在C中应用##运算符 [英] application of ## operator in C

问题描述

大家好


什么是应用程序/示例，需要连接2个
预处理器变量。

ie 申请 ## C / C ++中的运算符

i认为它的唯一用途是在编译器构造中，但我怎么也不知道
知道，

请任何一个帮助我。

再见

sandeep

解决方案

8月21日，下午6:38，mail2sandee ... @ gmail.com

< mail2sandee ... @ gmail.comwrote：

大家好


什么是应用程序/示例，需要连接2个
预处理器变量。

即应用程序" ## C / C ++中的运算符

i认为它的唯一用途是在编译器构造中，但我怎么也不知道
知道，

请任何一个帮助我。

再见

sandeep

它用于字符串文字中的宏替换。

它也被称为字符串化运算符。

它用于避免警告消息，如

"警告：字符串文字中的宏替换


#define MYPRINTF（var，fmt）\

printf（" MYPRINTF Prints"＃var" =" #fmt" \\\
" ;，var）


所以调用如 - MYPRINTF（i，％d）;

将扩展为 - printf（" MYPRINTF Prints i =％ d \ n，i）;


希望这会有所帮助。


最诚挚的问候，

Karthik Balaguru

8月21日上午9:56，karthikbalaguru< karthikbalagur ... @ gmail.com>

写道：

8月21日下午6:38，mail2sandee ... @ gmail.com


< mail2sandee ... @ gmail .comwrote：

hi all

需要连接的应用程序/示例是什么2

预处理器变量。

即应用程序 ## C / C ++中的运算符

i认为它的唯一用途是在编译器构造中，但我怎么也不知道
知道，

请任何一个帮助我。

再见

sandeep

它用于字符串文字中的宏替换。

它也被称为字符串化运算符。

您正在考虑使用＃运算符，OP询问用于标记粘贴的##

运算符。 />

Robert Gamble

ma ************ @ gmail.com 写道：

hi all


什么是应用程序/示例，需要串联2个
预处理器变量。

即应用程序 ## C / C ++中的运算符

尝试C FAQ， http://c-faq.com/cpp/index.html 可能与问题10.20以后的
相关。

hi all

what are the applications / examples that requires concatenation of 2
pre-processor variables.
i.e applications of " ## " operators in C/C++
i think its only use is in Compiler construction, but how i don''t
know,
pls any one help me.
bye
sandeep

解决方案

On Aug 21, 6:38 pm, "[e-mail]"
<[e-mail]:

hi all

what are the applications / examples that requires concatenation of 2
pre-processor variables.
i.e applications of " ## " operators in C/C++
i think its only use is in Compiler construction, but how i don''t
know,
pls any one help me.
bye
sandeep

It is used for the Macro replacement within a String Literal .
It is also called as stringizing operator .
It is used to avoid the warning message like
"warning : macro replacement within string literal"

#define MYPRINTF(var,fmt) \
printf("MYPRINTF Prints "#var" = "#fmt" \n",var)

so invocations like - MYPRINTF(i,%d);
will be expanded to - printf("MYPRINTF Prints i = %d \n",i);

Hope this helps.

Best Regards,
Karthik Balaguru

On Aug 21, 9:56 am, karthikbalaguru <[e-mail]>
wrote:

On Aug 21, 6:38 pm, "[e-mail]"

<[e-mail]:

hi all

what are the applications / examples that requires concatenation of 2
pre-processor variables.
i.e applications of " ## " operators in C/C++
i think its only use is in Compiler construction, but how i don''t
know,
pls any one help me.
bye
sandeep

It is used for the Macro replacement within a String Literal .
It is also called as stringizing operator .

You are thinking of the # operator, the OP was asking about the ##
operator which is used for token pasting.

Robert Gamble

ma************@gmail.com wrote:

hi all

what are the applications / examples that requires concatenation of 2
pre-processor variables.
i.e applications of " ## " operators in C/C++

Try the C FAQ, http://c-faq.com/cpp/index.html is probably relevant
around question 10.20 onwards.

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