释放链表 C 中的节点 [关闭]

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I wonder why I cannot free node b and c

Also, I have repeatedly freed b after the while loop and lines after while loop do not work as well.

What is the problem here?

Answer 1

The allocated memory is actually being freed. However the variable still contains the memory address. Accessing that address after the memory has been freed is undefined behavior. In this case it's showing you what was there, however it could just as easily cause a crash. Later when you free(b) you are definitely corrupting your heap because that memory has already been freed in your while loop.