Pointer/Variable

Code:

int *x, y;
x = y;

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:

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

...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:

int* x;
int* y;

This should make it clear.

Code:

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

---

int *x, *y;
x = y;

---

int x, y;
x = y;

---

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

Thank you, it's clear now.