C/C++中字符串存储位置

Posted 2020-07-11 hu983

代码：

 1 #include <iostream>
 2 #include <cstdio>
 3 
 4 using namespace std;
 5 
 6 void fun(char **p){
 7     //char* s = "world";
 8     char s[] = "world";
 9     printf("point s = %p\n",s);
10     *p = s;
11     printf("point p = %p\n",*p);
12 }
13 
14 int main(){
15 
16     char *p = "hello";
17     printf("point p = %p\n",p);
18     cout<<"func start"<<endl;
19     fun(&p);
20     cout<<"func end"<<endl;
21     printf("point p = %p\n",p);
22     cout<<p<<endl;
23 
24     return 0;
25 }

输出：

point p = 0x400acc
func start
point s = 0x7ffe10660100
point p = 0x7ffe10660100
func end
point p = 0x7ffe10660100
`

 若将代码第8行注释并替换成第7行注释内容，输出为

point p = 0x400ac2
func start
point s = 0x400aa0
point p = 0x400aa0
func end
point p = 0x400aa0
world

 分析：

常量字符串存储在文字常量区，而字符数组存储在栈上。