so how do I fix this or what did i do rong

This is a discussion on so how do I fix this or what did i do rong within the C++ Programming forums, part of the General Programming Boards category; hay guys shat is happining here I dont understand here is the code Code: int main(int x = 100, int ...

  1. #1
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    so how do I fix this or what did i do rong

    hay guys shat is happining here I dont understand
    here is the code
    Code:
    int main(int x = 100, int y = 100)
    {
    cout << x << ", " << y << endl;
    cin.ignore();
    }
    i should get 100, 100 but i get this 1, 2242648

    so how do I fix this or what did i do rong
    Iím Dyslexic and I know that I donít spell well so quit telling to learn my English because I do my best at it all right.

    Windows XP with Dev-C++ for now.

  2. #2
    C++まいる!Cをこわせ!
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    I would say that's kinda undefined at best. Main isn't supported to take x and y. Why not make another function not named main and try again?

  3. #3
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    main has some prototypes that are legal, and others aren't. see the faq for more information.

  4. #4
    Kernel hacker
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    And aside from the fact that you can't just use any arguments to main(), default arguments are based on the compiler resolving the call to the function [as discussed elsewhere]. In this case, that's the C runtime library, and you need to declare the main() with defaults there, then call main without arguemnts. Since NONE of the above is happening, x and y are just reflecting the values of argc and argv respectively.

    So it's not EVER going to work, unless you modify the code calling main - which you most likely don't actually want to do.

    --
    Mats
    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.

  5. #5
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    sorry not the right code here
    Code:
    #include <iostream>
    #include <stdlib.h>
    #include <windows.h>
    
    int click(int x, int y)
    {
      mouse_event(MOUSEEVENTF_LEFTDOWN, x, y, 0, 0);
      Sleep(rand(20)&#37;15);
      mouse_event(MOUSEEVENTF_LEFTUP, x, y, 0, 0);
    cout << x << "," << y << endl; // x = 100 and y = 100 like it is suposted to
    return 0;
    }
    
    int main()
    {
    int x, y;
    click(110, 100);
    cout << x << "," << y << endl; // x = 37879712 and y = 575 ????????????????????
    cin.ignore();
    }
    Why is x and y returning that value when nothing else was changed?
    Iím Dyslexic and I know that I donít spell well so quit telling to learn my English because I do my best at it all right.

    Windows XP with Dev-C++ for now.

  6. #6
    C++まいる!Cをこわせ!
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    x and y are never initialized, so you're getting junk data.
    Do you use compiler warnings?

  7. #7
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    yes but dosent show up for this than. could you show me an example of how this should be? thanks
    Iím Dyslexic and I know that I donít spell well so quit telling to learn my English because I do my best at it all right.

    Windows XP with Dev-C++ for now.

  8. #8
    C++まいる!Cをこわせ!
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    How to enable warnings or junk data problem? You're being unclear.

  9. #9
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    sorry the junk data
    Iím Dyslexic and I know that I donít spell well so quit telling to learn my English because I do my best at it all right.

    Windows XP with Dev-C++ for now.

  10. #10
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    Code:
    int x = 100, y = 100;

  11. #11
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    sorry maybe I’m saying this wrong but what I’m trying to get to happen if for x and y to be initialized from the first function into the main function. So I’m wonting the main function to return 100 100 because function “click” declared x and y before.
    Iím Dyslexic and I know that I donít spell well so quit telling to learn my English because I do my best at it all right.

    Windows XP with Dev-C++ for now.

  12. #12
    C++まいる!Cをこわせ!
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    Erm, you want the click function to store information in x and y? If so, then read the references tutorial at the site.

  13. #13
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    Those are different x and y.

    If you want x and y in main to "become" x and y in your function, you need to pass by reference, which in C++ means to use
    Code:
    int click(int &x, int &y)
    This means that "an alias" of x and y is passed, rather than a copy. Of course, if you take a copy of a page in a book, and scribble all over it, it will still be no scribbles in the book itself. Similarly, you need the original x and y to be in your function, not copies.

    --
    Mats
    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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