#define DATA7 ((DATA_BUF & BYTE_BIT7) = 0)

#define DATA7 ((DATA_BUF & BYTE_BIT7) = 0) #define LED1 1 //P01 #define EN_LED1() {GP0CON &=~(uint32)(0 #define NT_SUCCESS(Status) ((NTSTATUS)(status)>=0) #define TXEN_1 (PORTB|=BIT(0)) #include #include #define TRUE 1 #define FALSE 0 #define OK #define 比如说#define PI=3.4 #define COMPKEY_TERMINATE ((UINT_PTR) 0) #define TURE 1 #define FALSE 0 #define OK 1 #define ERROR 0 下面的 #define KEY_ESC 0x01 #define KEY_SPACE 0x39 #define KEY_ 括号匹配检验程序#include#include#define TRUE 1#define FALSE 0#define #define OK 1 #define ERROR 0 #define OVERFLOW -2这些定义有什么作用 #define X 3 #define Y X*2 #undef X #define X 2 int z=Y; z 的值