Debug 2!

[Klashe]

Hey all, this isn't really a debug question, but it's in the same vein.

You know 'em, you love 'em. They are pointers. See if you can answer these simple questions about 'em:

Based on the following declarations:
int i=3;
int j=5;
int *p = &i;
int *q = &j;

determine the values for each of the following expressions. Consider each expression independent.

A) p==&i

B) * (* (& p ))

C) ((7 * (* p)) / (* q)) + 7

D) ((7 * (* p)))/*q+7

One answer per person please!

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If I rest, then I rust.
--Indian Proverb

[drob8]

I hate pointers...besides, shouldn't you be working?

Originally posted by Klashe:
Hey all, this isn't really a debug question, but it's in the same vein.

You know 'em, you love 'em. They are pointers. See if you can answer these simple questions about 'em:

Based on the following declarations:
int i=3;
int j=5;
int *p = &i;
int *q = &j;

determine the values for each of the following expressions. Consider each expression independent.

A) p==&i

B) * (* (& p ))

C) ((7 * (* p)) / (* q)) + 7

D) ((7 * (* p)))/*q+7

One answer per person please!

[Grizzly]

Alright, Im not entirely confident about these but here's my shot:

A) p==&i
---------answer: value in P is the "address" (memory location) of i. THe exact value could be anything.

B) * (* (& p ))
--------answer: 3

C) ((7 * (* p)) / (* q)) + 7
--------answer: 11

D) ((7 * (* p)))/*q+7
--------answer: 1


Am I wrong? Am I wrong? Am I wrong? http://www.sharkyforums.com/ubb/tongue.gif

[Klashe]

Originally posted by Grizzly:
Alright, Im not entirely confident about these but here's my shot:

A) p==&i
---------answer: value in P is the "address" (memory location) of i. THe exact value could be anything.

Am I wrong? Am I wrong? Am I wrong? http://www.sharkyforums.com/ubb/tongue.gif

I'll just answer A for you. We'll let other people answer the other three.

Yes, you are wrong. You are not reading the question correctly. I knew this would throw some people off. http://www.sharkyforums.com/ubb/smile.gif Maybe I should rewrite it:

p == &i

------------------
If I rest, then I rust.
--Indian Proverb

[Grizzly]

Originally posted by Klashe:
I'll just answer A for you. We'll let other people answer the other three.

Yes, you are wrong. You are not reading the question correctly. I knew this would throw some people off. http://www.sharkyforums.com/ubb/smile.gif Maybe I should rewrite it:

p == &i




Ooooh my fault! That was a test for equality, not an assignment operator. Answer is '1', or 'true'.

[Klashe]

Originally posted by Grizzly:

Ooooh my fault! That was a test for equality, not an assignment operator. Answer is '1', or 'true'.




There you go!


------------------
If I rest, then I rust.
--Indian Proverb

[Grizzly]

Originally posted by Klashe:

There you go!




Was I correct on the rest of the answers?

[Klashe]

Originally posted by Grizzly:
Was I correct on the rest of the answers?



Well, since no one else in answering, I'll give you the rest of the answers.

B) correct. when a & and a * are coupled together they are complimentary so they cancel each other out. so essiantially the question is *p which just accesses the value of &i which is 3.
C) correct

D)incorrect. kind of a trick question. Look at it carefully. (Hint: pay attention to the spaces! http://www.sharkyforums.com/ubb/wink.gif )

------------------
If I rest, then I rust.
--Indian Proverb

[Grizzly]

Originally posted by Klashe:
Well, since no one else in answering, I'll give you the rest of the answers.

B) correct. when a & and a * are coupled together they are complimentary so they cancel each other out. so essiantially the question is *p which just accesses the value of &i which is 3.
C) correct

D)incorrect. kind of a trick question. Look at it carefully. (Hint: pay attention to the spaces! http://www.sharkyforums.com/ubb/wink.gif )



Ooooh, actually isn't the answer to C & D the same? 11 ?

[Sol]

ugh, reminds me of school. I try to stay away from those types of things. http://www.sharkyforums.com/ubb/wink.gif I havent seen that since my first few CS classes.

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"You know, I have one simple request, and that is to have sharks with frickin laser beams attached to their heads. Is that too much to ask?"

[Klashe]

Originally posted by Grizzly:
Ooooh, actually isn't the answer to C & D the same? 11 ?



Nope, look at it closer. What does /* represent in C?

------------------
If I rest, then I rust.
--Indian Proverb

[Klashe]

Originally posted by Sol:
ugh, reminds me of school. I try to stay away from those types of things. http://www.sharkyforums.com/ubb/wink.gif I havent seen that since my first few CS classes.



Yeah, I know. But we got to get some kind of programming questions out in this forum! http://www.sharkyforums.com/ubb/smile.gif

------------------
If I rest, then I rust.
--Indian Proverb

[Grizzly]

Originally posted by Klashe:
Nope, look at it closer. What does /* represent in C?




OH GOD!!! I can't believe I missed that one!! hahahahah, that's a *damn* good one Klashe! Friggin comments!

[This message has been edited by Grizzly (edited January 17, 2001).]