Thread: Array

  1. #1
    Registered User
    Join Date
    Dec 2006

    Arrow Array

    Hi all, I'm a beginner in C and was trying my hands at some coding with arrays. I had the array initialized with a size of ten, but later found that I could assign values to array elements that is beyond the 9th element. Why isn't there any exceptions thrown? Is this normal in C? If this is the case then why should we specify the array size in the first place?

    Here's a snippet of my code:

    #define MAX 10
    int a[MAX];
    int i;
    for ( i=0; i<MAX; i++) {
          a[i] = /*some random number*/;
          printf("%d\n", a[i]);
    a[20] = 2020;
    printf("%d", a[20]);  // prints 2020, no exceptions!
    Thanks in advance!

  2. #2
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    C does not check bounds - it's your job...
    when you access memory out of bounds - the result is undefined, can be a GPF, can be some over variable overwritten, or you can not note it till it runs in some other environment
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

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