Need help to modify code; modified code needs to be able to play computer vs com
ID: 3584315 • Letter: N
Question
Need help to modify code; modified code needs to be able to play computer vs computer, player vs player, player vs computer, under code is proper output, in which modifed code should produce.
import java.util.Scanner;
public class SimpleNIM {
private int sticksLeft = 16;
private String player = "B";
/**
* Plays the game
* @param args ignored
*/
public static void main(String[] args) {
// we can call a static method before/without instantiating an object
welcome();
// instantiate an object named pickUpSticks of class SimpleNIM
SimpleNIM pickUpSticks = new SimpleNIM();
// we can only call a non-static method via reference to an object name
pickUpSticks.start();
}
/**
* Displays the startup information banner.
*/
private static void welcome() {
System.out.println("WELCOME TO THE SIMPLE NIM GAME: 21 STICKS IN PILE");
}
/**
* Starts and runs the game
*/
public void start() {
Scanner input = new Scanner(System.in);
do {
int picksticks = 0;
boolean goodEntry = false;
player = otherPlayer(player);
do {
System.out.print(
"Player " + player +
": How many sticks do want to pick? (1, 2, or 3) ");
picksticks = input.nextInt();
if (validMove(picksticks)) {
goodEntry = true;
}
else {
System.out.println(
sticksLeft - picksticks < 0
? "You can't pick "
+ picksticks
+ " sticks as only "
+ sticksLeft
+ " sticks left"
: "That's an illegal move. "
+ "Choose 1, 2, or 3 sticks.");
}
}
while (!goodEntry);
updateSticksLeft(picksticks);
System.out.println(
"Player "
+ player
+ " takes "
+ picksticks
+ ( (picksticks == 1) ? " stick, " : " sticks, ")
+ "leaving "
+ sticksLeft
+ ' ');
}
while (gameOver() != true);
System.out.println("Player " + otherPlayer(player) + " wins the game!");
}
/**
* Update the number of sticks left in pile.
* @param picksticks No. of sticks picked
*/
private void updateSticksLeft(int picksticks) {
sticksLeft = sticksLeft - picksticks;
}
/**
* Game Over?
* @return true if game is over.
*/
private boolean gameOver()
{
if(sticksLeft == 0) return true;
else return false;
}
/**
* Returns the other player
* @param p The current player ("B" or "A")
* @return The other player ("A" or "B")
*/
private String otherPlayer(String p) {
if (p== "A") return "B";
else return "A";
}
/**
* Valid move?
* @param numSticks The number of sticks picked
* @return true iff there are enough sticks left and numSticks is between 1 and 3
*/
private boolean validMove(int numSticks) {
if (numSticks > 0)
{
if (numSticks < 4)
{
return true;
}
else return false;
}
// numSticks was less than or equal to 1 so return false
return false;
}
}
Explanation / Answer
Try this. This might be the error you are facing!! private boolean validMove(int numSticks) { // YOUR CODE GOES HERE if (numSticks > 1) { if (numSticks < 3) { return true; } else return false; } // numSticks was less than or equal to 1 so return false return false; } replace this in your code!! import java.util.Scanner; /** *Original authors Namita Singla, Robert Cohen
*Modified by Bob Wilson, 08/19/2005
* *The simple NIM game.
* There are 21 sticks in the pile. On each move, each user take turns picking * up 1, 2, or 3 sticks until there are no more sticks left. * The one who picks up the last stick loses.
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