator image
  void elevator::car_display()
       {
       set_cursor_pos(SPACING+(car_number+)*SPACING, NUM_FLOORS-old_floor);
       cout << " ";   //erase old position
       set_cursor_pos(SPACING-1(car_number+)*SPACING, NUM_FLOORS-current_floor);

     switch(loading_timer)
         {
         case 3:
             cout << "\x01\xDB \xDB ";  //draw a car with open door
             break;
         case 2:
             cout << " \xDB \x01\xDB"; 
             get_destinations();
             break;
         case 1:
             cout << "\xDB\xDB\xDB "; //draw a car with closed door
             break;
         case 0;
             cout << "\xDB\xDB\xDB"; //closed door
             break;
           }

 set_cursor_pos(SPACING+(car_number+1)*SPACING,NUM_FLOORS-current_floor);
        
   switch(unloading_timer)
      {
       case 3:
          cout << "\xDB\x01\xDB";
          break;
       case 2:
          cout << "\xDB\xDB\x01";
          break;
       case 1:
          cout << "\xDB\xDB\xDB";
          break;
       case 0:
          cout << "\xDB\xDB\xDB";
          break;
       }
//display destinations
  void elevator::dests_display() const
      {
      for(int j=0; j<NUM_FLOORS; j++)
         {
          set_cursor_pos(SPACING-2+(car_number+1)*SPACING,NUM_FLOORS-j);
          if(destination[j] == true)
              cout << "\xFE';    //small box
          else
              cout << "";
          }
       }
//Decide what to do
   void elevator::decide()
        {
         int j;
    
          bool destins_above, destins_below;  //destinations
          bool requests_above, requests_below;  //requests

          int nearest_higher_req = 0;
          int nearest_lower_req = 0;

          bool car_between_up,car_between_dn;
          bool car_opposite_up, car_opposite_dn;

          int ofloor;
          direction odir;

   //Ensure we don't go too high or too low
  if((current_floor==NUM_FLOORS-1 && current_dir==UP) || (current_floor==0 && current_dir==DOWN)
    current_dir = STOP;

 // if there a destination on this floor ,unload pasengers
if(destination[current_floor]==true)
     {
     destination[current_floor] = false;
     if(!unloading_timer)
         unloading_timer = LOAD_TIME;
     return;
}

//check if there is an UP floor request on this floor
 if((ptrBuilding->get_floor_req(UP, current_floor) && current_dir !=DOWN))
    {
     current_dir = UP;
     ptrBuilding->set_floor_req(current_dir,current_floor,false);
//load
   if(!loading_timer)
     loading_time = LOAD_TIME;
   return;
     }

//check if there is an DOWN floor request on this floor
 if((ptrBuilding->get_floor_req(DOWN, current_floor) && current_dir !=UP))
    {
     current_dir = DOWN;
     ptrBuilding->set_floor_req(current_dir,current_floor,false);
//load
   if(!loading_timer)
     loading_time = LOAD_TIME;
   return;
     }

//check if there are other destinations or requests
  destins_above = destins_below = false;
  requests_above = requests_below = false;
    for(j=current_floor+1; j<NUM_FLOORS; j++)
       {
        if(destination[j])
            destins_above = true;
        if(ptrBuilding->get_floor_req(UP,j) || ptrBuilding->get_floor_req(DOWN,j))
             {
              requests_above = true;
        if(!nearest_higher_req)
            nearest_higher_req - j;
       }
     }

//check fllors below
   for(j=current_floor-1; j=>0; j--)
        {
       if(destination[j])
             destins_below = true;
       if(ptrBuilding->get_floor_req(UP,j) || ptrBuilding->get_floor_req(DOWN,j)
           {
            requests_below = true;
       if(!nearest_lower_req)
          nearest_lower_req = j;
         }
     }
 
//if no request or destinations DOWN or Up ,STOP the system
  if(!destins_above && !requests_above && !destins_below && !requests_below)
         {
          current_dir = STOP;
          return;
          }

//Go toward destination if stopped or already moving
   if(destins_above && (current_dir==STOP || current_dir==UP))
       {
        current_dir = UP;
        return;
        }
if(destins_below && (current_dir==STOP || current_dir==DN))
        {
         current_dir = DOWN;
         return;
         }

//Find if there cars going in the same direction between us and the nearest floor

  car_between_up = car_between_down = false;
  car_opposite_up = car_opposite_DOWN = false;

  //check the car
  for(j=0; j<NUM_CARS; j++)
       {
       if(j !=car_number)
           {
            ofloor = ptrBuilding->get_car_floors(j);
            odir = ptrBuilding->get_cars_dir(j);

  //if it going up and there is arequest above us
   if((odir==UP || odir==STOP) && requests_above)

      // if it above us and thebelow the nearest request
     if((ofloor>current_floor && ofloor <= nearest higher req) || (ofloor==current_floor && j<car_number)) 
     car_between_dn = true;

//if it going and there is a request above us
   if((odir==UP || odir==STOP) && requests_below)
  
//it a below request and closer to it than we are
    if(nearest_lower_req>=ofloor && nearest_low_req - ofloor<current_floor - nearest_lower_req)
    car_opposite_up = true;

//if it going DOWN and there is arequest above us
   if((odir==DOWN || odir==STOP) && requests_above)

      // if it above us and thebelow the nearest request
     if(ofloor >=nearest_higher_req && ofloor - nearest_higher_req<nearest_higher_req - current_floor) 
     car_opposite_down = true;

      }
  }
  
//if we are going down or stopped and there is a FR 
//No other cars going down between us and the FR
   if(current_dir==DOWN || current_dir==STOP) && requests_below && !car_between_down && !car_opposite_up)
        {
         current_dir = DOWN;
         return;
         }

//if nothing else happening stop
   current_dir = STOP;
    }
//....end decide() finally artificiall intelligence


//if loading or unloading
  void elevator::move()
       {
       if(loading_timer || unloading_timer)  //don't move
         return;
       if(current_dir==UP) //if it going up,go up
        current_floor++;
   }
//end move

//stop ,get destination
  void elevator::get_destinations()
        {
         char ustring[BUF_LENGTH];
         int dest_floor'

         set_cursor_pos(1,22); clear_line();
         set_cursor_pos(1,22)
         cout << "Car" << (car_number+1) << "has stopped at floor" << (current_floor+1) << "\n Enter the destination floors (0 when finished)";
     
         for(int j=1; j<NUM_FLOORS; j++)
             {
              set_cursor_pos(1,24);
              cout << "Destination" << j << ":";

              cin.get(ustring,BUF_LENGTH);
              cin.ignore(10,"\n");
              dest_floor = atoi(ustring);
              set_cursor_pos(1,24);

         if(dest_floor==0)
             {
              set_cursor_pos(1,22); clear_line();
              set_cursor_pos(1,23); clear_line();
              set_cursor_pos(1,24); clear_line();
              return;
              }

--dest_floor;
if(dest_floor==current_floor)
    { --j; continue; }

if(j==1 && current_dir==STOP)
    current dir = (dest floor <current floor) ? DOWN : UP;
  destination[dest_floor] = true;
  dests_display();
 }
}

//This the end of the code
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