Math problems, I think...

This is a discussion on Math problems, I think... within the C++ Programming forums, part of the General Programming Boards category; Hey, Stupidity has brought me here again. Can anyone tell me why I just get a bunch of 'non-lvalue' s ...

  1. #1
    Registered User
    Join Date
    Oct 2006
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    118

    Question Math problems, I think...

    Hey,

    Stupidity has brought me here again.

    Can anyone tell me why I just get a bunch of 'non-lvalue' s on this?

    Code:
    #include <iostream>
    
    using namespace std;
    
    class CalculateCube
    {
    public:
            CalculateCube();
            ~CalculateCube();
            void CalculatePointsFromValues(int centerX, int centerY, int size);
            int CenterPointGivenX;
            int CenterPointGivenY;
            int SizeGiven;
            int PointOneX;
            int PointOneY;
            int PointTwoX;
            int PointTwoY;
            int PointThreeX;
            int PointThreeY;
            int PointFourX;
            int PointFourY;
            int PointFiveX;
            int PointFiveY;
            int PointSixX;
            int PointSixY;
            int PointSevenX;
            int PointSevenY;
            int PointEightX;
            int PointEightY;
        protected:
            int HalfSizeGiven;
    };
    
    CalculateCube::CalculateCube()
    {
    
    }
    
    CalculateCube::~CalculateCube()
    {
    
    }
    
    void CalculateCube::CalculatePointsFromValues(int centerX, int centerY, int size)
    {
        CenterPointGivenX = centerX;
        CenterPointGivenY = centerY;
        SizeGiven = size;
    
        SizeGiven / 2 = HalfSizeGiven;
    
        CenterPointGivenX + HalfSizeGiven = PointOneX;
        CenterPointGivenX + HalfSizeGiven = PointTwoX;
        CenterPointGivenX + HalfSizeGiven = PointThreeX;
        CenterPointGivenX + HalfSizeGiven = PointFourX;
    
        CenterPointGivenX - HalfSizeGiven = PointFiveX;
        CenterPointGivenX - HalfSizeGiven = PointSixX;
        CenterPointGivenX - HalfSizeGiven = PointSevenX;
        CenterPointGivenX - HalfSizeGiven = PointEightX;
    
        CenterPointGivenY + HalfSizeGiven = PointOneY;
        CenterPointGivenY + HalfSizeGiven = PointTwoY;
        CenterPointGivenY + HalfSizeGiven = PointFiveY;
        CenterPointGivenY + HalfSizeGiven = PointSixY;
    
        CenterPointGivenY - HalfSizeGiven = PointThreeY;
        CenterPointGivenY - HalfSizeGiven = PointFourY;
        CenterPointGivenY - HalfSizeGiven = PointSevenY;
        CenterPointGivenY - HalfSizeGiven = PointEightY;
    }
    Thanks!
    FlyingIsFun1217

  2. #2
    Deathray Engineer MacGyver's Avatar
    Join Date
    Mar 2007
    Posts
    3,211
    You've got all of your assignments backwards...

    Code:
    int a = 5, b = 6, c = 7;
    ...
    a = b + c; /* Right! */
    b + c = a; /* WRONG WRONG WRONG */
    ...

  3. #3
    Registered User
    Join Date
    Sep 2006
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    835
    The last 17 equations of your code don't have valid lvalues (i.e., the expression on the left that you're trying to assign to, can't be).

  4. #4
    Registered User
    Join Date
    Oct 2006
    Posts
    118
    Ok, didn't realize it had to be in that order
    Thanks for helping me

    FlyingIsFun1217

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