A89: Help debugging program...

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A89: Help debugging program...

Hi. Sorry to have to keep asking this, but can someone help me debug my C 
program? It's just a very simple game (very early demo right now) in which 
you must dodge the oncoming balls. The balls drop straight down, and after 
the first ball drops 10 pixels, then a second one drops down (in a different 
location). Right now only one ball drops down at a time, but I'll add more in 
the final version. For some reason, the sprites are displayed wrong and the 
program doesn't erase the old sprite before replacing it with a new one (when 
the balls drop and you (the ship) move, it makes a line). Also, once I press 
an arrow key to move the ship, it just continues on in that direction until 
it loops around the screen and then starts again, but only 1 pixel higher and 
just makes a black line, as do the balls. I've been trying to debug this for 
a few hours, but as soon as I solve one problem, more arise. Maybe if someone 
else looks at it they'll see the bug(s). Keep in mind that I'm only a 
beginner, and this is my first C game (sorry for the long e-mail) :)

Thanks,

        Josh
        <A HREF="http://pa.ticalc.org">Programmers Anonymous</A> Member

#include <nostub.h>
#include <printf.h>
#include <kbd.h>
#include <graph.h>
#include <system.h>

int _ti89;

unsigned int rand_seed=0;
static int highscore=0;
int score=0;


int random(int x)           
{
  return ((rand_seed=(75*rand_seed+1))>>4)%x;
}

void end(int score)
{
	ClrScr();
	printf_xy(0,0,"Game Over");
	if(score>highscore)
	{
		highscore=score;
		printf_xy(0,5,"New High Score of %d!",score);
	}
}

void _main(void)
{
int ball_x[10]={0,0,0,0,0,0,0,0,0,0};
int ball_y[10]={0,0,0,0,0,0,0,0,0,0};
int ship_x=72;
int ship_y=84;
int key_value=0;
int count=0;

 int  ball[16] = { 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x03C0,
 0x07E0,
 0x0FF0,
 0x0FF0,
 0x0FF0,
 0x0FF0,
 0x07E0,
 0x03C0,
 0x0000,
 0x0000,
 0x0000,
 0x0};


 int ship[16] = { 0x0180,
 0x03C0,
 0x07E0,
 0x0FF0,
 0x1FF8,
 0x3FFC,
 0x7FFE,
 0xFFFF,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0};


 int blank[16] = { 0x0000,
 0x0000,
 0x0000,            
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0000,
 0x0};

ICON* ball_pt=&ball[0];
ICON* ship_pt=&ship[0];
ICON* blank_pt=&blank[0];



	ClrScr();
	printf_xy(0,0,"Dodge-Em's v0.1");
        printf_xy(0,10,"by Josh Hill");
	ngetchx();
        GKeyFlush();
        DrawIcon(ship_x,ship_y,ship_pt,A_REPLACE);

while(1)
{

	ball_x[0]=random(149);
        ball_y[0]=-5;

for(count=1;count<=10;count++)
{
        DrawIcon(ball_x[0],ball_y[0]++,blank_pt,A_REPLACE);
        DrawIcon(ball_x[0],ball_y[0],ball_pt,A_REPLACE);
	if((ball_x[0]+12>=ship_x && ball_x[0]-4>=ship_x+8) && (ball_y[0]+8>=ship_y && ball_y[0]-8<=ship_y+16))
		end(score);

        key_value=kbhit();
	GKeyFlush;
        if(key_value!=0)
	{
                if(key_value==344)
		{
                        DrawIcon(ship_x++,ship_y,blank_pt,A_REPLACE);
                        DrawIcon(ship_x,ship_y,ship_pt,A_REPLACE);
		}
                if(key_value==338)
		{
                        DrawIcon(ship_x--,ship_y,blank_pt,A_REPLACE);
                        DrawIcon(ship_x,ship_y,ship_pt,A_REPLACE);
		}
                if(key_value==264)
                        end(score);
                if(key_value==263)
			off();
		}


        if(ball_x[0]+4==100) score+=100;
}
}

}