$//---------------------------------------------------------$

$//$ Dr$.$ Art Hanna

$//$ Chapter #$7,$ Problem #$28$

$//$ Problem$28.$java

$//$

$//$ Sample Program Dialog

$//=====================$

$//$ C:$\backslash$COURSES$\backslash$CS$2323\backslash$Assignments$\backslash$Chapter$7>$java Problem$2820$

$//1|$ H T $|$

$//2|$ T H $|$

$//3|$ T H $|$

$//4|$ T H $|$

$//5|$ T H $|$

$//6|*|$

$//7|$ T H $|$

$//8|$ T H $|$

$//9|$ T H$|$

$//$ Hare wins!

$//---------------------------------------------------------$

import java.util.Random;

public class Problem$28$

$\{$

private static Random RANDOM $=$ new Random$()$;

$//---------------------------------------------------------$

public static void main$($String$[]$ args$)$

$//---------------------------------------------------------$

$\{$

if $($ args.length $!=1)$

System.out.println$("$Format should be $\backslash "$java Problem$28$ n$\backslash "$

$")$;

else

$\{$

int n $=$ Integer.parseInt$($args$[0])$;

int harePosition $=1$;

int tortoisePosition $=1$;

int clock $=0$;

do

$\{$

clock$++$;

harePosition $=$ NewHarePosition$($harePosition$,$n$)$;

tortoisePosition $=$ NewTortoisePosition$($tortoisePosition$,$n$)$;

DisplayRacePositions$($n$,$clock,harePosition,tortoisePosition$)$;

$\}$ while $(($harePosition $<$ n$)$ && $($tortoisePosition $<$ n$))$;

if $(($harePosition $==$ n$)$ && $($tortoisePosition $<$ n$))$

System.out.println$("$Hare wins!"$)$;

else if $(($harePosition $<$ n$)$ && $($tortoisePosition $==$ n$))$

System.out.println$("$Tortoise wins!"$)$;

else

System.out.println$("$Tie$!")$;

$\}$

$\}$

$//---------------------------------------------------------$

private static int NewHarePosition$($int harePosition,final int n$)$

$//---------------------------------------------------------$

$\{$

switch $($ RANDOM.nextInt$(10)+1)$

$\{$

case $1$:

case $2$: harePosition $+=0$; break;

case $3$:

case $4$: harePosition $+=9$; break;

case $5$: harePosition $+=-12$; break;

case $6$:

case $7$:

case $8$: harePosition $+=1$; break;

case $9$:

case $10$: harePosition $+=-2$; break;

$\}$

if $($ harePosition $<1)$

harePosition $=1$;

if $($ harePosition $>$ n $)$

harePosition $=$ n;

return$($ harePosition $)$;

$\}$

$//---------------------------------------------------------$

private static int NewTortoisePosition$($int tortoisePosition,final int n$)$

$//---------------------------------------------------------$

$\{$

switch $($ RANDOM.nextInt$(10)+1)$

$\{$

case $1$:

case $2$:

case $3$:

case $4$:

case $5$: tortoisePosition $+=3$; break;

case $6$:

case $7$: tortoisePosition $+=-6$; break;

case $8$:

case $9$:

case $10$: tortoisePosition $+=1$; break;

$\}$

if $($ tortoisePosition $<1)$

tortoisePosition $=1$;

if $($ tortoisePosition $>$ n $)$

tortoisePosition $=$ n;

return$($ tortoisePosition $)$;

$\}$

$//---------------------------------------------------------$

private static void DisplayRacePositions$($final int n$,$final int clock,

final int harePosition,

final int tortoisePosition$)$

$//---------------------------------------------------------$

$\{$

char raceCourse$[]=$ new char $[$ n$+1]$;

for $($int i $=1$; i $<=$ n; i$++)$

raceCourse$[$i$]=\text{'}\text{'}$;

if $($ harePosition $!=$ tortoisePosition $)$

$\{$

raceCourse$[$ harePosition$]=\text{'}$H$\text{'}$;

raceCourse$[$tortoisePosition$]=\text{'}$T$\text{'}$;

$\}$

else

raceCourse$[$tortoisePosition$]=\text{'}*\text{'}$;

System.out.printf$("\%3$d $|",$clock$)$;

for $($int i $=1$; i $<=$ n; i$++)$

System.out.printf$("\%$c$",$raceCourse$[$i$])$;

System.out.println$("|")$;

$\}$

$\}$