Thread: newbie: array question :(

  1. #1
    Registered User
    Join Date
    Apr 2008

    Cool newbie: array question :(

    sup guys its me the newbie c student again! hope u guys didnt get tired by my whole lots of newbie questions well.. i have another doubt to be cleared.. here's it:

    lets say we have 2 strings:
    char a[] = {'h','e','l','l','o','\0'};
    char b[10] = "hello"
    is b[5] == a[5]?

    from what i know, b[5] is = \0, therefore, i deduced that b[5] == a[5] is true. what if i compare b[6] == a[5] ?? am i correct?

    Thanks for all the answers, im learning alot of stuff here

  2. #2
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    is b[5] == a[5]?
    Yes, but you could have checked that yourself with a test program.

    what if i compare b[6] == a[5] ??
    b[6] should also be '\0'.
    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

  3. #3
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    b[6] should also contain zero, so yes, b[6] and a[5] are identical in this case.

    Of course, if you do:
    char a[] = {'h','e','l','l','o','\0'};
    char b[10];
    strcpy(b, a);
    then b[6] is undefined - it may happen to be zero, but it's just as likely to be some other value between -128 and 127 (or 0..255 if char happens to be unsigned in your compiler).

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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