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问题描述
在C语言中,可以在这样的声明中使用字符串文字:
In C, one can use a string literal in a declaration like this:
char s[] = "hello";
或类似这样:
char *s = "hello";
那么有什么区别?我想知道在编译和运行时在存储持续时间方面实际发生了什么。
So what is the difference? I want to know what actually happens in terms of storage duration, both at compile and run time.
推荐答案
此处的区别在于
char *s = "Hello world";
将 Hello world
放置在内存的只读部分,并且使 s
指向该内存的指针将使对该内存的任何写操作都非法。
will place "Hello world"
in the read-only parts of the memory, and making s
a pointer to that makes any writing operation on this memory illegal.
正在这样做:
char s[] = "Hello world";
将文字字符串放入只读内存中,并将该字符串复制到堆栈上新分配的内存中。因此,使
puts the literal string in read-only memory and copies the string to newly allocated memory on the stack. Thus making
s[0] = 'J';
合法。
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