Question about pointers

[JS]

I have the following:

int x = 2;

int *ip;

ip = &x;


now as I understand *ip equals 2.


Is it possible to say that *ip equals a value and & is the adress for that
value?

JS

 

[Ioannis Vranos]

I have the following:

int x = 2;

int *ip;

ip = &x;


now as I understand *ip equals 2.


Is it possible to say that *ip equals a value and & is the adress for that
value?

ip is a variable that stores the memory address of variable x.

When you dereference ip like this: *ip, you access x.

 

[Victor Bazarov]

I have the following:

int x = 2;

int *ip;

ip = &x;


now as I understand *ip equals 2.


Is it possible to say that *ip equals a value and & is the adress for that
value?

'&' is an operator. It is not an address of anything. Was it a typo?

Anyway... *ip designates an object. The original name of that object is
'x'. The value of 'x' and, consequently, of *ip, is 2, since they both
designate the same object.

V

 

[JS]

ip is a variable that stores the memory address of variable x.

When you dereference ip like this: *ip, you access x.

ok so the value of x and *ip is both 2 if int x = 2 right?

 

[Ioannis Vranos]

ok so the value of x and *ip is both 2 if int x = 2 right?

Right.

 

[codigo]

ok so the value of x and *ip is both 2 if int x = 2 right?
A clear distinction needs to be made here. The two variables are one and the
same entity. It matters not which is modified or initialized. The correct
statement would be that *ip is x, regardless of what value it happens to
hold.

 

[Ioannis Vranos]

A clear distinction needs to be made here. The two variables are one and the
same entity. It matters not which is modified or initialized. The correct
statement would be that *ip is x, regardless of what value it happens to
hold.

ip and x are *two* different objects with a separate memory address each
one. ip is an int pointer variable, that is, it stores memory addresses
of int variables, while x is an int variable.

 

[evaned]

Yes, but *ip -- the location ip points to -- is indistinguishable from
x, at least as far as I can tell.

 

[Ioannis Vranos]

Yes, but *ip -- the location ip points to -- is indistinguishable from
x, at least as far as I can tell.

ip dereferenced, accesses x. We use very accurate terminology in clc++.

 

[Howard]

Yes, but *ip -- the location ip points to -- is indistinguishable from
x, at least as far as I can tell.

That is, so long as ip isn't changed to point elsewhere!

-Howard