confuse with character array

This is a discussion on confuse with character array within the C Programming forums, part of the General Programming Boards category; Can anyone can explain what difference between an array of character and a C string? How does it behave in ...

  1. #1
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    Question confuse with character array

    Can anyone can explain what difference between an array of character and a C string? How does it behave in each type?

    /* Define an array of character, but not string*/
    char Char_Array[2] = {'T', 'F'};

    /* Define a C string */
    char String[3] = {'H', 'I', '\0'};
    /* And below array will be treat as array of character or a C string */
    char A[] = {'H','E','L','L','O'};

    From above, which one is array of char, and
    which one is C string?

    Also, can I do like this:

    for (i = 0; i<2; i++)
    Char_Array[i]= 'T'; //all set to 'T'(true)

    Thanks!
    DV007

  2. #2
    pronounced 'fib' FillYourBrain's Avatar
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    they are ALL arrays of char

    C strings are null terminated as a standard but let's face it, you can store strings lots of ways in C. Just a little extra power that C gives you. Pascal style arrays start with the first char being the size. You can store strings that way in C. in short, the standard that has been adopted is a char array that is null terminated.
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

  3. #3
    Code Goddess Prelude's Avatar
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    A C string is different from an array of char only by the terminating nul character. Without the nul ('\0'), a string is just an array of char.

    -Prelude
    My best code is written with the delete key.

  4. #4
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    Basically they are the same, in fact a c string is an array of chars. Strings do take some getting used to, espeically in C, as there are so many permutations.
    Take the following, although it may work on a compiler, it is wrong.
    char A[] = {'H','E','L','L','O'};
    The thing with character arrays is to allways remember the null character.
    char A[] = {'H','E','L','L','O','\0'};

  5. #5
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    Originally posted by Prelude
    A C string is different from an array of char only by the terminating nul character. Without the nul ('\0'), a string is just an array of char.

    -Prelude

    So,
    char Arr[] = {'H','E','L','L','O'}; is not a C string???
    but char Arr[] = {'H','E','L','L','O','\0'} is?

  6. #6
    Registered User The Dog's Avatar
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    So,
    char Arr[] = {'H','E','L','L','O'}; is not a C string???
    but char Arr[] = {'H','E','L','L','O','\0'} is?
    Exactly!

  7. #7
    and the hat of wrongness Salem's Avatar
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    > char Arr[] = {'H','E','L','L','O','\0'}
    Yeah, but that's too much like work, so there is a short form which is this...

    char Arr[] = "HELLO";

    This includes the '\0', so you don't have to keep remembering to add it yourself

    But beware of doing something like this
    char Arr[5] = "HELLO";
    This does NOT have a \0 at the end

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