how can i pass 2d arrays

This is a discussion on how can i pass 2d arrays within the C++ Programming forums, part of the General Programming Boards category; i am trying to define function to accept 2d arrays like this bool abc(int def[][]); but vc is not letting ...

  1. #1
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    how can i pass 2d arrays

    i am trying to define function to accept 2d arrays like this

    bool abc(int def[][]);

    but vc is not letting me, with this error

    error C2087: '<Unknown>' : missing subscript

    does this means we can't pass 2d arrays?

  2. #2
    Registered User jasrajva's Avatar
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    try passig it as def[subscript1][subscript2]
    if you know them in advance
    otherwise use
    int** def

  3. #3
    Banned Troll_King's Avatar
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    You have to specify the first index:

    bool abc(int def[10][]);
    Last edited by Troll_King; 11-01-2001 at 07:30 PM.

  4. #4
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    jasrajva(anybody), can you please given me an example of

    int** def

    specifying the first index would really limit the functionality.

  5. #5
    and the hat of wrongness Salem's Avatar
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    Marvellous - 3 wrong answers in a row - at least Troll_King is on the right track.

    If you have
    int array[ROW][COL];

    Then the valid function prototypes are
    void foo ( int a[ROW][COL] );
    void foo ( int a[][COL] );
    void foo ( int (*a)[COL] );

    And you call this function like so
    foo ( array );

    You must specify all the substripts - EXCEPT the first one, which is entirely optional.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  6. #6
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    Try this m8, this is a small example of how it is done

    #include <iostream.h>


    void read(int a[][5]);
    void print(const int a[][5]);


    int main()
    {
    int a[3][5];
    read (a);
    print(a);



    return 0;
    }

    void read(int a[][5])
    {

    cout << "Enter 15 integres, 5 per row:\n";
    for(int i = 0; i < 3; i++)
    {
    cout << "Row " << i << ": ";
    for(int j = 0; j < 5; j++)
    cin >> a[i][j];
    }
    }

    void print(const int a[][5])
    {

    for(int i = 0; i < 3; i++)
    {
    for(int j = 0; j < 5; j++)
    cout << " " << a[i][j];
    cout << endl;

    }

    }

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