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From: Daniel on 21 Nov 2007 09:45
I tried to write a parser that reads a file of comma seperated
numbers, but the code was buggy messy and a mix of C and C++ (using
stof and c_str functions.) It is not known in advance how many
numbers there are in each line, but this is needed to set the size of
the vector. Does anyone have a nice block of code to do this in C++ ?

Thanks.
From: Chris ( Val ) on 21 Nov 2007 10:41
On Nov 22, 1:45 am, Daniel <danwgr...(a)gmail.com> wrote:
> I tried to write a parser that reads a file of comma seperated
> numbers, but the code was buggy messy and a mix of C and C++ (using
> stof and c_str functions.)

Do you have an example of what you wrote?

> It is not known in advance how many numbers there are in each line,
> but this is needed to set the size of the vector.

No, it's not.

That's the reason we would use a vector over a
plane jane array.

> Does anyone have a nice block of code to do this in C++ ?

You haven't explained how you want to store the numbers in
a std::vector.

Do you want to store the numbers from each line in the file
in a single dimensioned vector? or do you want the vector
to act as a jagged array, storing each line separately?

Either way is quite easy, it just determines whether you'll
need to use an additional loop and a std::istringstream object
with a "std::vectoe<std::vector<int> >" for example.

--
Chris
From: Chris ( Val ) on 21 Nov 2007 10:43
On Nov 22, 2:41 am, "Chris ( Val )" <chris...(a)gmail.com> wrote:
> On Nov 22, 1:45 am, Daniel <danwgr...(a)gmail.com> wrote:
>
> > I tried to write a parser that reads a file of comma seperated
> > numbers, but the code was buggy messy and a mix of C and C++ (using
> > stof and c_str functions.)
>
> Do you have an example of what you wrote?
>
> > It is not known in advance how many numbers there are in each line,
> > but this is needed to set the size of the vector.
>
> No, it's not.
>
> That's the reason we would use a vector over a
> plane jane array.

Of course, that should have been "plain" :-)

--
Chris
From: Antoon on 21 Nov 2007 10:52

"Daniel" <danwgrace(a)gmail.com> schreef in bericht
news:50a4be23-afd9-423f-8475-283e47d73c42(a)y43g2000hsy.googlegroups.com...
> I tried to write a parser that reads a file of comma seperated
> numbers, but the code was buggy messy and a mix of C and C++ (using
> stof and c_str functions.) It is not known in advance how many
> numbers there are in each line, but this is needed to set the size of
> the vector. Does anyone have a nice block of code to do this in C++ ?
>
> Thanks.

Not realy code but:

- use std::getline to extract std::strings from your file
- create an std::istringstream from the string
- use the extraction operator to extract all integers from the stream
- use std::vector<int>::push_back to insert each integer in your vector


Antoon


From: Jim Langston on 21 Nov 2007 21:32
"Daniel" <danwgrace(a)gmail.com> wrote in message
news:50a4be23-afd9-423f-8475-283e47d73c42(a)y43g2000hsy.googlegroups.com...
>I tried to write a parser that reads a file of comma seperated
> numbers, but the code was buggy messy and a mix of C and C++ (using
> stof and c_str functions.) It is not known in advance how many
> numbers there are in each line, but this is needed to set the size of
> the vector. Does anyone have a nice block of code to do this in C++ ?

It's easier to just google for "CSV Parse C++" and download a class.


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