/**

method 2.0 - illiustration of more methods

To do:

1. complete the "check" method for three player with full document

2. create method to generate a symbol for computer and use it in the

twoPlayers andthreePlayers

3. complete the fourthPlayers method. Make sure

the game keep going until a winner is found for all intermediate round

4. use the same logic we discussed, handle 5-players game

*/

import java.util.*;

public class Mar30Methods{

static Scanner keyboard = new Scanner(System.in);

public static void main(String[] args){

//get number of player

int players = getInt("Enter a number between 2 and 7:");

System.out.println("You entered: " + players );

switch (players){

case 2:

twoPlayers();

break;

case 3:

threePlayers();

break;

case 4:

fourPlayers();

break;

}

}//main

/** get an positive int

@param prompt a string to send to the user

@return a positive int

*/

private static int getInt(String prompt){

int input;

System.out.print(prompt);

input = keyboard.nextInt();

keyboard.nextLine(); //clear input buffer

return input;

}

/**

prompt and get a valid character (R,P,S, Q) form user

@param none

@return a character in [R,P,S,Q]

*/

private static char chooseSymbol(){

char input;

while(true){

System.out.print("Choose a symbol:[R,P,S] or (Q to quit):");

input = keyboard.nextLine().trim().toUpperCase().charAt(0);

/* first logic

if(input != 'R' && input != 'P' && input != 'S' && input != 'Q'){

System.out.println("Invalid input, try again");

continue;

}

break; //get out of the loop

*/

if(input == 'R' || input == 'P' || input == 'S' || input == 'Q'){

break; //got a valid character, break the loop

}

System.out.println("INVALID input, try again!");

}

return input;

}

/** return a number representing which player won

@param c first player symbol

@param x second player symbol

@return 0 if tie, 1 if first won, 2 if second won

*/

private static int check(char c, char x){

int winner = 0; //assume there is tie to start with

if((c == 'R' && x == 'S') || (c == 'P' && x == 'R') ||

(c == 'S' && x == 'P') ){

winner = 1; // first player wins

}else if(( x == 'R' && c == 'S') || (x == 'P' && c == 'R') ||

(x == 'S' && c == 'P') ){

winner = 2;//second player wins

}

return winner;

}

/** ...*/

private static int check(char x, char y, char z){

int winner = 0; //tie

if((x == 'R' && y == 'S' && z == 'S') ||

(x == 'P' && y == 'R' && z == 'R') ||

(x == 'S' && y == 'P' && z == 'P')){

winner = 1;

}

// continue for other two players

return winner;

}

/**

handle 2-player game

*/

private static int twoPlayers(){

char player1 = chooseSymbol();

char player2 = chooseSymbol();//make it computer

System.out.println("Player 1: " + player1 + " vs Player 2: " + player2);

int result = check(player1, player2);

if(result == 0){

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

}else if(result == 1){

System.out.println("Player 1 wins");

}else{

System.out.println("Player 2 wins");

}

return result;

}

/**

handle 3 players

*/

private static int threePlayers(){

char player1 = chooseSymbol();

char player2 = chooseSymbol();//should generate the symbol

char player3 = chooseSymbol();//should generate the symbol

int result = check(player1, player2, player3);//check winner

if(result == 0){

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

}else if(result == 1){

System.out.println("Player 1 wins");

}else if(result == 2){

System.out.println("Player 2 wins");

}else{

System.out.println("Player 3 wins");

}

return result;

}

/**

handle 4 players

*/

private static int fourPlayers(){

int winner = 0;

int winnerR1 = 0; //assume there is a tie in round 1

//play until some one win

System.out.println("Elimination round 1");

do{

winnerR1 = twoPlayers(); //player 1 vs player 2

}while(winnerR1 == 0);

//play until some one win

System.out.println("Elimination round 2");

//put your logic here

return winner;

}

}//end of class