case标签不会减少为整数常量 [英] case label does not reduce to an integer constant
问题描述
嗨！我是C的新手，我从GCC 4.0收到错误，并且
跟随函数：
unsigned int search_for_clo_tag（const unsigned char * array，const
unsigned int array_element）{
unsigned char clo_tag;
unsigned int i;
unsigned char ope_tags [1];
switch（*（array + array_element））{
case''（'' '：
clo_tag =''''';
* ope_tags =''['';
*（ope_tags + 1）=''{'';
休息;
case''['' ：
clo_tag ='']'';
* ope_tags =''（'';
*（ope_tags + 1）=''{'';
休息;
case''{''：
clo_tag =''}'';
* ope_tags =''（'';
*（ope_tags + 1）=''['';
bre ak;
}
for（i = 1; *（array + array_element + i）！=''\''' ; i ++）
switch（*（array + array_element + i））{
case *（array + array_element）：case * ope_tags ：case *（ope_tags + 1）：
if（！must_be_ignored（array，array_element + i））
i = search_for_clo_tag（array， array_element + i） - array_element;
休息;
case clo_tag：
if（ ！must_be_ignored（array，array_element + i））
返回array_element + i;
休息;
}
}
错误是：案例标签不会减少到整数常量和
它与第二个开关有关。我不明白为什么会这样，
因为字符是整数，对吧？
嗯，希望你能帮助我。谢谢，祝你好运！
PS：对不起我的英文。我来自阿根廷，：P
Hi! I''m pretty new to C and I''am getting an error from GCC 4.0 with the
following function:
unsigned int search_for_clo_tag (const unsigned char *array, const
unsigned int array_element) {
unsigned char clo_tag;
unsigned int i;
unsigned char ope_tags[1];
switch (*(array + array_element)) {
case ''('':
clo_tag = '')'';
*ope_tags = ''['';
*(ope_tags + 1) = ''{'';
break;
case ''['':
clo_tag = '']'';
*ope_tags = ''('';
*(ope_tags + 1) = ''{'';
break;
case ''{'':
clo_tag = ''}'';
*ope_tags = ''('';
*(ope_tags + 1) = ''['';
break;
}
for (i = 1; *(array + array_element + i) != ''\0''; i++)
switch (*(array + array_element + i)) {
case *(array + array_element): case *ope_tags: case *(ope_tags + 1):
if (!must_be_ignored (array, array_element + i))
i = search_for_clo_tag (array, array_element + i) - array_element;
break;
case clo_tag:
if (!must_be_ignored (array, array_element + i))
return array_element + i;
break;
}
}
The error is: "case label does not reduce to an integer constant" and
its related to the second switch. I don''t understand why this happen,
since chars are integers, right?
Well, hope you can help me. Thank you and good luck!
PS: Sorry my English. I''am from Argentina, :P
推荐答案
adelfino写道：
[ ...]
adelfino wrote:
[...]
switch（*（array + array_element + i））{
case *（array + array_element）：case * ope_tags：case *（ope_tags + 1 ）：
这些情况都不是整数常量
[...]
case clo_tag：
也不是这一个
错误是：案例标签不会减少到整数常量和它相关的第二个开关。我不明白为什么会这样，
因为字符是整数，对吗？
switch (*(array + array_element + i)) {
case *(array + array_element): case *ope_tags: case *(ope_tags + 1):
none of these cases are integer constants
[...]
case clo_tag:
nor is this one
The error is: "case label does not reduce to an integer constant" and
its related to the second switch. I don''t understand why this happen,
since chars are integers, right?
那又怎样？变量不是常量。
So what? variables are not constants.
哦，我明白了。
现在我将不得不弄明白如何做这样的事情/>
变量。
谢谢Martin！
Oh, I get it.
Now I will have to figure out how to do something like that without
variables.
Thank you Martin!
adelfino写道：
adelfino wrote:
哦，我明白了。
现在我必须弄清楚如何在没有
变量的情况下做这样的事情。
谢谢Martin！
Oh, I get it.
Now I will have to figure out how to do something like that without
variables.
Thank you Martin!
我更喜欢切换案例中的'else if'模型。这样的东西..
if（expr1）
do1（）;
else if（expr2）
do2（）;
else if（expr3）
do3（）;
else
DO0（）; / *当所有其他方法都失败时* /
-
Joe Wright
所有事情都应尽可能简单，但并不简单。
---阿尔伯特爱因斯坦---
I prefer the ''else if'' model to the switch cases. Something like this..
if (expr1)
do1();
else if (expr2)
do2();
else if (expr3)
do3();
else
do0(); /* when all else fails */
--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---
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