如何在C中将RGB分量转换为百分比？

unsigned char red = 45;
float percentage = red/255.0f;

int rgbValue = 123;
float fpValue = rgbValue / 255.0;

//Color Component Percents
#define CCP_ALPHA(argb) (((argb) & 0xFF000000) >> 24)   / 255.0f
#define CCP_RED(rgb)    (((rgb) & 0xFF0000) >> 16)      / 255.0f
#define CCP_GREEN(rgb)  (((rgb) & 0xFF00) >> 8)         / 255.0f
#define CCP_BLUE(rgb)   ((rgb) & 0xFF)                  / 255.0f


int main(int argc, char *argv[])
{
    int argb = 0xCCDD33EE;
    printf(\"Alpha %.2f%%\\nRed %.2f%%\\nGreen %.2f%%\\nBlue %.2f%%\\n\",
           CCP_ALPHA(argb) * 100,
           CCP_RED(argb) * 100,
           CCP_GREEN(argb) * 100,
           CCP_BLUE(argb) * 100);
}

Alpha 80.00%
Red 86.67%
Green 20.00%
Blue 93.33%