Help - C++ Assignment Question

Arillis · Post by **Arillis** » 12 Jul 2007, 15:21

Hi

Please can someone assist me with the ffg. Its a question out of my assignment

Rewrite the following piece of code, correcting all the problems found:

void CalculateValues (const in&a, float *b, int &c)
{
d = 2.04;
if (*a = 0)
*a += 1;
c = a + d;
else
b = c / d;
c = a - b + d;
}

HINT: If a=4, b=0.0 and c=5 when this function is called, their values when this function returns should be: a=4, b=0.25, and c=24.15 (6marks)

rustypup · Post by **rustypup** » 12 Jul 2007, 15:25

please design my nuclear clock?

the answer is 42... do your work! - bad form, than person...

can you point out what you think the errors may be?

Arillis · Post by **Arillis** » 12 Jul 2007, 15:34

Nope, please Im really struggling, I havent done any programming before. I can manage the theory part of C++ programming but I just cant get the practical part.

Ps. There was a typo:

Void CalculateValues (const in &a, float *b, int &c)

Slasher · Post by **Slasher** » 12 Jul 2007, 15:39

Some time or another you will have to learn...

BTW - What year you finished school in Newcastle? Which school were you in? I matriculated in 2003... Maybe we know each other...

Hman · Post by **Hman** » 12 Jul 2007, 15:41

Code: Select all

HAI
CAN HAS STDIO?
D = 2.04;
IZ :(*A = 0:)
*A += 1;
C = A + D;p
NOWAI 
B = C / D;p
C = A - B + D;p
KTHNXBAI

Arillis · Post by **Arillis** » 12 Jul 2007, 15:45

Ok, ill just go pull some more of my hair out and get back to you...

Slasher · Post by **Slasher** » 12 Jul 2007, 15:48

Start with the fact that d is never defined...

I dont know C++ , cant help you...

Did you read part 2 of my post?

Hman · Post by **Hman** » 12 Jul 2007, 15:48

Sorry man, I only know LOLCODE. And BASIC, I'm gonna start C++ sometime.

rustypup · Post by **rustypup** » 12 Jul 2007, 16:05

the errors are glaring for anyone who can manage the 'theory' part...

in c++:
what does '*' and '&' signify?
what happens when you iterate '*'?
how is an if/else evaluated?

really... this is like "intro to programming 101"... simply handing it to you on a plate does you no favours whatsoever... buckle down and do the work.

<for an encore, kicks some puppies into oncomming traffic and smacks ceiling cat with a wiffle bat...>

Hex_Rated · Post by **Hex_Rated** » 12 Jul 2007, 16:11

Research pointers. If you get really desperate, hand in this:

void CalculateValues( int a, float *b, float *c)
{

*b=0.25f;
*c=24.15f;

}

Arillis · Post by **Arillis** » 12 Jul 2007, 16:23

Firstly, I have done zero programming, my course includes, financial management, business management, business communication, elements of programming and then C++ programming. I dont understand why they would put such a course like this together....

Anyway this is what I know so....

the & is the reference operator and can be read as 'address of'
the * is the dereference operator and can be read as 'value pointed by'

im not sure what happens when you iterate '*'

if/else is evaluated by true/false

Arillis · Post by **Arillis** » 12 Jul 2007, 16:32

Thank you Hex rated

Hex_Rated · Post by **Hex_Rated** » 12 Jul 2007, 16:40

My code will work but it's not the solution you're looking for.

Judas · Post by **Judas** » 12 Jul 2007, 17:07

Code: Select all

void CalculateValues (const int &a, float *b, float &c) { // Correctly define c as a float

 float d = 2.04; // Define d before attempting to modify it

 if (a == 0) // Remove derefence (*) operator - a is a reference, not a pointer
                   // And change assignment (=) operator to equality (==) operator
  { // Wrap the block in braces
     ; // Statement was illegal - a can't be incremented because it is defined const
     c = a + d;
  } else {
   *b = c / d; // Dereference b first - otherwise you'll change the pointer
   c = a - (*b) + d; // Dereference b again
  }
}

Rusty is right, you should really learn WHY the code doesn't work - this is pretty basic programming - so if you have any questions, feel free to ask.

NOTE: I've only fixed the syntax errors - you'll still need to modify it to output the correct values.

Hex_Rated · Post by **Hex_Rated** » 12 Jul 2007, 17:17

You've corrected the syntax for him, but there's still a logical error somewhere. It doesn't evaluate to the hint.

Judas · Post by **Judas** » 12 Jul 2007, 17:25

Hex_Rated wrote:You've corrected the syntax for him, but there's still a logical error somewhere. It doesn't evaluate to the hint.

I know. I didn't want to do all the work for him.

Hex_Rated · Post by **Hex_Rated** » 12 Jul 2007, 17:30

Ah, I see. Didn't read your comment.

Arillis · Post by **Arillis** » 13 Jul 2007, 14:24

OK guy's time to come clean. This was a test and you all have passed!!!!
Just kidding. It is actualy a friend of mine here at work that is struggeling with her c++ and I suggested to her to come to you ever so helpfull guy's here at the forums. I let her log on with my profile just to get her online as she had a deadline for her assignment. Now that she saw how helpfull you bunch are she will create her own profile. I can't code to save my live (not enough brains), just an administrator.

Thanks again!!!!!!!!
You can pm her (Milkybar)she's hot

Post by **Anthro** » 13 Jul 2007, 14:25

NOW THAT IS JUST SILLY BUSINESS

but if she's hawt.. so be it/ Jaamiiiin !!!
PM away boyz

Slasher · Post by **Slasher** » 13 Jul 2007, 14:44

You know it is not nice to create a second profile just so you can get your homework assignments done?

That can NOT be at a business level with programming - How does someone get hired with such a lack of skillz?

Sneaky buggger arent you?

Arillis · Post by **Arillis** » 13 Jul 2007, 15:23

Well I don't think she can be that hot cause you need hair on your teeth to do what she is trying. She is in admin and now she is trying to learn programming for part of her course in business management or something. I told her it is not easy, but chicks don't listen.
So here is the proof, women don't know everything..lol

I suppose I sould stop nagging or I will start getting some serious chick mail.....

Milkybar · Post by **Milkybar** » 01 Aug 2007, 09:26

Just letting you guys know, I passed the assignment...

Judas · Post by **Judas** » 01 Aug 2007, 09:59

Milkybar wrote:Just letting you guys know, I passed the assignment...

Congrats! :bigups:

Feel free to ask if there's anything else that we can help with.