Typing practice with bubble game

Many of us played this game in typing tutor. Bubbles are falling from the top containing a  character in it. We need to type that character to make that bubble disappear.
Same is here but there is no termination condition or scoring.
To terminate the code press ESC key.

Preview:

//Typing practice with bubble game #include<stdio.h> #include<conio.h> #include<iostream.h> #include<stdlib.h> #include<dos.h> #include<graphics.h> #include<string.h> class typing { char ch,arrch[10]; int time; static int count; int arrx[10],arry[10]; public: typing() { int i; time=500; ch='0'; for(i=0;i<10;i++) { arrx[i]=0; arry[i]=0; arrch[i]='0'; } } void random_char() { int r_x,r_y=15,i; static int last_x=0; count++; char r_ch; do { r_x=random(10); r_x++; r_x=r_x*45+15; } while(last_x==r_x); r_ch=random(26); r_ch+=97; for(i=0;i<10;i++) { if(arrx[i]==0&&arry[i]==0&&arrch[i]=='0') { arrx[i]=r_x; arry[i]=r_y; arrch[i]=r_ch; last_x=r_x; break; } } } void draw_char() { int i; //char *p; cleardevice(); setfillstyle(1,7); bar(0,0,520,480); setfillstyle(1,3); bar(520,0,640,480); for(i=0;arrch[i]!='0'&&i<10;i++) { if(!(arrx[i]==0&&arry[i]==0&&arrch[i]=='0')) { char *p='\0'; setfillstyle(1,15); setcolor(0); fillellipse(arrx[i],arry[i]+=15,15,15); fflush(stdin); *p=arrch[i]; settextstyle(1,0,1); outtextxy(arrx[i]-5,arry[i]-10,p); } } } void arrange(int pos) { int i; for(i=pos+1;arrch[i]!='0'&&i<10;i++) { arrch[i-1]=arrch[i]; arrx[i-1]=arrx[i]; arry[i-1]=arry[i]; } arrch[i-1]='0';arrx[i-1]=arry[i-1]=0; } void start() { int i; do { do { if(count<10) random_char(); draw_char(); delay(time); if(arry[0]>=480-15) { arrange(0); count--; } } while(!kbhit()); ch=getch(); for(i=0;i<10;i++) { if(ch==arrch[i]) { arrange(i); count--; break; } } } while(ch!=27); } }; int typing::count=0; void main() { clrscr(); int gd=0,gm,errorcode; typing t; initgraph(&gd,&gm,"c:\\turboc3\\bgi"); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } randomize(); t.start(); }