C 指针和数组之间的关系

我非常确定

*（指针+1）=指针[1]

我的问题是，当我运行此代码时：

  if (NULL == (*str_array = (char **)malloc(sizeof(char *)*10))) {
    return ERROR;
}

splitter = strtok(str, TOKEN);


 while(splitter != NULL){

     if (NULL == ((*str_array )[i] =(char *)malloc(sizeof(char)*strlen(str) +1))){
         return ERROR;

     }

     strcpy((*str_array )[i], splitter);


     splitter  = strtok(NULL,TOKEN);
     i++;
 }

我得到一个

valgrind

输出，表明我没有泄漏或错误要抑制。这个程序运行得很好

但是当我用

**（str_数组+i）

替换

（*str_数组）[i]

并运行

valgrind--leak check=full./program

我得到以下输出：

    ==18873== Invalid write of size 8
==18873==    at 0x1089B7: split_func (in /home)
==18873==    by 0x108B4E: main (in /home)
==18873==  Address 0x3100414747504724 is not stack'd, malloc'd or (recently) free'd
==18873== 
==18873== 
==18873== Process terminating with default action of signal 11 (SIGSEGV)
==18873==  General Protection Fault
==18873==    at 0x1089B7: split_func (in /home)
==18873==    by 0x108B4E: main (in /home)
==18873== 
==18873== HEAP SUMMARY:
==18873==     in use at exit: 130 bytes in 3 blocks
==18873==   total heap usage: 4 allocs, 1 frees, 1,154 bytes allocated
==18873== 
==18873== 11 bytes in 1 blocks are definitely lost in loss record 2 of 3
==18873==    at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18873==    by 0x1089B6: split_func (in /home)
==18873==    by 0x108B4E: main (in /home)
==18873== 
==18873== LEAK SUMMARY:
==18873==    definitely lost: 11 bytes in 1 blocks
==18873==    indirectly lost: 0 bytes in 0 blocks
==18873==      possibly lost: 0 bytes in 0 blocks
==18873==    still reachable: 119 bytes in 2 blocks
==18873==         suppressed: 0 bytes in 0 blocks
==18873== Reachable blocks (those to which a pointer was found) are not shown.
==18873== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==18873== 
==18873== For counts of detected and suppressed errors, rerun with: -v
==18873== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)

大家都知道，“str”是一个字符串，要在每个“，”（TOKEN）和“splitter”字符指针中进行拆分。“str_数组”是作为参数接收的字符***指针，它应该是动态字符串的动态数组。 两次运行之间唯一的区别是我在前面提到的代码中所做的一个更改。有人能告诉我这里发生了什么事吗

我非常确定

*（指针+1）

=

指针[1]

对。这两个表达式对于任何数组或指针都是等效的

但是当我用

**（str_数组+i）

替换

（*str_数组）[i]

时

这两个表达式不相等

（*str_数组）[i]

是

*（*str_数组）+i）

---

**（str_数组+i）

是

*str_数组[i]

请重新考虑您的标签。。。你是在编码C还是C++？这是一个重要的区别，

（*str_数组）[i]

等于

*（*str_数组+i）

缺少免费的

。