#define TAG_1 "a"
#define TAG_2 "b"
#define TAG_3 "c"

if ((unsigned long)GetTagDouble (TAG_1))
return CO_RED;

if ((unsigned long)GetTagDouble (TAG_2))
return CO_GREEN;

if ((unsigned long)GetTagDouble (TAG_3))
return CO_MAGENTA;

else
return CO_BLACK;
}


上面一段C，都是当abc各自为1的时候执行各自的颜色变化，我想让第一个变量a为0时颜色为红，如何修改，请大虾指教。