suppose this code: <pre class="prettyprint"><code>main() { int *x; *x = 3; printf("%d %d %d\n", *x, &x, x); // output 3 5448392 2293524 } </code></pre> if <code>*x</code> is the value; <code>&x</code> the addres; what does mean that value of <code>x</code>?

<ul> <li> <code>*x</code> is the value (correct)</li> <li> <code>x</code> is the address of the value. EDIT In your case, this address is uninitialized, so it is not pointing anywhere in particular (thanks Keith Nicholas for mentioning this).</li> <li> <code>&x</code> is the address of the [pointer that should contain the] address of the value.</li> </ul> (it's worth pointing out that your program may crash :)

Pointer value of *x &x and x

Tags:

c

pointers

suppose this code:

main()
{
    int *x;
    *x = 3;

    printf("%d %d %d\n", *x, &x, x);
    // output 3 5448392 2293524
}

if *x is the value; &x the addres; what does mean that value of x?

510

asked Nov 28 '22 09:11

Fabricio

1 Answers

*x is the value (correct)
x is the address of the value. EDIT In your case, this address is uninitialized, so it is not pointing anywhere in particular (thanks Keith Nicholas for mentioning this).
&x is the address of the [pointer that should contain the] address of the value.

(it's worth pointing out that your program may crash :)