在C中创建和访问非常大的数组 [英] Creating and Accessing Very Big Arrays in C
问题描述
我正在使用GCC。请问您能告诉我，我可以用C创建的最大数量的
数组元素是什么，即
char * anArray =（char *） calloc（?? MAX ??，sizeof（char））;
我设法使用DOUBLE数据类型创建数组，但当我尝试
。为了访问数组，编译器抱怨这个数字不是一个
INT，即
//这个成功
char * anArray =（char *）calloc（999999999999999999，sizeof（char））;
//这不能编译，因为数字1234567891234584不是
INT
anArray [1234567891234584] = 1;
我们非常感谢您的帮助和建议。
感谢你的期待，
Daniel
dj ***** @ gmail.com 写道：
我是usi ng GCC。请问您能告诉我，我可以用C创建的最大数量的
数组元素是什么，即
char * anArray =（char *） calloc（?? MAX ??，sizeof（char））;
取决于你的系统。
我已经设法使用DOUBLE数据类型创建数组，但是当我尝试使用
来访问数组时，编译器会抱怨该数字不是
INT， ie
应该是''int''？
//这成功了
char * anArray =（char *）calloc（999999999999999999，sizeof（char））;
真的吗？
//这不能编译，因为数字1234567891234584不是
INT
anArray [1234567891234584] = 1;
如果你可以分配超过INT_MAX元素，你可能应该
写1234567891234584LL告诉编译器常量是长的
长，否则它将默认为int。
-
Ian Collins。
Ian Collins写道：
dj ***** @ gmail.com 写道：
//这不能编译因为号码1234567891234584不是一个
INT
anArray [1234567891234584] = 1;
如果你可以分配超过INT_MAX的元素，你可能应该用b
写1234567891234584LL告诉编译器常量是长的
long，否则默认为int。
常量总是采用可以代表它们的类型
（除非没有这种类型）。在这种情况下，常数
将很长，而不必指定它 -
假设数字超过LONG_MAX，并且
编译器处于C99模式。
我不知道这个神话来自哪里
无后缀常量有问题。
Old Wolf写道：
Ian Collins写道：
>> dj ***** @ gmail.com写道：
>>> //这不编译，因为数字1234567891234584不是
INT
anArray [1234567891234584] = 1;
如果你可以分配超过INT_MAX元素，你应该可能会写1234567891234584LL告诉编译器常量是长的长，否则会默认为int。
常量总是采用可以代表它们的类型
（除非没有这种类型）。在这种情况下，常数
将很长，而不必指定它 -
假设数字超过LONG_MAX，并且
编译器处于C99模式。
我不知道这个神话来自哪里
无后缀常量有问题。
在我的情况下，昏暗而遥远的过去！
干杯，
-
Ian Collins。
Hi,
I''m using GCC. Please could you tell me, what is the maximum number of
array elements that I can create in C, i.e.
char* anArray = (char*) calloc( ??MAX?? , sizeof(char) ) ;
I''ve managed to create arrays using DOUBLE data types, but when I try
to access the array, the compiler complains that the number is not an
INT, i.e.
// this succeeds
char* anArray = (char*) calloc( 999999999999999999 , sizeof(char) ) ;
// this does not compile because the number 1234567891234584 is not an
INT
anArray[1234567891234584] = 1 ;
Your help and advice would be sinceraly appreciated.
Thanking you in anticipation,
Daniel
dj*****@gmail.com wrote:Hi,
I''m using GCC. Please could you tell me, what is the maximum number of
array elements that I can create in C, i.e.
char* anArray = (char*) calloc( ??MAX?? , sizeof(char) ) ;
Depends on your system.
I''ve managed to create arrays using DOUBLE data types, but when I try
to access the array, the compiler complains that the number is not an
INT, i.e.
Should that be ''int''?
// this succeeds
char* anArray = (char*) calloc( 999999999999999999 , sizeof(char) ) ;
Realy?
// this does not compile because the number 1234567891234584 is not an
INT
anArray[1234567891234584] = 1 ;
If you can allocate more than INT_MAX elements, you should probably
write 1234567891234584LL to tell the compiler the constant is a long
long, otherwise it will default to int.
--
Ian Collins.
Ian Collins wrote:dj*****@gmail.com wrote:// this does not compile because the number 1234567891234584 is not an
INT
anArray[1234567891234584] = 1 ;If you can allocate more than INT_MAX elements, you should probably
write 1234567891234584LL to tell the compiler the constant is a long
long, otherwise it will default to int.Constants always take on a type that can represent them
(unless there is no such type). In this case, the constant
will be a long long without you having to specify it --
assuming that the number exceeds LONG_MAX, and that
the compiler is in C99 mode.
I don''t know where this myth came from that there is
something wrong with un-suffixed constants.
Old Wolf wrote:Ian Collins wrote:
>>dj*****@gmail.com wrote:
>>>// this does not compile because the number 1234567891234584 is not an
INT
anArray[1234567891234584] = 1 ;
If you can allocate more than INT_MAX elements, you should probably
write 1234567891234584LL to tell the compiler the constant is a long
long, otherwise it will default to int.
Constants always take on a type that can represent them
(unless there is no such type). In this case, the constant
will be a long long without you having to specify it --
assuming that the number exceeds LONG_MAX, and that
the compiler is in C99 mode.
I don''t know where this myth came from that there is
something wrong with un-suffixed constants.
In my case, the dim and distant past!
Cheers,
--
Ian Collins.
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