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Connect 4 game

This is a discussion on Connect 4 game within the C++ Programming forums, part of the General Programming Boards category; Hi all, i'm new at c++ so please be patient with me .I'm writing connect 4 game and stuck at ...

  1. #1
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    Connect 4 game

    Hi all, i'm new at c++ so please be patient with me .I'm writing connect 4 game and stuck at checkwin function.

    Here's my code:

    Code:
    #include <iostream>
    #include <cstdlib>
    
    
    using namespace std;
    
    
    char place[6][7];
    int iPlayerTurn=1, turn, win;
    int pos0=5, pos1=5, pos2=5, pos3=5, pos4=5, pos5=5, pos6=5;
    int tie=0; // if the board is full, game ends as draw.
    char cPlayerMark; // player mark, X and O.
    
    
    void drawBoard() // function to draw a board
    {
        cout << " 1   2   3   4   5   6   7" << endl;
        for(int a=0; a<=5; a++)
        {
            for(int b=0; b<=6; b++)
    
    
                cout << char(218) << char(196) << char(191) << " ";
                cout<<'\n';
    
    
            for(int b=0; b<=6; b++)
    
    
                cout<<char(179)<<place[a][b]<<char(179)<<" ";
                cout<<'\n';
    
    
            for(int b=0; b<=6; b++)
    
    
                cout<<char(192)<<char(196)<<char(217)<<" ";
                cout<<'\n';
    
    
        }
    }
    
    
    int checkwin() // totaly stuck here
    {
    
    
    }
    
    
    int main()
    {
       drawBoard();
    
    
       do
       {
           cout << "Player " << iPlayerTurn << " turn: " << endl;
           cin >> turn;
    
    
           if(iPlayerTurn == 1) // sets player mark between X and O
           {
               cPlayerMark = 'X';
           }
           else
           {
               cPlayerMark = 'O';
           }
    
    
           if(iPlayerTurn == 1) // after 1 move changes the player
           {
               iPlayerTurn = 2;
           }
           else
           {
               iPlayerTurn = 1;
           }
    
    
           if(turn == 1)
           {
                place[pos0][0] = cPlayerMark;
                pos0--; // every time you place mark, it goes up by 1 column
                tie++; // not sure if this necessary , but if tie == 42, game is draw, because then its full board.
           }
           else if(turn == 2)
           {
               place[pos1][1] = cPlayerMark;
               pos1--;
               tie++;
           }
           else if(turn == 3)
           {
               place[pos2][2] = cPlayerMark;
               pos2--;
               tie++;
           }
           else if(turn == 4)
           {
               place[pos3][3] = cPlayerMark;
               pos3--;
               tie++;
           }
           else if(turn == 5)
           {
               place[pos4][4] = cPlayerMark;
               pos4--;
               tie++;
           }
           else if(turn == 6)
           {
               place[pos5][5] = cPlayerMark;
               pos5--;
               tie++;
           }
           else if(turn == 7)
           {
               place[pos6][6] = cPlayerMark;
               pos6--;
               tie++;
           }
           else
           {
               cout << "Wrong number." << endl; // if wrong move, player turn and mark stays the same
               if(cPlayerMark == 'X')
               {
                   iPlayerTurn = 1;
               }
               if(cPlayerMark == 'O')
               {
                   iPlayerTurn = 2;
               }
           }
    
    
    
    
           drawBoard();
       }while(tie!=42);
    
    
    }

  2. #2
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    You can try adding a condition to your do-while cycle, such as: do <code>, while(tie!=42 || checkwin != true), where checkwin is a boolean function and returns true if there is a winner and false if not.

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    I think i know what you are saying, but i don't know how to write that boolean function. Also, my cPlayerMark and place[][] are chars, so doesn't it make it harder to do?

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    Quote Originally Posted by Aeoskype View Post
    I think i know what you are saying, but i don't know how to write that boolean function. Also, my cPlayerMark and place[][] are chars, so doesn't it make it harder to do?
    you have to pass the place into the function
    Code:
    bool checkwin(char place[6][7],int iPlayer)
    and then make 3 separate cycles to check for horizontal, vertical and diagonal returning true in the cycle or false in the end if none of the cycles found any. (you'll also need to pass the player that just played or at least the 'X'/'O' char so the functions knows what to check for).
    Last edited by killme; 04-22-2013 at 09:20 AM.

