CS50 Pset 4 模糊 |二进制表达式的无效操作数

Question

目前正在为 CS50 的 Pset4 开发模糊功能

这是很多文字，可能不是最理想的做事方式，但我现在并不担心。

void blur(int height, int width, RGBTRIPLE image[height][width])
{
    
    // Set blur as a RGBTRIPLE 
    RGBTRIPLE blur[1][1];
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {
            // Check for corner or edge
            if (i == 0 && j == 0) // If top left corner
            {
                blur[i][j].rgbtBlue = (image[i][j].rgbtBlue + image[i][j + 1].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j + 1].rgbtBlue) / 4;
                blur[i][j].rgbtGreen = (image[i][j].rgbtGreen + image[i][j + 1].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j + 1].rgbtGreen) / 4;
                blur[i][j].rgbtRed = (image[i][j].rgbtRed + image[i][j + 1].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j + 1].rgbtRed) / 4;
            }
            else if (i == 0 && j == (width - 1)) // If top right corner
            {
                blur[i][j].rgbtBlue = (image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j - 1].rgbtBlue) / 4;
                blur[i][j].rgbtGreen = (image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j - 1].rgbtGreen) / 4;
                blur[i][j].rgbtRed = (image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j - 1].rgbtRed) / 4;
            }
            else if (i == (height - 1) && j == 0) // If bottom left corner
            {
                blur[i][j].rgbtBlue = (image[i][j].rgbtBlue + image[i][j + 1].rgbtBlue + image[i + 1][j].rgbtBlue + image[i + 1][j + 1].rgbtBlue) / 4;
                blur[i][j].rgbtGreen = (image[i][j].rgbtGreen + image[i][j + 1].rgbtGreen + image[i + 1][j].rgbtGreen + image[i + 1][j + 1].rgbtGreen) / 4;
                blur[i][j].rgbtRed = (image[i][j].rgbtRed + image[i][j + 1].rgbtRed + image[i + 1][j].rgbtRed + image[i + 1][j + 1].rgbtRed) / 4;
            }
            else if (i == (height - 1) && j == (width - 1)) // If bottom right corner
            {
                blur[i][j].rgbtBlue = (image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i + 1][j].rgbtBlue + image[i + 1][j - 1].rgbtBlue) / 4;
                blur[i][j].rgbtGreen = (image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i + 1][j].rgbtGreen + image[i + 1][j - 1].rgbtGreen) / 4;
                blur[i][j].rgbtRed = (image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i + 1][j].rgbtRed + image[i + 1][j - 1].rgbtRed) / 4;
            }
            else if (i == 0) // If top edge
            {
                blur[i][j].rgbtBlue = (image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i][j + 1].rgbtBlue + image[i + 1][j - 1].rgbtBlue + image[i + 1][j].rgbtBlue + image[i + 1][j + 1].rgbtBlue) / 6;
                blur[i][j].rgbtGreen = (image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i][j + 1].rgbtGreen + image[i + 1][j - 1].rgbtGreen + image[i + 1][j].rgbtGreen + image[i + 1][j + 1].rgbtGreen) / 6;
                blur[i][j].rgbtRed = (image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i][j + 1].rgbtRed + image[i + 1][j - 1].rgbtRed + image[i + 1][j] + image[i + 1][j + 1]) / 6;
            }
            else if (j == 0) // If left edge
            {
                blur[i][j].rgbtBlue = (image[i + 1][j].rgbtBlue + image[i + 1][j + 1].rgbtBlue + image[i][j].rgbtBlue + image[i][j + 1].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j + 1].rgbtBlue) / 6;
                blur[i][j].rgbtGreen = (image[i + 1][j].rgbtGreen + image[i + 1][j + 1].rgbtGreen + image[i][j].rgbtGreen + image[i][j + 1].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j + 1].rgbtGreen) / 6;
                blur[i][j].rgbtRed = (image[i + 1][j].rgbtRed + image[i + 1][j + 1].rgbtRed + image[i][j].rgbtRed + image[i][j + 1].rgbtRed + image[i - 1][j] + image[i - 1][j + 1]) / 6;
            }
            else if (i == (height - 1)) // If bottom edge
            {
                blur[i][j].rgbtBlue = (image[i + 1][j].rgbtBlue + image[i + 1][j + 1].rgbtBlue + image[i + 1][j - 1].rgbtBlue + image[i][j + 1].rgbtBlue + image[i][j].rgbtBlue + image[i][j + 1].rgbtBlue) / 6;
                blur[i][j].rgbtGreen = (image[i + 1][j].rgbtGreen + image[i + 1][j + 1].rgbtGreen + image[i + 1][j - 1].rgbtGreen + image[i][j + 1].rgbtGreen + image[i][j].rgbtGreen + image[i][j + 1].rgbtGreen) / 6;
                blur[i][j].rgbtRed = (image[i + 1][j].rgbtRed + image[i + 1][j + 1].rgbtRed + image[i + 1][j - 1].rgbtRed + image[i][j + 1].rgbtRed + image[i][j] + image[i][j + 1]) / 6;
            }
            else if (j == (width - 1)) // If right edge
            {
                blur[i][j].rgbtBlue = (image[i + 1][j].rgbtBlue + image[i + 1][j - 1].rgbtBlue + image[i][j].rgbtBlue + image[i][j - 1].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j - 1].rgbtBlue) / 6;
                blur[i][j].rgbtGreen = (image[i + 1][j].rgbtGreen + image[i + 1][j - 1].rgbtGreen + image[i][j].rgbtGreen + image[i][j - 1].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j - 1].rgbtGreen) / 6;
                blur[i][j].rgbtRed = (image[i + 1][j].rgbtRed + image[i + 1][j - 1].rgbtRed + image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i - 1][j] + image[i - 1][j - 1]) / 6;
            }
            else
            {
            // Calculate blur value for each RGB
            blur[i][j].rgbtBlue = (image[i - 1][j - 1].rgbtBlue + image[i - 1][j].rgbtBlue + image[i - 1][j + 1].rgbtBlue +
            image[i][j - 1].rgbtBlue + image[i][j].rgbtBlue + image[i][j + 1].rgbtBlue + 
            image[i + 1][j - 1].rgbtBlue + image[i + 1][j].rgbtBlue + image[i + 1][j + 1].rgbtBlue) / 9;
            
