I am new to JAVA and wrote a Nim game project, which includes Nimsys and Nimplayer.
Everything seems fine. When I run through the test file, the result is CORRECT.
However, when it goes to playing again, there's an extra space suddenly shows up, and I cannot
figure it out. There could be some mistakes. Any help is highly appreciated.
The test results
import java.util.Scanner;
public class Nimsys {
int stoneBalance;
public static void main(String[] args) {
String playOrNot;
Scanner input = new Scanner(System.in);// Scanner
System.out.println("Welcome to Nim\n");
// bring two players in the main.
System.out.println("Please enter Player 1's name:");
NimPlayer player1 = new NimPlayer(); // bring player1 object to be used
String name1 = input.nextLine(); // set the string's name to be used
System.out.println("");
NimPlayer player2 = new NimPlayer(); // bring player2 object to be used
System.out.println("Please enter Player 2's name:");
String name2 = input.nextLine();
System.out.println("");
do {
// stone upper bound
System.out.println("Please enter upper bound of stone removal:");
int removeUpBound = input.nextInt();
System.out.println("");
// intital stone numbers
System.out.println("Please enter initial number of stones:");
int totalStone = input.nextInt();
System.out.println("");
NimPlayer numStone = new NimPlayer(); // bring new object to be used
numStone.initialStone(totalStone);
System.out.print(numStone.stoneBalance + " stones left:");
numStone.printStar(totalStone);
// while stoneBalance > 0, two players keep playing the game
while (numStone.stoneBalance > 0) {
// player1's turn and remove the stones; decision of winning
player1.enterName(name1); // pass the name to be used
player1.player1Turn();
int takeStone = input.nextInt();
while (takeStone > removeUpBound || takeStone <= 0) {
System.out.println(
"Invalid, you need to remove stones under upper bound limit or above 0. \n Please enter again.");
takeStone = input.nextInt();
}
numStone.removeStones(takeStone);
if (numStone.stoneBalance > 0) {
System.out.print(numStone.stoneBalance + " stones left:");
numStone.printStar(numStone.stoneBalance);
} else if (numStone.stoneBalance <= 0) {
System.out.println("Game Over\n" + name2 + " wins!\n");
break;
}
// player2's turn and remove the stones; decision of winning
player2.enterName(name2); // pass the name to be used
player2.player2Turn();
int takeStone2 = input.nextInt();
while (takeStone2 > removeUpBound || takeStone2 <= 0) {
System.out.println(
"Invalid, you need to remove stones under upper bound limit or above 0. \n Please enter again.");
takeStone2 = input.nextInt();
}
numStone.removeStones(takeStone2);
if (numStone.stoneBalance > 0) {
System.out.print(numStone.stoneBalance + " stones left:");
numStone.printStar(numStone.stoneBalance);
} else if (numStone.stoneBalance <= 0) {
System.out.println("Game Over\n" + name1 + " wins!\n");
break;
}
}
System.out.println("Do you want to play again (Y/N):");
playOrNot = input.next();
} while (playOrNot.equals("Y"));
}
}
public class NimPlayer {
String player1;
String player2;
int stoneBalance;
int stars;
public void enterName(String name) {
player1 = name;
player2 = name;
}
public void initialStone(int startStones) {
stoneBalance = startStones;
}
public void removeStones(int stonesTaken) {
int updatedBalance = stoneBalance - stonesTaken;
stoneBalance = updatedBalance;
}
public void player1Turn() {
System.out.println(player1 + "'s turn - remove how many?\n");
}
public void player2Turn() {
System.out.println(player2 + "'s turn - remove how many?\n");
}
public void printStar(int star) {
stars = star;
stars = stoneBalance;
for (int stars = 1; stars <= star; stars++) {
System.out.print(" *");
}
System.out.println();
}
}
To entirely fix your 2 issues I would do the following -
input.nextLine();
System.out.println("Do you want to play again (Y/N):");
playOrNot = input.nextLine();
Instead of
System.out.println("Do you want to play again (Y/N):");
playOrNot = input.next();
Related
I'm trying to start the game over if the user enters "Yes". I tried using a while loop, but it's gone wrong somewhere that I can't find.
