C语言中“｜”符号的问题

LichY 2012-08-29 03:29:25

程序开头有这样的定义：
/*the fixed colors*/
#define BLACK 0
#define YELLOW(RED | GREEN)
#define MAGENTA(RED | BLUE)
#define CYAN(GREEN | BLUE)
#define WHITE(RED | GREEN | BLUE)
运行的时候提示错误是这样的：
test.c
C:\Documents and Settings\Administrator\test.c(15) : error C2010: '|' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(15) : error C2010: 'G' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(16) : error C2010: '|' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(16) : error C2010: 'B' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(17) : error C2010: '|' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(17) : error C2010: 'B' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(18) : error C2010: '|' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(18) : error C2010: 'G' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(18) : error C2010: '|' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(18) : error C2010: 'B' : unexpected in macro formal parameter list
C:\Documents and Settings\Administrator\test.c(35) : error C2065: 'YELLOW' : undeclared identifier
C:\Documents and Settings\Administrator\test.c(41) : error C2065: 'WHITE' : undeclared identifier
C:\Documents and Settings\Administrator\test.c(42) : error C2065: 'MAGENTA' : undeclared identifier
执行 cl.exe 时出错.

请问大家这个是什么问题？我用的是VC++6.0编译环境！谢谢！

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LichY 2012-08-29

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谢谢各位，问题已经了，以后多多学习，认真细心！

ohayou 2012-08-29

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楼上正解
#define macro如果紧接着括号会把括号里的内容当作这个宏的参数

mymtom 2012-08-29

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[Quote=引用 3 楼的回复:]

C/C++ code

/*the fixed colors*/
#define BLACK 0
#define YELLOW (RED | GREEN)
#define MAGENTA (RED | BLUE)
#define CYAN (GREEN | BLUE)
#define WHITE (RED | GREEN | BLUE)
[/Quote]

楼主漏掉了左括号("(")左边的空格或者制表符

兆帅 2012-08-29

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/*the fixed colors*/

#define BLACK 0

#define YELLOW (RED | GREEN)

#define MAGENTA (RED | BLUE)

#define CYAN (GREEN | BLUE)

#define WHITE (RED | GREEN | BLUE)