Bouncing Ball Graphics Program in C++

Bouncing Ball  Graphics Program in C++ 

#include<iostream>
#include<graphics.h>
#include<dos.h>
 using namespace std;
   void gotoxy(short x, short y)           //definition of gotoxy function//
    {
     COORD pos ={x,y};
     SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), pos);
   }
   void Delay(int dl){
      for(int i= 0; i <= 10000; i++){
        for(int j =0 ; j <= dl; j++){
        }
      }
    }
    int dl, x = 300, y = 400, flag;
    void t1(){
        if(y == 13 ){
            flag = 2;
        }
        if(y == 450)
            flag = 8;
    }
    void Main(int f){
        switch(f)
          {
            case 2:
                    y+=1;
                    dl = 60;
                    break;
            case 8:
                    y-=1;
                    dl = 60;
                    break;
            }
        Delay(dl);
        cleardevice();
        t1();
        circle(x,y,30);
        settextstyle(GOTHIC_FONT,HORIZ_DIR,1);
        outtextxy(350,450,"Press Esc key to exit.");
  }

  int main()
   {
        int gd = DETECT, gm ;
        initgraph(&gd,&gm,"");
        settextstyle(TRIPLEX_FONT,HORIZ_DIR,4);
        outtextxy(60,200,"Press any key to start.");
        getch();
        flag = 8;
        while(1){
            if(kbhit()){
                //for Exit
                if(getch() == 27)
                  break;
            }
         Main(flag);
        }
    getch();
    return 0;
   }

Output :-