Hi!
I have a problem with an unintentionally exiting of a while loop. I'm trying to do a simple tic tac toe program. When one player has won the game, for example three X:s in a row, the program says "X wins!". So far OK. And thereafter I want the program to say "Do you want to play? y(yes) or n(no): ". But this doesn't happen. The process is shut down ie the monitor says "Process completed" and I'm out of the program.
I've been trying all different kind of possibilities but nothing works. I would be very pleased if someone could take a look at this.
Thankyou, anders
Here is the Game class:
import java.util.Scanner;
import java.lang.Object;
class Game
{
public static void main(String args[])
{
String answer = "y";
int w ;
LuffarSchack t = new LuffarSchack();
Scanner scan = new Scanner (System.in);
while (answer.equalsIgnoreCase("y") )
{
System.out.println("Give position: " );
int pos = scan.nextInt();
System.out.println("Give player: " );
int player = scan.nextInt();
t.setVal(pos, player);
t.showGame();
w = t.winner();
if(w == 1)
{
System.out.println("X is wins!");t.resetGame();
System.out.println("Do you want to play? y(yes) or n(no): ");
answer = scan.nextLine();
}
if(w == 2)
{
System.out.println("O wins!");t.resetGame();
System.out.println(" Do you want to play? y(yes) or n(no):");
answer = scan.nextLine();
}
if(w == -1)
System.out.println("Next player!");
}
}
}and here is the tic tac toe class:
class LuffarSchack
{
private int s1,
s2,
s3,
s4,
s5,
s6,
s7,
s8,
s9;
public LuffarSchack()
{
/* initialize all squares to default value of 0 */
s1 = s2 = s3 = s4 = s5 = s6 = s7 = s8 = s9 = 0;
}
/*
Method: getVal(int square)
Parameters: square; the number of a square
Return value: int; the value of that square (-1 if error)
*/
public int getVal(int square)
{
/*
note: a return statement exits the method, so no
break statements are needed.
*/
switch(square)
{
case 1: return s1;
case 2: return s2;
case 3: return s3;
case 4: return s4;
case 5: return s5;
case 6: return s6;
case 7: return s7;
case 8: return s8;
case 9: return s9;
// if they give an invalid square number, return an error code of -1
default: return -1;
}
}
/*
Method: setVal(int square, int value)
Parameters: square; square number, value; value to set that square
Return: boolean; whether the square was set correctly
*/
public boolean setVal(int square, int value)
{
// if they give an invalid value, then return an error
if(value < 1 || value > 2)
return false;
/*
switch requires a variable of type char, byte, short, or int as
input.
*/
switch(square)
{
/*
check each case below to see if it is the variable
sent to us in square. if so, check to see if the square is
already set. if not, set it's value.
*/
case 1: if(s1 < 1) { s1 = value; return true; } break;
case 2: if(s2 < 1) { s2 = value; return true; } break;
case 3: if(s3 < 1) { s3 = value; return true; } break;
case 4: if(s4 < 1) { s4 = value; return true; } break;
case 5: if(s5 < 1) { s5 = value; return true; } break;
case 6: if(s6 < 1) { s6 = value; return true; } break;
case 7: if(s7 < 1) { s7 = value; return true; } break;
case 8: if(s8 < 1) { s8 = value; return true; } break;
case 9: if(s9 < 1) { s9 = value; return true; } break;
}
/*
if we haven't set a value, the user has either given an
invalid square number of the value of that square is already
set. return false (ie. no we didn't set the square's value)
*/
return false;
}
/*
Method: resetGame()
Parameters: none
Return: none
Purpose: reset the game to it's initial state
*/
public void resetGame()
{
s1 = s2 = s3 = s4 = s5 = s6 = s7 = s8 = s9 = 0;
}
/*
Method: winner()
Parameters: none
Return: int; value of winner
Purpose:
this function determines the winner of the tic tac toe game, if any
and returns 1 if it's X and 2 if it's O and 0 if no winner.*/
public int winner()
{
if((s1==2) && (s2==2) &&(s3==2))
{ int w = 2;
return w;}
else if((s1==1) && (s2==1) &&(s3==1))
{ int w = 1;
return w;}
if((s4==2) && (s5==2) &&(s6==2))
{ int w = 2;
return w;}
else if((s4==1) && (s5==1) &&(s6==1))
{ int w = 1;
return w;}
if((s7==2) && (s8==2) &&(s9==2))
{ int w = 2;
return w;}
else if((s7==1) && (s8==1) &&(s9==1))
{ int w = 1;
return w;}
// check columns
if((s1==2) && (s4==2) &&(s7==2))
{ int w = 2;
return w;}
else if((s1==1) && (s4==1) &&(s7==1))
{ int w = 1;
return w;}
if((s2==2) && (s5==2) &&(s8==2))
{ int w = 2;
return w;}
else if((s2==1) && (s5==1) &&(s8==1))
{ int w = 1;
return w;}
if((s3==2) && (s6==2) &&(s9==2))
{ int w = 2;
return w;}
else if((s3==1) && (s6==1) &&(s9==1))
{ int w = 1;
return w;}
// check diagonals
if((s1==2) && (s5==2) &&(s9==2))
{ int w = 2;
return w;}
else if((s1==1) && (s5==1) &&(s9==1))
{ int w = 1;
return w;}
if((s3==2) && (s5==2) &&(s7==2))
{ int w = 2;
return w;}
else if((s3==1) && (s5==1) &&(s7==1))
{ int w = 1;
return w;}
int w = -1;
return w;
}
public void showGame()
{
System.out.println("");
System.out.println(" " + toPiece(s1) + " | " + toPiece(s2) + " | " +
toPiece(s3));
System.out.println("---+---+---");
System.out.println(" " + toPiece(s4) + " | " + toPiece(s5) + " | " +
toPiece(s6));
System.out.println("---+---+---");
System.out.println(" " + toPiece(s7) + " | " + toPiece(s8) + " | " +
toPiece(s9));
System.out.println("");
}
/*
Method: toPiece
Parameters: piece; an integer representing an X or O
Return: String; the corresponding piece
*/
private String toPiece(int piece)
{
if(piece == 1)
{
return "X";
}
else
if(piece == 2)
{
return "O";
}
else
return " ";
}
}