StackOverflow2013

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plurals

PO
primarykey
Id
19471822
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-10-19T22:23:27.037
FavoriteCount
0
LastActivityDate
2013-10-19T22:36:10.293
LastEditDate
2013-10-19T22:36:10.293
LastEditorUserId
417934
OwnerUserId
417934
ParentId
19471465
PostTypeId
2
Score
0
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0
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text
Body
First of all, let's make your types match up. <code>foo()</code>'s type signature says it returns a <code>node</code>, but you are actually trying to return a pointer to <code>node</code>. Let's redefined <code>foo()</code> to be <pre><code>node *foo() { return headPtr; } </code></pre> <blockquote> Will returning it return the address of what the pointer is pointing to or the pointer itself? </blockquote> The line <pre><code>tmpPtr = foo(); </code></pre> will place into the variable <code>tmpPtr</code> the address of what the pointer is pointing to, and <code>tmpPtr</code> will be another variable that exactly matches <code>headPtr</code>. That is to say, two separate pointers that point to the same thing. There are two separate points to make here: <ul> <li><code>tmpPtr</code> and <code>headPtr</code> are two separate variables, and if you re-assign one it will have no effect on the other.</li> <li>Since they currently point to the same node, you could potentially mutate the node that they point to by dereferencing either pointer, assuming they point to an actual node and not <code>NULL</code>.</li> </ul> If your intent is to change what <code>headPtr</code> points to you can either: <ul> <li>change <code>headPtr</code> directly with an assignment like <code>headPtr = something</code>.</li> <li>set up a pointer to <code>headPtr</code> with type <code>node**</code>.</li> </ul> You can set up a pointer to <code>headPtr</code> with something like <pre><code>node **foo() { return &headPtr; } int main() { node **headPtrPtr = foo(); *headPtrPtr = something else; } </code></pre> This will place into <code>headPtrPtr</code> a pointer to <code>headPtr</code>. By dereferencing <code>headPtrPtr</code>, you can make <code>headPtr</code> point to a new node.
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1. This table or related slice is empty.
PostParentId
1. POreturning a pointer and modifying what that pointer points to
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USChris Rice
UserOwnerUserId
1. USChris Rice
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