two dimensional int array access problems ;/

This is a discussion on two dimensional int array access problems ;/ within the C Programming forums, part of the General Programming Boards category; Hi again I have a constant int array which looks like that: Code: const int *summaries[] = {{3, 4, 5, ...

  1. #1
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    two dimensional int array access problems ;/

    Hi again

    I have a constant int array which looks like that:
    Code:
    const int *summaries[] = {{3, 4, 5, 6, 0}, {5, 0}};
    i guess there is something wrong with it becasue when compiling i get such warnings:
    Code:
    quota_prepare.c:28: warning: braces around scalar initializer
    quota_prepare.c:28: warning: (near initialization for `summaries[0]')
    quota_prepare.c:28: warning: initialization makes pointer from integer without a cast
    quota_prepare.c:28: warning: excess elements in scalar initializer
    quota_prepare.c:28: warning: (near initialization for `summaries[0]')
    quota_prepare.c:28: warning: excess elements in scalar initializer
    quota_prepare.c:28: warning: (near initialization for `summaries[0]')
    quota_prepare.c:28: warning: excess elements in scalar initializer
    quota_prepare.c:28: warning: (near initialization for `summaries[0]')
    quota_prepare.c:28: warning: excess elements in scalar initializer
    quota_prepare.c:28: warning: (near initialization for `summaries[0]')
    quota_prepare.c:28: warning: braces around scalar initializer
    quota_prepare.c:28: warning: (near initialization for `summaries[1]')
    quota_prepare.c:28: warning: initialization makes pointer from integer without a cast
    quota_prepare.c:28: warning: excess elements in scalar initializer
    quota_prepare.c:28: warning: (near initialization for `summaries[1]')
    And when i try to access one of the fields i get segmentation fault.

    Could You please tell me how to correct this?

    Best regards

  2. #2
    ATH0 quzah's Avatar
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    You don't have a two dimensional array there. You have an array of pointers to integers.


    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    Registered User ssharish2005's Avatar
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    it should be some thing like this

    Code:
    int arr[][10]={{3, 4, 5, 6, 0}, {5, 0}};
    and here is a sample code on how to work on 2D array
    Code:
    #include<stdio.h>
    
    int main()
    {
        int arr[][10]={{3, 4, 5, 6, 0}, {5, 0}};
        int i,j;
    
        for(i=0;i<2;i++)
        {
            for(j=0;j<5;j++)
                printf("%d\t",arr[i][j]);
            
            printf("\n");
        }
        getchar();   
    }
    /*myoutput
    3       4       5       6       0
    5       0       0       0       0
    */
    ssharish2005

  4. #4
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    Hi

    Thank You very much for this one ;] of course it works just fine.
    But i have one more questions about multid. arrays. Is there any way of knowing what is the size of the first dimension? I need it for my while loop. I always put 0 on the end of the field to know where it ends but i don't know how many fields there are and after second pass i get segmentation fault. I can put there {0} and do
    Code:
    if (arr[i][0] == 0) break;
    but i thought that maybe there is a better way.


    Best regards

  5. #5
    cwr
    cwr is offline
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    Well, you can do:
    Code:
    sizeof arr / sizeof arr[0]
    To work out the number of rows, if that's what you mean.

  6. #6
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    What i want is to get to know number x from array[x][y]

  7. #7
    Registered User ssharish2005's Avatar
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    Quote Originally Posted by krST
    What i want is to get to know number x from array[x][y]
    look CWR post, to get the value of 'x' thats is no of rows.

    ssharish2005

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