#include <colour.h>
string calc_colour( int red, int green, int blue, int whitener ) {
string result;
result = "";
if ( whitener > -1 ) {
switch ( red + green + blue ) {
case 0 .. 4 :
return "colourless";
case 5 .. 29 :
result += "faint ";
break;
case 30 .. 154 :
break;
default :
result += "intense ";
}
}
return result;
} /* calc_colour() */