array question

This is a discussion on array question within the C Programming forums, part of the General Programming Boards category; I have seen a two dimensional array[x][y] to be used in the code like this : array[i] When it is ...

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    array question

    I have seen a two dimensional array[x][y] to be used in the code like this : array[i]
    When it is used like this we mean that we only refer to the row and that the column is zero?
    Thank you.

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    Registered User Char*Pntr's Avatar
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    Quote Originally Posted by skiabox View Post
    I have seen a two dimensional array[x][y] to be used in the code like this : array[i]
    When it is used like this we mean that we only refer to the row and that the column is zero?
    Thank you.
    Read this, and then check back if you need more help.

    Cprogramming.com C guide Arrays for Dummies

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    I suppose that we can omit x or y if one of the two is zero.
    See this code that I get from a book I am reading :
    Code:
    for (i = 0; i < 9; i++)
        if (planets[i][0] == 'M')
           printf("%s begins with M\n", planets[i]);

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    C++ Witch laserlight's Avatar
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    Quote Originally Posted by skiabox
    I suppose that we can omit x or y if one of the two is zero.
    If that were true, then this should have the exact same output:
    Code:
    for (i = 0; i < 9; i++)
        if (planets[i][0] == 'M')
           printf("%s begins with M\n", planets[i][0]);
    Likewise, this should mean the exact same thing:
    Code:
    for (i = 0; i < 9; i++)
        if (planets[i] == 'M')
           printf("%s begins with M\n", planets[i][0]);
    But neither is the case. You can run the former for yourself and verify that the output may be different, and then your compiler should complain about the latter, especially if you turn on warnings.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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