import java.util.Scanner;
import java.util.Random;
public class RockPaperScissors {
public static void main(String[] args) {
int playerScore = 0;
int computerScore = 0;
int round = 0;
String decision;
// Get user input
while (round<3) {
System.out.println("Please enter your move: Rock, Paper or Scissors");
System.out.println(">>");
Scanner input = new Scanner(System.in);
String playerMove = input.next();
// Check if user input is valid
if (!playerMove.equalsIgnoreCase("Rock") && !playerMove.equalsIgnoreCase("Paper") && !playerMove.equalsIgnoreCase("Scissors")) {
System.out.println("Move is invalid, Opponent gets a point");
computerScore++;
round++;
System.out.println("Your point is "+ playerScore + "; Opponent score is "+ computerScore);
} else {
// Randomly generate computerMove
int computerInt = (int)(Math.random()*3);
String computerMove = " ";
if (computerInt == 0) {
computerMove = "Rock";
} else if (computerInt == 1) {
computerMove = "Paper";
} else if (computerInt == 2) {
computerMove = "Scissors";}
System.out.println("Opponent move is "+ computerMove);
// Establish winning or losing scenarios
if (playerMove.equalsIgnoreCase(computerMove)) {
System.out.println("Tied");
round++;
System.out.println("Your point is "+ playerScore + "; Opponent score is "+ computerScore);
} else if (playerMove.equalsIgnoreCase("Rock") && computerMove.equalsIgnoreCase("Scissors") ||
playerMove.equalsIgnoreCase("Scissors") && computerMove.equalsIgnoreCase("Paper") ||
playerMove.equalsIgnoreCase("Rock") && computerMove.equalsIgnoreCase("Paper")) {
System.out.println("You won");
playerScore++;
round++;
System.out.println("Your point is "+ playerScore + "; Opponent score is "+ computerScore);
}
else {
System.out.println("You lost");
computerScore++;
round++;
System.out.println("Your point is "+ playerScore + "; Opponent score is "+ computerScore);
}
}
// Determine the last winner
if (playerScore < computerScore) {
System.out.println("You lose, so sad ;(");
} else if (playerScore > computerScore) {
System.out.println("You win, here's a cookie ;) ");
} else {
System.out.println("Tied, maybe try harder ^_^"); }
}
System.out.println("Do you wanna play again?");
}
}
}
Sounds like this might be a HW or Test question, so just writing steps to help you out:
first have a user-decision variable and initialize it to "Y"
then put the game in a while(user-decision="Y") loop
at the end of this loop ask the user for their decision and update the user-decision variable to either Y or N
if they say Y loop continues, else it ends
if you need to repeat your code, put it in a new class (Game) and instantiate in main () and call until your Game class returns TRUE (press Y)
package appMain;
import java.util.Scanner;
public class Game {
public Boolean PlayGame() {
System.out.println("START GAME");
//
// >> PUT THERE YOUT GAME CODE <<
//
Scanner input = new Scanner(System.in);
String answer = input.next();
if(answer.equals("Y")) {
return true;
}
return false;
}
}
package appMain;
public class GameMain {
public static void main(String args[]) {
Game game = new Game();
while (game.PlayGame()) {
}
System.out.println("GAME finish");
}
}
This is my nim game (goal is dont be the last person to pick up marbles), can someone please guide me. In playing the game, I have just one question
How can I keep track of whose turn it is, I guess if I can keep track of that I can monitor my remainingMarbles. This is the crux of my code. Please help
public class Nim{
public static void main(String[] args)
{
System.out.println("************** Welcome to the game of Nim *******************");
System.out.println("The object of this game is to make me take the last marble off the table");
System.out.println("You must take at least 1 and you can take up to 3 marbles on your turn");
System.out.println("You can go first");
Scanner scan = new Scanner(System.in);
final int MARBLES = 13;
int remainingMarbles;
String input;
do {
//boolean whoseTurn = true;
remainingMarbles = MARBLES;
System.out.println("There are " + MARBLES + " marbles on the table");
while (remainingMarbles > 0){
remainingMarbles -= getUserSelection();
System.out.println("There are " + (remainingMarbles -= getComputerSelection()) + " marble(s) on the table.");
}
if (1 <= remainingMarbles && remainingMarbles <= 2 && remainingMarbles < 0) {
System.out.println("Congratulations! you won!");
System.out.println("Want to play again? y/n");
input = scan.nextLine();
input = input.toLowerCase();
} else
System.out.println("Hard luck you lose!");
System.out.println("Want to play again? y/n");
input = scan.nextLine();
input = input.toLowerCase();
}while (input.charAt(0) == 'y');
}
private static int getUserSelection()
{
Scanner scan = new Scanner(System.in);
do {
System.out.println("Enter 1, 2 or 3");
int userSelection = scan.nextInt();
if (isValidMove(userSelection)){
return userSelection;
}
else {
System.out.println("Not a valid entry");
}
}while (true);
}
private static boolean isValidMove(int input)
{
return 1 <= input && input <= 3;
}
private static int getComputerSelection ()
{
Random generator = new Random();
int computerSelection = 1 + generator.nextInt(3);
System.out.println("The computer chooses " + computerSelection);
return computerSelection;
}
}
First, make a boolean before the loop.
boolean whoseTurn = true;
When the variable is true it's the first player's turn, otherwise the second player's turn.
