MSVC++ error

This is a discussion on MSVC++ error within the C++ Programming forums, part of the General Programming Boards category; I only get this problem with this compiler ( MSVC++ 6.0 ). Here is the code in question Code: if ...

  1. #1
    i dont know Vicious's Avatar
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    MSVC++ error

    I only get this problem with this compiler ( MSVC++ 6.0 ).

    Here is the code in question

    Code:
    if ( Display [ x + ( y * max_width ) ] != 0 )
    Display is an unsigned char array. I get this error

    Code:
     error C2108: subscript is not of integral type
    !?
    What is C++?

  2. #2
    VA National Guard The Brain's Avatar
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    MSVC doesn't like the stuff that is inside the [] for some reason..

    I think [ x + ( y * max_width ) ] should resolve to an unsigned integer....

    Try adding a cout << x + ( y * max_width ) and see what ye' get
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
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  3. #3
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    std::cout << x + ( y * max_width );

    that worked fine.

    x, y, and max_width are floats. BUT I tried changing them to different types and it gives me the same error.

    EDIT:
    AH, I tried changing them to int again and it worked.
    Lemme see if I can resolve the problem.
    Last edited by Vicious; 09-26-2004 at 09:50 PM.
    What is C++?

  4. #4
    VA National Guard The Brain's Avatar
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    hmmm... a floating point array subscript may be your problem.. a simple cast to integer should fix the problem...


    give this a try...

    Code:
    display[(int)x +(int) ( y * max_width )]
    Last edited by The Brain; 09-27-2004 at 02:30 AM.
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
    • "Data Structures and Other Objects using C++" -Walter Savitch
    • "Assembly Language for Intel-Based Computers" -Kip Irvine
    • "Programming Windows, 5th edition" -Charles Petzold
    • "Visual C++ MFC Programming by Example" -John E. Swanke
    • "Network Programming Windows" -Jones/Ohlund
    • "Sams Teach Yourself Game Programming in 24 Hours" -Michael Morrison
    • "Mathmatics for 3D Game Programming & Computer Graphics" -Eric Lengyel

  5. #5
    i dont know Vicious's Avatar
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    I changed all of the variables involved to ints. I figured it would be faster that converting all the time.

    Thanks for your help!
    What is C++?

  6. #6
    VA National Guard The Brain's Avatar
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    righteous.
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
    • "Data Structures and Other Objects using C++" -Walter Savitch
    • "Assembly Language for Intel-Based Computers" -Kip Irvine
    • "Programming Windows, 5th edition" -Charles Petzold
    • "Visual C++ MFC Programming by Example" -John E. Swanke
    • "Network Programming Windows" -Jones/Ohlund
    • "Sams Teach Yourself Game Programming in 24 Hours" -Michael Morrison
    • "Mathmatics for 3D Game Programming & Computer Graphics" -Eric Lengyel

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