Definition of pointer

[Niels_M]

Hi all

When a variable V is assigned to a pointer P, then is the address contained in P the address of V at the time of assignment, or is it the subsequent address of V?

By subsequent I mean that if the address of V is changed (if V is e.g. a pointer), then does P still contain the old address, or the new address?

[hk_mp5kpdw]

If a pointer is assigned an address (assigned by the value in another pointer) then the 1st pointer holds the address it was assigned at the time of the assignment. If the 2nd pointer's stored address changes, the 1st pointer's stored address will not change.

[MK27]

#include <stdio.h>

int main(void) {
	int x=5, y=10, *xp=&x, *z=xp;

	printf("%d %d\n",*z,*xp);
	xp = &y;
	printf("%d %d\n",*z,*xp);

	return 0;
}

[Niels_M]

Thanks. Good explanation, and good example.