char array

This is a discussion on char array within the C++ Programming forums, part of the General Programming Boards category; How do I initalize a char array with ' ' (space) in a class ? Code: class foo { public: ...

  1. #1
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    char array

    How do I initalize a char array with ' ' (space) in a class ?

    Code:
    class foo
    {
      public:
      foo();
      private:
      char matrix[64];
    };
    
    foo::foo()
    {
      matrix[64] = {' '};
    }
    This doesnt compile. 'Parse error before '{' token'

    Why doesnt this work ? Thanks for any help\advice.

  2. #2
    Registered User The Dog's Avatar
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    2 lines of code
    Code:
    //In your constructor
    for( int i = 0; i < 64; i++ )
        matrix[i] = ' ';

  3. #3
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    Yeah I know thats a way to go but could you please explain to me why my code doesnt work ? Cheers

  4. #4
    Registered User The Dog's Avatar
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    I think your code will only work on initialization of the array.
    Code:
    char buf[64] = {' '};  //Declare and initialize

  5. #5
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    even then, only the first value of the array would be filled with a space. the rest would be filled with zeros (or, when translated into a character, the null terminator: '\0' ). you cant initialize variables in a class declaration ( with the exception of enums )

    if you know the ascii value of space, you could try using the memset function.

    most people just op for the for loop.
    I came up with a cool phrase to put down here, but i forgot it...

  6. #6
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    I notice DirectX programming uses the memset function a lot to clear out structs. Is there any dangers in using this function? What is the exact syntax. I will look this up anyhow but thought I'd ask.

  7. #7
    mustang benny bennyandthejets's Avatar
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    if you know the ascii value of space, you could try using the memset function.
    Even if you don't know this ASCII value (but you should), it doesn't matter.
    Code:
    memset(buf,' ',64);
    Single quotes resolve to the ASCII value. Plus, it allows you to more easily see which character you're actually talking about, as opposed to having to look it up in a table.
    benforbes@optusnet.com.au
    Microsoft Visual Studio .NET 2003 Enterprise Architect
    Windows XP Pro

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