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plurals

PO
primarykey
Id
16508336
data
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2013-05-12T14:22:25.660
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2013-05-12T14:54:24.593
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2013-05-12T14:54:24.593
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179910
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179910
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16508288
PostTypeId
2
Score
6
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LastEditorDisplayName
text
Body
<code>z</code> is a pointer to a pointer (which will typically point to a dynamically allocated array of pointers). <code>y</code> is a pointer to <code>int</code>. Again, more often than not it'll point to a dynamically allocated array of <code>int</code>s. So, the <code>*z = &x;</code> is setting the pointer that <code>z</code> refers to to point at <code>x</code>. I.e., <code>z</code> points at a pointer, which (in turn) points to <code>x</code>. <code>*y = x;</code> is taking the value of <code>x</code> and assigning it to the <code>int</code> pointed to by <code>y</code>. For things like this, a picture is often helpful. So, our basic definitions give us this: <img src="https://i.stack.imgur.com/yIJ4J.png" alt="enter image description here"> The we do: <pre><code>z = (int **) malloc (sizeof(int *)); y = (int *) malloc (sizeof(int)); </code></pre> Which gives us this: <img src="https://i.stack.imgur.com/rdqD5.png" alt="enter image description here"> Then we do: <pre><code>*z = &x; *y = x; </code></pre> Which gives us this: <img src="https://i.stack.imgur.com/b0X5n.png" alt="enter image description here"> In all of these, a dashed line signifies a pointer from one place to another, while the solid line indicates copying a value from one place to another. We can then consider the long-term differences between them. For example, consider what happens if we add <code>x=2;</code> after all the assignments above. In this case, <code>*y</code> will still equal <code>1</code>, because we copied the value <code>1</code> from <code>x</code> to <code>*y</code>. <code>**z</code> will equal <code>2</code> though, because it's just a pointer to <code>x</code> -- any change in <code>x</code> will be reflected in <code>**z</code>.
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1. This table or related slice is empty.
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1. POPointers and Memory Allocation in C
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1. PTAnswer
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1. USJerry Coffin
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1. USJerry Coffin
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1. POPointers and Memory Allocation in C
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