question from a newbie

This is a discussion on question from a newbie within the C Programming forums, part of the General Programming Boards category; Hi. Sorry to bother you guys with this newbie problem I'm having. I'm trying to learn C by trying to ...

  1. #1
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    question from a newbie

    Hi. Sorry to bother you guys with this newbie problem I'm having. I'm trying to learn C by trying to create a tic-tac-toe game. This is my code so far:

    Code:
    #include <stdio.h>
    
    #define ROWS 3
    #define COLUMNS 3
    
    void initialize_board(void);
    void test(void);
    
    int board[ROWS][COLUMNS];
    
    int main() {
        initialize_board();
    
        test();
    
        return 0;
    }
    
    void initialize_board(void) {
        int i, j;
        extern int board[][];
    
        for (i = 0; i < ROWS; ++i)
            for (j = 0; j < COLUMNS; ++j)
                board[i][j] = 0; // compiler error here!
    }
    
    void test(void) {
        int i, j;
        extern int board[][];
    
        for (i = 0; i < ROWS; ++i)
            for (j = 0; j < COLUMNS; ++j)
                printf("board[%d][%d] = %d", i, j, board[i][j]); // compiler error here!
    }
    The problem is that the compiler complains about "invalid use of array with unspecified bounds". I do not know how to fix the compiler errors. Can anyone show me what I'm doing wrong?

  2. #2
    Math wizard
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    Perhaps, instead of "++i", try "i++" - the switcharoo with the plus signs and the i. The same for the j variable.
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  3. #3
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    Quote Originally Posted by ulillillia View Post
    Perhaps, instead of "++i", try "i++" - the switcharoo with the plus signs and the i. The same for the j variable.
    I feel so stupid...the simple remedy was to remove the "extern" declarations. Thanks for the feedback though.

  4. #4
    Woof, woof! zacs7's Avatar
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    Quote Originally Posted by yoda05378 View Post
    I feel so stupid...the simple remedy was to remove the "extern" declarations. Thanks for the feedback though.
    Yes, Was about to say that, they're infact compiled in the same module hence no 'extern' keyword needed.

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