A question about string

This is a discussion on A question about string within the C Programming forums, part of the General Programming Boards category; If I have a string like this: char myString [5]; But I didn't put any characters into the array does ...

  1. #1
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    A question about string

    If I have a string like this:

    char myString [5];

    But I didn't put any characters into the array
    does it mean:

    myString [0] = '\0'
    myString [1] = '\0'
    myString [2] = '\0'
    myString [3] = '\0'
    myString [4] = '\0'

    ????

  2. #2
    Registered User claudiu's Avatar
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    No. It means you can't know for sure what it does contain until you initialize it to something.

  3. #3
    "I Win!" by U. Lose vart's Avatar
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    Quote Originally Posted by winggx View Post
    If I have a string like this:

    char myString [5];

    But I didn't put any characters into the array
    does it mean:

    myString [0] = '\0'
    myString [1] = '\0'
    myString [2] = '\0'
    myString [3] = '\0'
    myString [4] = '\0'

    ????
    no...
    your array contains garbage and so cannot be used as string till you initialize it...

    the simplest way to initialize string will be
    Code:
    char myString [5] = "";
    the alternative is


    Code:
    char myString [5] =  {0};
    To be or not to be == true

  4. #4
    Registered User UltraKing227's Avatar
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    yep, vart said it right. but just a note:

    Code:
    myString [0] = '\0'
    myString [1] = '\0'
    myString [2] = '\0'
    myString [3] = '\0'
    myString [4] = '\0'
    inside of doing that, you could simple use the first line of code. since
    C stops processing a string after reaching the \0 sign.

  5. #5
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    How about following code?
    Code:
     
    static char myString [5];
    Regards,
    Siddu

  6. #6
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by Siddu_Kyocera
    How about following code?
    myString would have static storage duration, thus it would be zero initialised.
    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

  7. #7
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    As long as the string is defined globally, it's same as static and is initialized to zeroes. If it's defined inside a function then its memory is the stack. It is not zeroed out when the function is executed.
    Last edited by nonoob; 03-23-2010 at 04:19 PM.

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