  5. #5
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    But how i check for horizontal, vertical and diagonal win?

  6. #6
    C++まいる!Cをこわせ! Elysia's Avatar
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    How would you do it on paper?
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  7. #7
    Registered User rogster001's Avatar
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    But how i check for horizontal, vertical and diagonal win?
    You will need quite a bit of work/study to get there. As Elysia says, it is probably best to start with pen and paper - That way you can start seeing the relationships between 'nodes' in your board building up and think of ways you might determine a checking method - one thing that will become apparent is that each token is (potentially) surrounded by 8 other positions - so one approach can be to check sequentially if any of the tokens in an adjacent slot matches the token at the current node - If so, you can know the direction of a potential winline and continue checking in that direction - ie move to that node and check in the same direction if there is a matching token - if it fails you return to your original token and check the next adjacent one in the opposite direction for a match and repeat the above etc. - because the current token may be at the centre of a winline for example - If it fails that way then you have to return to your original token and check the next adjacent one in a the next direction and repeat the above. If your matched count reaches 4 then you have a win. If not move to next node and check the same way.
    Don't forget to accomodate the edges of the board.
    Last edited by rogster001; 04-22-2013 at 01:19 PM.
    Thought for the day:
    "Are you sure your sanity chip is fully screwed in sir?" (Kryten)
    FLTK: "The most fun you can have with your clothes on."

    Stroustrup:
    "If I had thought of it and had some marketing sense every computer and just about any gadget would have had a little 'C++ Inside' sticker on it'"

  8. #8
    Algorithm Dissector iMalc's Avatar
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    Quote Originally Posted by Aeoskype View Post
    But how i check for horizontal, vertical and diagonal win?
    Using loops.
    My homepage
    Advice: Take only as directed - If symptoms persist, please see your debugger

    Linus Torvalds: "But it clearly is the only right way. The fact that everybody else does it some other way only means that they are wrong"

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    Ok, but i don't know how to make loops for this. Can someone give one example for horizontal or vertical check? I would appreciate it.

  10. #10
    Registered User rogster001's Avatar
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    you do know how to make loops - you already used nested loops in your other code
    Thought for the day:
    "Are you sure your sanity chip is fully screwed in sir?" (Kryten)
    FLTK: "The most fun you can have with your clothes on."

    Stroustrup:
    "If I had thought of it and had some marketing sense every computer and just about any gadget would have had a little 'C++ Inside' sticker on it'"

  11. #11
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    I know how to make loops, but i don't know how to make loop to check for win. This is what i am asking - to write a loop for horizontal or vertical win check.

  12. #12
    Registered User rogster001's Avatar
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    Well what sort of things do you think you need to do to check? I gave you a description of a method you could try and implement. I think it might work well with recursion actually but equally fine as loops of course
    Thought for the day:
    "Are you sure your sanity chip is fully screwed in sir?" (Kryten)
    FLTK: "The most fun you can have with your clothes on."

    Stroustrup:
    "If I had thought of it and had some marketing sense every computer and just about any gadget would have had a little 'C++ Inside' sticker on it'"

  13. #13
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    Could you just write that checkwin function for me? Only for horizontal or vertical win.

  14. #14
    Registered User rogster001's Avatar
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    You really have to make an attempt - spoon feeding is not going to help you - the CheckWin function should be a fun challenge for you if are interested in programming. You will be so pleased when you crack the problem and have a working function, and you will have learnt a lot getting there! Plus this 'check a connect four win' must have been asked a gazillion times all over the place - you can easily research some sample code - just for ideas to get you going.
    Thought for the day:
    "Are you sure your sanity chip is fully screwed in sir?" (Kryten)
    FLTK: "The most fun you can have with your clothes on."

    Stroustrup:
    "If I had thought of it and had some marketing sense every computer and just about any gadget would have had a little 'C++ Inside' sticker on it'"

  15. #15
    C++まいる!Cをこわせ! Elysia's Avatar
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    Quote Originally Posted by Aeoskype View Post
    Could you just write that checkwin function for me? Only for horizontal or vertical win.
    Use a flowchart or pseudo code. Give an attempt with that, at least.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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