function prototype

[Art Cummings]

Please don't top-post. Your replies belong following or interspersed
with properly trimmed quotes. See the majority of other posts in the
newsgroup, or the newsgroup FAQ.




Also, see this:

<http://www.caliburn.nl/topposting.html>




Brian

Gotcha, I think this is what you mean. Trust me Brian, i'm not trying to be
rude, just trying to learn the correct etiquete and to follow.

Thanks

Art

 

[James Kanze]

I'm trying to write a function prototype that includes an
array of structures. I'm not sure how to write it. I'm also
not sure what the call to a function that uses this prototype
would look like. From what i've read on the web, it needs to
be a pointer to an array. I'm not sure even where to begin.

void

I've written function protoypes for arrays and 2d arrays but
when I write it for the structure, i get compiler errors.

C++ doesn't have 2D arrays. It emulates them with arrays of
arrays. So you can use something like:

void
f( std::vector< std::vector< SomeStruct > >& arg ) ...

Most of the time, however, for a 2D array, I'd write my own
class, probably using a 1D array (std::vector< T >), and
calculating the linear index.

 

[James Kanze]

Thanks Brian, we haven't dealt with vectors yet.

In which case, you certainly shouldn't have dealt with C style
arrays. About the only time you use C style arrays in C++ is
when you need a POD, or for interfacing with legacy or C code.
All of which qualify as special cases, to be aborded once you're
fully at home with the basics of the language (including
std::vector).

std::vector, of course, should be introduced about the same time
you learn loop constructs.

 

[James Kanze]

Thanks Lr, thanks everyone. I'm still not getting how to do this. [..]
void getInfo(Student[],int);
void getInfo(Student &s,int x)
{
}

The two declarations have to MATCH.

Actually, they don't, at least not textually. Something like:

void getInfo( Student[], int ) ;

and then

void getInfo( Student*, int ) ;

is perfectly legal.

It's also a very good example of why C style arrays are broken,
and should only be used when you absolutely need to.

 

[Default User]

Gotcha, I think this is what you mean. Trust me Brian, i'm not
trying to be rude, just trying to learn the correct etiquete and to
follow.

Ok, good. This has some helpful tips:

<http://www.parashift.com/c++-faq-lite/how-to-post.html>






Brian