btn char *和char []有什么区别 [英] What's the difference btn char * and char[]

问题描述

char * a和char a [20]有什么区别?
请给我看一个简单的例子进行解释.不要太复杂.

What is the difference between char *a and char a[20]?
Please show me a simple example for an explanation. Don''t make it too complex.

Thanks in advance!

推荐答案

char* a声明一个指向char的指针.您可以随时重新分配a:

char* a declares a pointer to a char. You can re-assign a anytime:

char* a = "a string";
a = "another string";

char a[20]声明一个固定大小数组.您不能更改a的值，但是可以修改数组的内容:

char a[20] declares a fixed size array. You can''t change the value of a, but you can chande the content of the array:

char a[20] = "a string";
//this will not compile
a = "another string";
//but this will
strcpy(a, "another string");
//be carefull though not to copy more than 20 characters
//or you will have a buffer overflow

如果您有兴趣，可以在这里进行更深入的讨论->
声明char Str [16]时， Str是指针吗? [

If you''re interested, there is a more in-depth discussion here ->
When declare char Str[16] then Str is a pointer?[^]

char * a只是一个指向字符的指针，除了引用变量的空间之外，还有没有足够的空间来存储任何东西.
char b [20]保留用于易于使用的20个字符的空间.

该页面有很好的描述: http://c-faq.com/aryptr/index.html [ ^ ]

干杯，

char *a is only a pointer to a character and besides the space for the reference variable there is no space alotted for storing anything.
char b[20] reserves space for 20 characters that can be readily used.

This page has an good description: http://c-faq.com/aryptr/index.html[^]

Cheers,

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