Arrays and the POINT structure

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    Arrays and the POINT structure

    Ok some of you might know that I have Sams Teach Yourself C++ in 21 days. So I you know read what they had on arrays, but then (which is not a whole lot) so now I am reading Programming Windows by Petzold......I stumbled upon this......


    POINT apt[5] = { 100, 100, 200, 100, 200, 200, 100, 200, 100, 100 } ;



    it says an array of five but then it has 10 elements, so I am guessing this is because it's part of a POINT structure which is a pair of values.........am I at least on the right track? Please reply ASAP I need this to go on.
    There are some real morons in this world please do not become one of them, do not become a victim of moronitis. PROGRAMMING IS THE FUTURE...THE FUTURE IS NOW!!!!!!!!!

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    im thinking your assumption is right?
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    WOHOOOOOOOOOO you wouldn't imagine how many times I refreshed this page............. thanks
    There are some real morons in this world please do not become one of them, do not become a victim of moronitis. PROGRAMMING IS THE FUTURE...THE FUTURE IS NOW!!!!!!!!!

    "...The only real game I thank in the world is baseball..." --Babe Ruth

    "Life is beautiful"-Don Corleone right before he died.

    "The expert on anything was once a beginner" -Baseball poster I own.


    Left cprog on 1-3-2005. Don't know when I am coming back. Thanks to those who helped me over the years.

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    Unhappy

    I'm a new commer, I hope everbody will help me more. Now, i'm learning C++ programing, and i'm afraid with pointer very much, i have read Sams Teach Yourself C++ in 21 days but sometimes i don't understand too much about pointer, someone can help me?

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    Best guess: You're looking at a "window/rectangle". (Check the values against the coordinates of a rectangle.)

    In short, they're x,y coordinates.

    May explain why the initialization of the "array" is mirror-image of itself.

    (Note how the last pair of values match the first.)

    I'm not a "windows" programmer, but try to find out how POINT is defined. May give you a clue.

    (I'm not breaking any new ground here, am I? )

    -Skipper

    P.S. Where, in the world, did all of the superfluous postings come in?
    "When the only tool you own is a hammer, every problem begins to resemble a nail." Abraham Maslow

  6. #6
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    POINT and pointer are quite different. POINT is a structure defined in one of the windows header files. It contains two variables that represent an x location and a y location.

    A pointer is simply a memory address. For example, look at the following code:
    Code:
    int *pnum;//declares a pointer
    int number;//declares an int
    number=4;//sets number equal to 4
    pnum=&number;//makes pnum 'point' to number
    cout<<number //outputs 4
           <<endl<<*pnum //outputs a new line then 4 because 4 is the value stored at the address of number
           <<endl<<pnum; //outputs a new line then the memory address
    
    number=6;
    cout<<number<<endl<<*pnum;  //outputs 6 twice because pnum points to number;
    Basically, to get the value at the address, you use the * (dereference operator). To get the actual memory address, you leave out the *.

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    Code:
    typedef struct tagPOINT
    {
        LONG  x;
        LONG  y;
    } POINT, *PPOINT, NEAR *NPPOINT, FAR *LPPOINT;
    always looking, make an offer. get me out of this place.

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    Golfinguy4,

    As I said, not a "windows" programmer. (Could you tell?) Thanks for the clarification. Good info.

    Hershlag,

    Guess that's what I was, sort of, expecting to see pop up. Thanks.

    -Skipper

    (P.S. This is Elchulo's post and I'm thanking everyone . Well, darn it, I appreciate the input!)
    "When the only tool you own is a hammer, every problem begins to resemble a nail." Abraham Maslow

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    Wink

    wow!!! that room is interesting!!!!
    thanks a lot tutors, i've just learnt about C++ , i think that room is good for me, thanks a lots

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    sorry i have a exercise like that, as i know with this exercise i must use about 4 times 'for condition'. but when i write i can't find the way to solve it, some one can help me:

    Write a program that reads a character string & prints out each word in a separate line. A word consist of consecutive characters delimeted by spaces or the beginning or the end of the string.
    thanks , i don't need you write for me a code but i want to know , if i don't use that way how i can do another way???
    please explain for me the way you solve

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    Thanks guys for the help.
    There are some real morons in this world please do not become one of them, do not become a victim of moronitis. PROGRAMMING IS THE FUTURE...THE FUTURE IS NOW!!!!!!!!!

    "...The only real game I thank in the world is baseball..." --Babe Ruth

    "Life is beautiful"-Don Corleone right before he died.

    "The expert on anything was once a beginner" -Baseball poster I own.


    Left cprog on 1-3-2005. Don't know when I am coming back. Thanks to those who helped me over the years.

  12. #12
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    Look up the function strtok.

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