所以char a [] =＆QUOT之间的差异;串英寸;的char * p =＆QUOT;串英寸; [英] Difference between char a[]="string"; char *p="string";

问题描述

可能显示的文件：结果
  <一href=\"http://stackoverflow.com/questions/1704407/what-is-the-difference-between-char-s-and-char-s-in-c\">What是个char []和char * S用C？

什么是之间的差异char的一个​​[] =串; 和的char * p =串; ？

推荐答案

第一种是阵列另一种是指针。

The first one is array the other is pointer.

数组声明烧焦一个[​​6]; 是6个字符的空间预留，由名为被称为请求一。也就是说，有一个名为位置 A 在这六个字符可以坐。该指针声明的char * p; ，另一方面，要求持有一个指针的地方。指针是由名为 P，，可以指向任何字符（字符或连续的数组）的任何地方。

The array declaration "char a[6];" requests that space for six characters be set aside, to be known by the name "a." That is, there is a location named "a" at which six characters can sit. The pointer declaration "char *p;" on the other hand, requests a place which holds a pointer. The pointer is to be known by the name "p," and can point to any char (or contiguous array of chars) anywhere.

中的语句

char a[] = "hello";
char *p = "world";

将导致可能被重新psented这样的$ P $的数据结构：

would result in data structures which could be represented like this:

   +---+---+---+---+---+---+
a: | h | e | l | l | o |\0 |
   +---+---+---+---+---+---+
   +-----+     +---+---+---+---+---+---+
p: |  *======> | w | o | r | l | d |\0 |
   +-----+     +---+---+---+---+---+---+

认识到，如x一个参考文献[3]产生不同code取决于x是否数组或指针是很重要的。鉴于上述声明，当编译器看到前pression一个[3]，它发出code，开始在位置A移动过去三个吧，这里面提取的字符。当看到前pression P [3]，它发出code的位置开始P，取指针值出现，添加三个指针，最后取字符指出。在上面的例子中，两个一[3]和p [3]碰巧是字符L，但是编译器到达那里不同。

It is important to realize that a reference like x[3] generates different code depending on whether x is an array or a pointer. Given the declarations above, when the compiler sees the expression a[3], it emits code to start at the location "a," move three past it, and fetch the character there. When it sees the expression p[3], it emits code to start at the location "p," fetch the pointer value there, add three to the pointer, and finally fetch the character pointed to. In the example above, both a[3] and p[3] happen to be the character 'l', but the compiler gets there differently.

您可以使用搜索有吨在互联网届的主题解释。

You can use search there are tons of explanations on the subject in th internet.

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