error: 8.13802e+06 is outside the range of representable values of type 'unsigned char'

Question

接近尾声我遇到了一个我无法解决的问题。也许你们中的一个可以：

以下代码的编译工作正常，但是当我启动程序时，我收到此错误消息：

helpers.c:228:42：运行时错误：8.13802e+06 超出了 'unsigned char'

类型的可表示值范围

该代码是一个按块模糊图像的函数，但是第一个像素 [0][0] 没有获得正确的平均值，我不知道为什么我会收到该错误消息。

    // Blur image
    void blur(int height, int width, RGBTRIPLE image[height][width])
    {
        int i;
        int j;
        int m;
        int n;
        int averageRed;
        int averageBlue;
        int averageGreen;
        RGBTRIPLE average[height][width];




// For each row of the image...
    for (i = 0; i < height; i++)
    {
        //...take each pixel.
        for (j = 0; j < width; j++)


                //If current height equals 0 AND current width equals 0..   
                if (i == 0 && j == 0)
                {   
                    //..take 2 rows of the picture..
                    for (m = i; m <= i + 1; m++)
                    {   
                        //..and take 2 pixels of each row.
                        for (n = j; n <= j + 1; n++)
                        {
                        //Sum up the rgb-values for each of the 2 pixel of the 2 rows.
                        averageRed = averageRed + image[m][n].rgbtRed;
                        averageGreen = averageGreen + image[m][n].rgbtGreen;                                        
   -> The error line averageBlue = averageBlue + image[m][n].rgbtBlue;
                        }
                    }
                    //Save the average of the values in a separate array after the 2x2 pixel-block
                    average[i][j].rgbtRed = round((float)averageRed / 4);
                    average[i][j].rgbtGreen = round((float)averageGreen / 4);
                    average[i][j].rgbtBlue = round((float)averageBlue / 4);

                    //Set average-variables to 0
                    averageRed = 0;
                    averageGreen = 0;
                    averageBlue = 0;
                }


        //From each row of the image...
        for (i = 0; i < height; i++)
        {
            //...take each pixel..
            for (j = 0; j < width; j++)
            {
                //...and update the original value with the temporary stored value.
                image[i][j].rgbtRed = average[i][j].rgbtRed;
                image[i][j].rgbtGreen = average[i][j].rgbtGreen;
                image[i][j].rgbtBlue = average[i][j].rgbtBlue;
            }
        }

    }

提前感谢任何提示！

Answer 1

另一个 facepalm-answer :-)..

解决方案非常简单。这只是缺少 averageRed/Green/Blue-variables.

的初始化

没有得到它，因为错误消息仅指向 averageBlue。

再次感谢 M Oehm :-)

error: 8.13802e+06 is outside the range of representable values of type 'unsigned char'

error: 8.13802e+06 is outside the range of representable values of type 'unsigned char'

c

runtime

blur

cs50