any advice would be great

Question

cause&effect -1 Newbie Poster

15 Years Ago

I’m new in C#. My first attempt is a console application for the Noughts & Crosses game. I’m stuck in writing the condition for break if any player wins. Any comments will be appreciated.

//Tic Tac Toe

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TTT
{
    class Program
    {
        static void Main(string[] args)
        {
            int i = 0;
            int  n = 0;
            const int ARRAY1_LENGHT = 10;
            int[] array1 = new int[ARRAY1_LENGHT];
            array1[n] = 0;
            char[] array2 = { '1', '2', '3', '4', '5', '6', '7', '8', '9' };


            int[,] board = new int[3, 3];
            Console.SetCursorPosition(0, 0);



            Console.WriteLine();
            Console.WriteLine("   |   |   ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("  1|  2|  3");
            Console.WriteLine("------------ ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("  4|  5|  6");
            Console.WriteLine("------------ ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("  7|  8|  9");
            Console.WriteLine();
            Console.WriteLine();

            string input = "";

            while ( i <= 9  )
            {
                i++;
                Console.WriteLine(" Please enter a number from 1 to 9 : ");

                input = Console.ReadLine();
                n = int.Parse(input);

                if ( array1[n] == n )
                {
                    Console.WriteLine(" Please enter only number what hasn't been entered before : ");

                    input = Console.ReadLine();
                    n = int.Parse(input);    
                }

                array1[n] = n;

                if (n == 1)
                {
                    Console.SetCursorPosition(2,2);
                }
                if (n == 2)
                {
                    Console.SetCursorPosition(5,2);
                }
                if (n == 3)
                {
                    Console.SetCursorPosition(8, 2);
                }
                if (n == 4)
                {
                    Console.SetCursorPosition(2, 5);
                }
                if (n == 5)
                {
                    Console.SetCursorPosition(5, 5);
                }
                if (n == 6)
                {
                    Console.SetCursorPosition(8, 5);
                }
                if (n == 7)
                {
                    Console.SetCursorPosition(2, 8);
                }
                if (n == 8)
                {
                    Console.SetCursorPosition(5, 8);
                }
                if (n == 9)
                {
                    Console.SetCursorPosition(8, 8);
                }


                if (i % 2 == 0)
                {
                    Console.WriteLine("X");
                    array2[i] = 'X';
                }
                else
                {
                    Console.WriteLine("0");
                    array2[i] = '0';
                }

                
   if (array2[i] == array2[i + 1] && array2[i] == array2[i + 2] ||
       array2[i] == array2[i + 2] && array2[i] == array2[i + 4] ||
       array2[i] == array2[i + 3] && array2[i] == array2[i + 6] ||
       array2[i] == array2[i + 4] && array2[i] == array2[i + 8])
               
                    Console.SetCursorPosition(0, 15);
                    Console.WriteLine("WINNER IS ", array2[i]);
                    break;

               
            }
            Console.SetCursorPosition(0, 13); 
        }
    }
}

3 Contributors
9 Replies
87 Views
4 Days Discussion Span
Latest Post 15 Years Ago Latest Post by Antenka

All 9 Replies

Rashakil Fol 978 Super Senior Demiposter

15 Years Ago

You're missing braces, for one. And you only have 4 win conditions -- tic tac toe has eight. Why are you using the variable i in the win condition? The win condition has nothing to do with the turn number.

Rashakil Fol 978 Super Senior Demiposter

15 Years Ago

So there's your problem. If array2 gets stored 'X' when i is even and 'O' when i is odd, it will just contain { 'X', 'O', 'X', 'O', 'X', 'O', 'X', ... }

You should be using the turn number to figure out whether to write an X or an O, and you should be using the user's input to figure out what square to write the X or O to.

Antenka 274 Posting Whiz

15 Years Ago

Hello, cause&effect.
Just to add to Rashakil Fol's words: your array2 is specific view of your gaming board. That mean, that every value in it depends not only on who belongs the turn to, but also on a position, where to store 'X' or 'O'. You already use that to check the condition (e.g. (array2[0] == array2[2] && array2[0] == array2[1]) ... mean, that you're checking if the 'X'/'O' are placed in 1,2 and 3 fields).
But you don't use that to store data into array:

if (i % 2 == 0)
{  
     array2[i] = 'X';

Take that into account :)

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cause&effect -1 Newbie Poster · Answer 1 · 2009-03-12T16:52:34+00:00

Thank you for helping me out.
:)
Why I am using the variable i in the win condition?

If the win condition has nothing to do with the turn number.

Because
array2 stores X or O depending on who belongs the turn to :

if (i % 2 == 0)
                    {
                        Console.WriteLine("X");
                        array2[i] = 'X';
                    }
                    else
                    {
                        Console.WriteLine("0");
                        array2[i] = '0';
                    }

The line
Console.WriteLine("WINNER IS ", array2);
outputs who is winner – X or O.

The program compiles well as absolutely error-free. So if any braces were missing it would be pointed out immediately.

