Pointer/Variable

Code:

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int *x, y;
x = y;

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Why does that give an error?

That statement declares x as an integer pointer and y as an integer (not a pointer) which are not the same. Perhaps you meant:

Code:

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int *x, *y;
...
x = y;

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...which would declare both x and y as pointers.

[edit]y should actually point to something valid before you do such an assignment.[/edit]

This is also a reason to prefer declaring one pointer per statement:

Code:

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int* x;
int* y;

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This should make it clear.

Code:

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int *x, y; == int *x; int y;
x = &y;

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int *x, *y;
x = y;

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int x, y;
x = y;

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int* x, y; == int *x, y; == int * x, y;

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Thank you, it's clear now. :)