Now inside the while loop we change the variable at the end of every repetition:
whoseTurn = !whoseTurn;
(Which is a faster way of this)
if(whoseTurn) whoseTurn = false;
else whoseTurn = true;
To conclude, you should do something like that:
...
boolean whoseTurn = true;
while(remainingMarbles > 0){
remainingMarbles -= getUserSelection();
System.out.println("There are " + (remainingMarbles -= getComputerSelection()) + " marble(s) on the table.");
whoseTurn = !whoseTurn;
}
...
Our task was to create a guessing game, where the computer would generate a number and the user was prompted to guess. We were to create a method to play only one game, and then create a while loop in the main to make the game playable again. In the end, we need to show statistics. I'm having trouble with showing the "best game." That is a game where the amount of guesses is the least.
Here is the code:
import java.util.Random;
import java.util.Scanner;
public class GuessingGame {
public static final int MAX = 100;
// This is the main. Here we can see a do/while loop
// and a few variables that were created to compliment it.
public static void main(String[] args) {
Random rand = new Random();
Scanner console = new Scanner(System.in);
intro();
String s = "";
int totalGames = 0;
int totalGuess = 0;
do {
totalGuess = game(console);
System.out.print("Do you want to play again? ");
s = console.next();
totalGames++;
} while (s.equals("y") || s.equals("Y") || s.equals("Yes") ||
s.equals("yes") || s.equals("Yes"));
totalGuess = totalGuess;
statistics(totalGames, totalGuess);
}
// This method prints out the intro.
public static void intro() {
System.out.println("This program allows you to play a guessing
game.");
System.out.println("I will think of a number between 1 and");
System.out.println(MAX + " and will allow you to guess until");
System.out.println("you get it. For each guess, I will tell you");
System.out.println("whether the right answer is higher or lower");
System.out.println("than your guess.\n ");
}
// This method plays the game only once. It's later used in the main.
// Returns the
// number of guesses for one game.
public static int game(Scanner console) {
Random rand = new Random();
int random = rand.nextInt(MAX) + 1;
System.out.println("I'm thinking of a number between 1 and " + MAX + "
... (it's " + random + " )");
System.out.print("Your guess? > ");
int guess = console.nextInt();
int count = 0;
do {
if ((random - guess) > 0) {
System.out.println("It's higher.");
System.out.print("Your guess? > ");
guess = console.nextInt();
count++;
}
else if ((random - guess) < 0) {
System.out.println("It's lower.");
System.out.print("Your guess? > ");
guess = console.nextInt();
count++;
}
else if (random == guess) {
count++;
}
} while (random != guess);
if (count == 1) {
System.out.println("You got it right on the first guess!!");
}
else {
System.out.println("You got it right in " + count + " guesses.");
}
return count;
}
// This method prints out the statistics.
public static void statistics(int x, int y) {
System.out.println("total games = " + x);
System.out.println("total guesses = " + (y));
System.out.println("guesses/game = ");
System.out.println("best game = ");
}
}
Have a look when totalGuess is assigned:
public static void main(String[] args) {
Random rand = new Random();
Scanner console = new Scanner(System.in);
intro();
String s = "";
int totalGames = 0;
int totalGuess = 0;
// ^ Initialized to zero
do {
totalGuess = game(console);
// ^ Assigned (not added) to the return value from game.
// Did you mean: totalGuess += game(console); ?
System.out.print("Do you want to play again? ");
s = console.next();
totalGames++;
} while (s.equals("y") || s.equals("Y") || s.equals("Yes") ||
s.equals("yes") || s.equals("Yes"));
totalGuess = totalGuess;
// ^ Assigned to itself. No action.
statistics(totalGames, totalGuess);
}
I am writing a program that will ask the user to guess a random number 6 times. The program has to ask if they want to play again and will keep a running total of the wins/losses.
How would I have the program rerun?
heres the code:
import java.util.Scanner;
import java.util.Random;
public class Project {
public static void main(String[] args) {
String input;
double guess = 0;
int number;
double wins = 0;
double losses = 0;
String repeat;
Scanner keyboard = new Scanner(System.in);
Random randomNumbers = new Random();
System.out.println("Welcome to Higher/Lower!");
System.out.println("Enter your name: ");
input = keyboard.nextLine();
while(input.equalsIgnoreCase("yes")); {
number = randomNumbers.nextInt(100) + 1;
System.out.println("I've chosen my number, " + input + "You only have 6 tries, good luck!"); }
for(int num = 1; number != guess && number <= 6; num++) {
System.out.println("Enter guess " + num + ":");
guess = keyboard.nextDouble();
if(guess < number)
System.out.println("higher.");
else if(guess > number)
System.out.println("lower.");
else
System.out.println("Congratulations!"); }
if(guess == number) {
System.out.println("You guesses my number!"); wins++; }
if(guess != number) {
System.out.println("Sorry, " + input + " my number was " + number +
"You lose!"); losses++; }
System.out.println("Do you want to play again? (Yes/No): ");
repeat = keyboard.nextLine();
if(input.equalsIgnoreCase("no")); {
System.out.println("Thanks for playing!"); }
System.out.println(wins + " wins");
System.out.println(losses + " losses");
}
}
It is skipping over asking me if i want to play again or not and i dont know what kind of loop to use
Wihtout your code, I'm assuming this is what you need.
