有关于这两者的区别,下面的来自Stack Overflow的解释非常清晰:
http://stackoverflow.com/questions/1704407/what-is-the-difference-between-char-s-and-char-s-in-c
The difference here is that
char *s = "Hello world";
will place Hello world in the read-only parts of the memory and making s a pointer to that, making any writing operation on this memory illegal. While doing:
char s[] = "Hello world";
puts the literal string in read-only memory and copies the string to newly allocated memory on the stack. Thus makings[0] = 'J'
legal.
总结一下,要点如下:
char []
定义的是字符串数组,该字符数组在内存中的存储是先分配新空间,再去填充,因此该数组的内容可以改变,即通过s[0] = 'J'
是合法的。char *s
定义的是字符串指针变量,该指针变量指向一个字符串,该指针的值是该字符串在内存中的地址。对于这个指针变量来说,改变它的值=改变地址=改变指针指向,比如从指向第一个字符变为指向第二个字符。然后改字符指针变量并没有权力去更改它指向的字符的值,比如*(s+1) = 'J'
。换句话说,就是可以修改指针的值,但不能修改指针指向的值。