使用宏将常量连接到常量字符串 [英] concatenate a constant to constant string using macros
问题描述
如何连接哈希定义的恒定值到另一个哈希
定义常量字符串。例如
#define ABC 100
#define MYSTR" ABC的价值是
现在我需要一个将ABC的值连接到MYSTR的字符串。
我在编译时需要这个。
结果常量字符串应该是ABC的价值是100
我怎么能这样做。
谢谢
sinbad
how to concatenate a "hash defined" constant value to another "hash
defined" constant string. For example
#define ABC 100
#define MYSTR "The value of ABC is"
Now i need a string that will concatenate the value of ABC to MYSTR .
I need this at compile time.
The resultant constant string should be "The value of ABC is 100"
How can i do this.
thanks
sinbad
推荐答案
" sinbad" < si *********** @ gmail.com写信息
新闻：76 ******************* *************** @ x19g2000 prg.googlegroups.com ...
"sinbad" <si***********@gmail.comwrote in message
news:76**********************************@x19g2000 prg.googlegroups.com...
hi，
如何连接哈希定义的恒定值到另一个哈希
定义常量字符串。例如
#define ABC 100
#define MYSTR" ABC的价值是
现在我需要一个将ABC的值连接到MYSTR的字符串。
我在编译时需要这个。
结果常量字符串应该是ABC的价值是100
我怎么能这样做。
how to concatenate a "hash defined" constant value to another "hash
defined" constant string. For example
#define ABC 100
#define MYSTR "The value of ABC is"
Now i need a string that will concatenate the value of ABC to MYSTR .
I need this at compile time.
The resultant constant string should be "The value of ABC is 100"
How can i do this.
你可以这样做：
__________________________________________________ ___________________
#include< stdio.h>
#define QUOTE_X（t）#t
#define QUOTE（t）QUOTE_X（t）
#define ABC 100
#define MYSTR" ABC的价值是
int main（）{
char const concat [ ] = MYSTR " QUOTE（ABC）;
printf（"％s \ n"，concat）;
/ * --------- -------------------------------------------------- - * /
put（" \\\\ _______________________ \
___________________________________ \ npress< ENTER to exit ..."）;
getchar（）;
返回0;
}
__________________________________________________ ___________________
You can do something like:
__________________________________________________ ___________________
#include <stdio.h>
#define QUOTE_X(t)#t
#define QUOTE(t)QUOTE_X(t)
#define ABC 100
#define MYSTR "The value of ABC is"
int main() {
char const concat[] = MYSTR " " QUOTE(ABC);
printf("%s\n", concat);
/*------------------------------------------------------------*/
puts("\n\n_______________________\
___________________________________\npress <ENTERto exit...");
getchar();
return 0;
}
__________________________________________________ ___________________
sinbad写道：
sinbad wrote:
hi，
如何连接hash defined"恒定值到另一个哈希
定义常量字符串。例如
#define ABC 100
#define MYSTR" ABC的价值是
现在我需要一个将ABC的值连接到MYSTR的字符串。
我在编译时需要这个。
结果常量字符串应该是ABC的价值是100
我怎么能这样做。
how to concatenate a "hash defined" constant value to another "hash
defined" constant string. For example
#define ABC 100
#define MYSTR "The value of ABC is"
Now i need a string that will concatenate the value of ABC to MYSTR .
I need this at compile time.
The resultant constant string should be "The value of ABC is 100"
How can i do this.
这是comp.lang.c中的问题11.17。经常
问题（FAQ）列表在< http：// www .c-faq.com /> ;.
那里给出的解决方案适用于你所展示的ABC，
但是如果你有像这样的东西>
#define ABC（24 + 18）
你会得到ABC的价值是（24 + 18），而不是... 42。
-
Eric Sosman
es ***** @ ieee-dot-org.inva 盖子
6月18日，8：01 * am，Chris Thomasson < cris ... @ comcast.netwrote：
On Jun 18, 8:01*am, "Chris Thomasson" <cris...@comcast.netwrote:
" sinbad" < sinbad.sin ... @ gmail.com写信息
新闻：76 ********************* ************* @ x19g2000 prg.googlegroups.com ...
"sinbad" <sinbad.sin...@gmail.comwrote in message
news:76**********************************@x19g2000 prg.googlegroups.com...
hi，
how连接散列定义的恒定值到另一个哈希
定义常量字符串。例如
how to concatenate a "hash defined" constant value to another "hash
defined" constant string. For example
#define ABC 100
#define ABC 100
#define MYSTR" ; ABC的价值是
#define MYSTR "The value of ABC is"
现在我需要一个将ABC的值连接到MYSTR的字符串。
我在编译时需要这个。
Now i need a string that will concatenate the value of ABC to MYSTR .
I need this at compile time.
结果常量字符串应为ABC的值为100。
The resultant constant string should be "The value of ABC is 100"
我该怎么做？
How can i do this.
您可以这样做：
__________________________________________________ ___________________
#include< stdio.h>
#define QUOTE_X（t）#t
#define QUOTE（t）QUOTE_X（t）
#define ABC 100
#define MYSTR" ABC的价值是
int main（）{
* char const concat [] = MYSTR " QUOTE（ABC）;
* printf（"％s \ n"，concat）;
/ * -------- -------------------------------------------------- - * /
* put（" \\\\ _______________________ \
___________________________________ \ npress< ENTER to exit ..."）;
* getchar（）;
*返回0;
}
__________________________________________________ ___________________
You can do something like:
__________________________________________________ ___________________
#include <stdio.h>
#define QUOTE_X(t)#t
#define QUOTE(t)QUOTE_X(t)
#define ABC 100
#define MYSTR "The value of ABC is"
int main() {
* char const concat[] = MYSTR " " QUOTE(ABC);
* printf("%s\n", concat);
/*------------------------------------------------------------*/
* puts("\n\n_______________________\
___________________________________\npress <ENTERto exit...");
* getchar();
* return 0;
}
__________________________________________________ ___________________
chris，
但我需要在编译时这样做，因为我不能使用代码
你用main（）函数写的。
因为我只会在执行期间得到结果字符串。
谢谢
sinbad
chris,
But i need to do this at compile time, meaing i can''t use the code
u''ve written in main () function.
Because i will get the resultant string only during execution time.
thanks
sinbad
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