图形错误，为什么程序崩溃？

Question

我正在尝试为类测试的每个对象创建一个栏。有一个私有变量，状态。如果条形的status == 0值变为红色，则将颜色更改为绿色。在for循环的多个输入之后，程序的图形窗口崩溃​​。请帮助我在哪里做错了？

/* bar example */ 


#include <iostream>
#include <graphics.h>
using namespace std;
#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

class test
{
    private:
        int x;
    public:
        test()
        {


        }   

    int getX()
        {
            if(x==0)
            {
                cout << "Room Empty";
            }
            else
            if (x==1)
            {
                cout << "Room Occupied";
            }
            return x;
        }

    void setX(int check)
        {
            x=check;
            this->update();

        }
    void update()
    {
        //Block to change the colour of the bar on the screen
        if(x==0)
            {
            setfillstyle(INTERLEAVE_FILL,RED);
            bar(100,100,20,20);

            }
            else
            if(x==1)
            {
            setfillstyle(INTERLEAVE_FILL,BLUE);
            bar(100,100,20,20);

            }
    }   

};

int main(void)

{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   int midx, midy, i;
   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");
   /* read result of initialization */
   errorcode = graphresult();

   if (errorcode != grOk) {   /* an error occurred */

      printf("Graphics error: %s\n", grapherrormsg(errorcode));



      printf("Press any key to halt:");

      getch();

      exit(0);               /* terminate with an error code */

   }
   int x;

   test object;
   for(int i=0;i<20;i++)
   {

   cout << "Enter 0 for red, 1 for Blue: ";

   cin >> x;


   object.setX(x);

   }


      //getch();

         /* clean up */

   closegraph();

   return 0;

   }