Memory Addresses

This is a discussion on Memory Addresses within the C++ Programming forums, part of the General Programming Boards category; Hello all How do I assign a variable to a specific memory address?...

  1. #1
    Registered User
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    Question Memory Addresses

    Hello all
    How do I assign a variable to a specific memory address?

  2. #2
    Guest Sebastiani's Avatar
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    Code:
     int address = 1000;
     int * ptr = (int*)address;
     *ptr = 175; //... cross fingers :D ...
    Code:
    bool fun(bool value)
    {
        return std::pow(std::exp(1), std::complex<float>(0, 1) 
        * std::complex<float>(std::atan(1)*(1 << (value + 2))))
        .real() > 0;
    }

  3. #3
    Registered User xds4lx's Avatar
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    Originally posted by Sebastiani
    Code:
     int address = 1000;
     int * ptr = (int*)address;
     *ptr = 175; //... cross fingers :D ...
    hehehe

  4. #4
    Banned master5001's Avatar
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    You could just do this:

    Code:
    int *ptr = (int *)02400000; //yes this is an octal number, I never use them.
    *ptr = ~*ptr;
    
    // Should be in the video card range somewhere.
    But you shouldn't be doing this anyway. I saw this exact question on the boards earlier. Doing this is not a good idea if you don't know what you are doing. By virtue of the fact that you don't know how to do this I'd say that you shouldn't be doing this sort of thing.

  5. #5
    Just a Member ammar's Avatar
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    >>*ptr = ~*ptr;
    What is this line used for, is the ~ the compliment.
    So how does it work?
    Last edited by ammar; 12-10-2002 at 03:48 AM.
    none...

  6. #6
    End Of Line Hammer's Avatar
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    >>I saw this exact question on the boards earlier.
    http://www.cprogramming.com/cboard/s...threadid=30224
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  7. #7
    Registered User
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    What's the difference betwem
    Code:
    int address = 1000;
    int *ptr = (int*)address;
    and
    Code:
    int address = 1000;
    int *ptr = address;
    - It may be because I haven't yet used CAST, but please explain.

    *EDIT*

    Furthermore I don't get what the point is about this:
    int *ptr = (int *)02400000;
    Last edited by Zahl; 12-10-2002 at 07:44 AM.
    Well english isn't my first language, (it's instead a useless language called danish which only 5 milion people speak!!) so if you think my grammar SUCKS (it does by the way) than you're more then welcome to correct me.
    Hell I might even learn something

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