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特殊符号##
“##”是一种分隔连接方式，它的作用是先分隔，然后进行强制连接。
例如:
#define TYPE(num) t_num_t
上面的程序程序当调用 TYPE(3)时,本身想宏替换为 t_3_t,但是实际还是会是 t_num_t,因为 t_num_t
是一个整体，那么这个时候可以改用这样一种方式：
#define TYPE(num) t_##num##_t
这样的话程序在处理的时候就会看成是三个部分 t_，num，_t,就能正确替换为 t_3_t.
宏定义的{…}写法和 do{…}while(0)写法
第一种情况：当我们定义一个宏定义时 例如：
#define TYPE(num)
如果我们空定义的话，那么当我们来引用它时就会报警告，于是我们可以选择这样：
#define TYPE(num) do{}while(0)
这样就能避免警告
第二种情况：当我们定义一个宏如下：
#define TYPE()\ {fun1(); fun2();}
当我们这样去引用它时：
if(...) TYPE(); else //error parse error before else fun();
会出现错误,因为替换后会多出一个分号，为了避免这样的宏定义错误，建议定义复杂 的宏时使用 do{}while(0)的方式：
#define TYPE()\ do {fun1(); fun2();}while(0)