boolean doContinue = true;
do {
//guess random number 6 times
//do you want to continue?
// yes -> doContinue = true;
// no -> doContinue = false;
} while (doContinue );
I would suggest making your loop a do-while loop like this:
do {
for (int i=0; i<6; i++){
/*
insert code for the guessing/checking/etc.
*/
}
System.out.print("Would you like to continue? [Y/n] ");
} while (scan.next().toUpperCase().charAt(0) != 'Y');
For my assignment I'm supposed make the program rock paper scissors which I figured that out my main problem is I can't get the program to play again right or get the program to calculate the game scores correctly pleas help I'm going crazy trying to figure this out?!
//Tayler Dorsey
import java.util.Random;
import java.util.Scanner;
public class PRS {
static Scanner keyboard = new Scanner(System. in );
public static void instructions() {
System.out.println("This is the popular game of paper, rock, scissors. Enter your\nchoice by typing the word \"paper\", the word \"rock\" or the word\n\"scissors\". The computer will also make a choice from the three\noptions. After you have entered your choice, the winner of the\ngame will be determined according to the following rules:");
System.out.println("Paper wraps rock (paper wins)\nRock breaks scissors (rock wins)\nScissors cuts paper (scissors wins)");
System.out.println("If both you and the computer enter the same choice, then the game is tied.");
}
public static int playGame() {
int ties = 0, wins = 0, losts = 0;
String userchoice, computerchoice;
System.out.println("Enter your choice: ");
userchoice = keyboard.next();
computerchoice = computerChoose();
System.out.println("You entered: " + userchoice);
System.out.println("Computer choose: " + computerchoice);
if ((userchoice.equals("paper") && computerchoice.equals("paper")) || (userchoice.equals("rock") && computerchoice.equals("rock")) || (userchoice.equals("scissors") && computerchoice.equals("scissors"))) {
System.out.println("IT'S A TIE!");
ties++;
return 3;
} else if ((userchoice.equals("paper") && computerchoice.equals("rock")) || (userchoice.equals("rock") && computerchoice.equals("scissors")) || (userchoice.equals("scissors") && computerchoice.equals("paper"))) {
System.out.println("YOU WIN!");
wins++;
return 1;
} else {
System.out.println("YOU LOSE!");
losts++;
return 2;
}
}
public static String computerChoose() {
Random generator = new Random();
String[] answer = new String[3];
answer[0] = "paper";
answer[1] = "rock";
answer[2] = "scissors";
return answer[generator.nextInt(3)];
}
public static void main(String[] args) {
String play;
Scanner keyboard = new Scanner(System. in );
System.out.println("The Game of Paper, Rock, Scissors");
System.out.println("Do you need instructions (y or n)?");
String help = keyboard.nextLine();
if (help.equals("y")) instructions();
int result = playGame();
System.out.println("Play again (y or n)?");
play = keyboard.nextLine();
if (play.equals("y"));
else {
int count = 0, wins = 0, losts = 0, ties = 0;
System.out.println("Games played: " + count);
System.out.println("Wins for you: " + wins);
System.out.println("Wins for me: " + losts);
System.out.println("Tied games: " + ties);
}
do {} while (play == "y"); {
playGame();
int count = 0;
count++;
}
}
}
There are two issues here:
The code isn't inside the do-while loop, it's after it.
String equality should be checked with equals not with ==.
So:
int count = 0;
do { // Note the code inside the do-while block
playGame();
count++;
} while (play.equals("y")); // Note the use of equals
Do the following:
do {
play = keyboard.nextLine();
if (play.equals("y")){
}
else {
int count = 0, wins = 0, losts = 0, ties = 0;
System.out.println("Games played: " + count);
System.out.println("Wins for you: " + wins);
System.out.println("Wins for me: " + losts);
System.out.println("Tied games: " + ties);
}
} while (play.equals("y"));
In order to calculate the games scores make those variable global.
public class PRS {
static Scanner keyboard = new Scanner(System. in );
int ties = 0, wins = 0, losts = 0;