哪里的化合物/字符串将存储在内存? [英] Where does the compound/string literals get stored in the memory?
问题描述
我读了;
文字的化合物是C99的功能,可用于创建一个没有名字的数组。请看例子:
块引用>为int * p =(INT []){3,0,3,4,1};
P
指向一个包含五元素的数组3,0,3,4的第一个元素
,和1
。
块引用>其实我想知道,这是数组将存储在内存或没有,因为它不会有名字吗?结果
的情况下,换句话说
在的char *海峡=你好
其中字符串
你好
将存储在内存中?解决方案使用指针运算。因此,
P [0],第[1],...
或
* P *(P + 1),...
这里的事情。在C中,你有一个像
INT
基本类型漂亮的文字和<$ C $ C>字符,甚至是字符串。因此,我们可以很容易地说这样的话INT长度(字符* S);
INT LEN =长度(你好,世界!);在C99,概念的复合文字的加入来处理数组文本和结构体文字。因此,我们现在可以说这样的话:
INT总和(int类型的[],INT N);
INT总=总和((INT []){17,42},2);这是使用文字重新present阵列文字的化合物。
其实我想知道,这是数组将存储在内存或没有,因为它不会有一个名字?
块引用>是的,在内存中。
我觉得你的困惑源于此。
P
都有一个名字。(INT []){3,0,3,4,1}
没有。它只是恰巧,P
的值为的地址(INT []){3,0,3,4,1}
。当然,(INT []){3,0,3,4,1}
是在内存中;这将是在对可执行的数据段。你只是没有与引用它的任何名称。I read that ;
A compound literal is a C99 feature that can be used to create an array with no name. Consider the example:
int *p = (int []){3, 0, 3, 4, 1};
p
points to the first element of a five- element array containing3, 0, 3, 4
, and1
.Actually I want to know, Is this array will stored in memory or not as it doesn't have a name?
In other words in case ofchar* str = "hello"
Where the string
"hello"
will stored in memory?解决方案Using pointer arithmetic. So
p[0], p[1], ...
or
*p, *(p + 1), ...
Here's the thing. In C, you have nice literals for primitive types like
int
andchar
, and even string literals. So, we can easily say things likeint length(char *s); int len = length("Hello, World!");
In C99, the concept of compound literals was added to handle "array literal" and "struct literal". Therefore, we can now say things like:
int sum(int a[], int n); int total = sum((int []){ 17, 42 }, 2);
This is using a compound literal to represent an "array literal".
Actually I want to know, Is this array will stored in memory or not as it doesn't have a name?
Yes, in memory.
I think your confusion stems from this.
p
has a name.(int []){3, 0, 3, 4, 1}
does not. It just so happens thatp
's value is the address of(int []){3, 0, 3, 4, 1}
. Of course(int []){3, 0, 3, 4, 1}
is in memory; it will be in the data segment for your executable. You just don't have any name with which to refer to it.这篇关于哪里的化合物/字符串将存储在内存?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!