arrays and random numbers

This is a discussion on arrays and random numbers within the C Programming forums, part of the General Programming Boards category; hi, i am currently trying to get my program to use an array to store 100 random numbers (0-20) or ...

  1. #1
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    Oct 2002
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    5

    arrays and random numbers

    hi, i am currently trying to get my program to use an array to store 100 random numbers (0-20) or rand % 20, then print those numbers in 5x20 row column format. However i have tried everything possible and not been able to get my program to work. I was hoping someone could give me some help on this one. thankx

  2. #2
    Lead Moderator kermi3's Avatar
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    Show us what you have so far and where you think you're going wrong.
    Kermi3

    If you're new to the boards, welcome and reading this will help you get started.
    Information on code tags may be found here

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  3. #3
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    heres what i have so far

    ok here it is
    #include<time.h>
    #include<stdlib.h>
    #define ROWS = 5
    #define COLUMNS = 20

    int main (void)

    srand(time(NULL));
    int array[ROWS][COLUMNS];
    int i, j, x
    for (i=0; i<100; i++);
    array[i]
    if (i > 0 && i < 19)
    printf("%2d", array[i]);

    if (i > 19 && i < 39)
    printf("%2d", array[i]);
    esle if (i > 39 && i < 59)
    printf("%2d", array[i]);
    else if (i > 59 && i < 79)
    printf("%2d", array[i]);
    else if (i > 79 && i < 99)
    printf("%2d", array[i]);


    that what i have, but i know its wrong

  4. #4
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    Posts
    14,826
    I'll add corrections as I go...

    1) Use code tags.
    Code:
    #include<time.h>
    #include<stdlib.h>
    #define ROWS = 5
    #define COLUMNS = 20
    
    /*
        Error #1 - You have no { } around
        the main function.
    */
    int main (void)
    {
    /*
        srand(time(NULL));
    
        Error #2 - Declare variables before
        calling any functions. This is C, not
        C++.
    */
    int array[ROWS][COLUMNS];
    int i, j, x
    
        /*moved to here */
        srand(time(NULL));
    
    /*
        for (i=0; i<100; i++);
    
        Error #3 - Not technicly an error, but
        not what you want. Your ; at the
        end of the for() function makes your
        function not do anything useful.
    
        Error #4 - You should really use { }
        whenever you want to create blocks
        of code. Since I don't know where 
        you plan on blocking things off, I'll
        assume.
    
        Error #5 - You shouldn't treat
        multidimensional arrays as single 
        dimension arrays. I believe technicly
        they're the same thing, but it's
        generally bad form. As such, this
        should be a nested loop.
    
        Additionally, you should use your
        define here as a loop counter
        instead of a static number.
    
        If you want to tread them as a
        single dimensional array here, do
        like so:
    */
        for( i = 0; i < (ROWS*COLUMNS); i++ )
        {
            /*
                 This line does nothing. What are you trying to do here?
            */
            array[i]
    I'll assume you're trying to assign some random value, but I'll stop here and let you see what you can some up with.

    Remember: for every { you need one and only one }

    Quzah.
    Last edited by quzah; 10-23-2002 at 09:38 PM.
    Hope is the first step on the road to disappointment.

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