I implemented 8 winning conditions, but still these conditions don't work:

//Noughts & Crosses

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TTT
{
    class Program
    {
        static void Main(string[] args)
        {
            int i = 0;
            int n = 0;
            string input = "";
            bool exitGame = false;
            const int ARRAY1_LENGHT = 10;
            int[] array1 = new int[ARRAY1_LENGHT];
            array1[n] = 0;
            char[] array2 = { '1', '2', '3', '4', '5', '6', '7', '8', '9' };

            int[,] board = new int[3, 3];
            Console.SetCursorPosition(0, 0);

            Console.WriteLine();
            Console.WriteLine("   |   |   ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("  1|  2|  3");
            Console.WriteLine("------------ ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("  4|  5|  6");
            Console.WriteLine("------------ ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("   |   |   ");
            Console.WriteLine("  7|  8|  9");
            Console.WriteLine();
            Console.WriteLine();

            if (
                        array2[1] == array2[2] && array2[2] == array2[3] ||
                        array2[4] == array2[5] && array2[4] == array2[6] ||
                        array2[7] == array2[8] && array2[7] == array2[9] ||

                        array2[1] == array2[4] && array2[4] == array2[7] ||
                        array2[2] == array2[5] && array2[5] == array2[8] ||
                        array2[3] == array2[6] && array2[6] == array2[9] ||

                        array2[3] == array2[5] && array2[5] == array2[7] ||
                        array2[1] == array2[5] && array2[5] == array2[9]
                        )
            {
                exitGame = true;
            }

            while (!exitGame)
            {

                for (i = 0; i <= 9; i++)
                {
                    Console.SetCursorPosition(0, 13);
                    Console.WriteLine(" Please enter a number from 1 to 9 : ");

                    input = Console.ReadLine();
                    n = int.Parse(input);

                    if (array1[n] == n)
                    {
                        Console.WriteLine(" Please enter only number what hasn't been entered before : ");

                        input = Console.ReadLine();
                        n = int.Parse(input);
                    }

                    array1[n] = n;

                    if (n == 1)
                    {
                        Console.SetCursorPosition(2, 2);
                    }
                    if (n == 2)
                    {
                        Console.SetCursorPosition(5, 2);
                    }
                    if (n == 3)
                    {
                        Console.SetCursorPosition(8, 2);
                    }
                    if (n == 4)
                    {
                        Console.SetCursorPosition(2, 5);
                    }
                    if (n == 5)
                    {
                        Console.SetCursorPosition(5, 5);
                    }
                    if (n == 6)
                    {
                        Console.SetCursorPosition(8, 5);
                    }
                    if (n == 7)
                    {
                        Console.SetCursorPosition(2, 8);
                    }
                    if (n == 8)
                    {
                        Console.SetCursorPosition(5, 8);
                    }
                    if (n == 9)
                    {
                        Console.SetCursorPosition(8, 8);
                    }


                    if (i % 2 == 0)
                    {
                        Console.WriteLine("X");
                        array2[i] = 'X';
                    }
                    else
                    {
                        Console.WriteLine("0");
                        array2[i] = '0';
                    }


                    if (exitGame == true)
                    {
                        Console.SetCursorPosition(0, 15);
                        Console.WriteLine("WINNER IS ", array2[i]);
                        break;
                    }
                }
            }
        }
    }
}

cause&effect -1 Newbie Poster · Answer 2 · 2009-03-15T01:42:04+00:00

Right...code explanation how this works. The second array was initialized in the declaration line by placing list of 1-9 numbers:
char[] array2 = { '1', '2', '3', '4', '5', '6', '7', '8', '9' };
If the square is empty, the related to the square element of the second array equals to the number of the square: array2[n] = n+1.
If move has been made to the square, the element of the second array related to the square holds corresponding nought or cross:

if (i % 2 == 0)
                    {
                        Console.WriteLine("X");
                        array2[i] = 'X';
                    }
                    else
                    {
                        Console.WriteLine("0");
                        array2[i] = '0';
                    }

This helps to create 8 victory conditions because of stored noughts and crosses:

if (
    (array2[0] == array2[2] && array2[0] == array2[1]) ||
    (array2[0] == array2[4] && array2[0] == array2[8]) ||
    (array2[0] == array2[3] && array2[0] == array2[6]) ||
    (array2[3] == array2[4] && array2[3] == array2[5]) ||
    (array2[6] == array2[7] && array2[6] == array2[8]) ||
    (array2[2] == array2[4] && array2[2] == array2[6]) ||
    (array2[2] == array2[5] && array2[2] == array2[8]) ||
    (array2[1] == array2[4] && array2[1] == array2[7])
   )
    {
                        exitGame = true;
    }

Every element of the first array was initialized to 0 ->array1[n] =0 and with every move it gets the value of the square-> array1[n]=n.
With every move it helps checking - does square is empty or not:

if (array1[n] == n)
    {
    Console.WriteLine(" Please enter only number what hasn't been entered before : ");
     }
      else
          {
           validInput = true;
          }

I can't see any problem with arrays.

cause&effect -1 Newbie Poster · Answer 3 · 2009-03-16T00:05:25+00:00

There is nothing wrong in storing data into array as long as this helps with a victory check.

"What if
Michelangelo had said, ‘I don’t do ceilings,’ and walked away
from painting the Sistine Chapel?...”

Antenka 274 Posting Whiz · Answer 4 · 2009-03-16T00:19:49+00:00

Ok, let's see ... your array2 in any case has value { 'X', 'O', 'X', 'O', 'X', 'O', 'X', 'O', 'X' } (even if users during the game entering the 'X'/'O' in other order). To make it more obvious (same data in table view):
X | O | X
----------
O | X | O
----------
X | O | X

And you check THIS table for matching your conditions (not entered by user).

cause&effect -1 Newbie Poster · Answer 5 · 2009-03-16T01:41:05+00:00

Thank you, Antenka. My mistake was the index value - instead of i (number of moves) I must use n (position of square). Now my code gives correct output:

if (i % 2 == 0)
                    {
                        Console.WriteLine("X");
                        array2[n-1] = 'X';
                    }
                    else
                    {
                        Console.WriteLine("0");
                        array2[n-1] = '0';
                    }

Antenka 274 Posting Whiz · Answer 6 · 2009-03-16T01:44:19+00:00

Antenka 274 Posting Whiz

15 Years Ago

Good luck :)

any advice would be great

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