            blur[i][j].rgbtGreen = (image[i - 1][j - 1].rgbtGreen + image[i - 1][j].rgbtGreen + image[i - 1][j + 1].rgbtGreen +
            image[i][j - 1].rgbtGreen + image[i][j].rgbtGreen + image[i][j + 1].rgbtGreen + 
            image[i + 1][j - 1].rgbtGreen + image[i + 1][j].rgbtGreen + image[i + 1][j + 1].rgbtGreen) / 9;
            
            blur[i][j].rgbtRed = (image[i - 1][j - 1].rgbtRed + image[i - 1][j].rgbtRed + image[i - 1][j + 1].rgbtRed +
            image[i][j - 1].rgbtRed + image[i][j].rgbtRed + image[i][j + 1].rgbtRed + 
            image[i + 1][j - 1].rgbtRed + image[i + 1][j].rgbtRed + image[i + 1][j + 1].rgbtRed) / 9;
            
            // Change each RGB value of pixel to blur value
            image[i][j].rgbtBlue = blur[i][j].rgbtBlue;
            image[i][j].rgbtGreen = blur[i][j].rgbtGreen;
            image[i][j].rgbtRed = blur[i][j].rgbtRed;
            }
        }
    }
    return;
}

当我编译时，我得到了这个：

**helpers.c:104:141: error: invalid operands to binary
      expression ('int' and 'RGBTRIPLE')
  ...image[i + 1][j].rgbtRed + image[i + 1][j - 1].rgbtRed + image[i][j].rgbtRed + image[i][j - 1].rgbtRed + image[i - 1][j]...
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~**

当我检查边缘时，它只显示 rgbtRed 值

我很困惑，因为如果我去掉检查边缘的语句，它编译得很好。即使是检查角落的那些也能正常工作。

如果你们知道发生了什么，请帮助我。谢谢！

Answer 1

...image[i][j + 1].rgbtRed + image[i][j] + image[i][j + 1]) / 6;

我相信您忘记将 .rgbtRed 放在 4 次边缘检查的最后一行。