CSV reading (help pls)

Is there a way to find out how long a line is in my csv file (e.g. how many variables). I'm reading the data into a string and then using stringstream (a method a picked up from this excellent forum!) to input into an array:

Code:

---

std::ifstream ifs(filename);
std::string line, field;

double* pArray  = new double[11];

std::getline(ifs,line);
std::stringstream ss(line);

for(int i=0; i<11; i++)
{
        ss>>pArray[i];
        std::getline(ss,field,',');
}

---

Also, is this method accurate, as when I'm debugging and stepping through I see values change ever so slightly from what they are in the CSV file.

e.g.

0.4 in a CSV would be 0.4000000002

[bump] Could really do with any help on this [/bump]

use a std::vector instead ... see below for sample:

Code:

---

#include <string>
#include <sstream>
#include <iostream>
#include <vector>

int main()
{
//  std::ifstream ifs(filename);
    std::string line, field;

    std::vector<double> pArray;

    double value;

//  std::getline(ifs,line);
    line = "1.2 , 2.033, 3.03 , 4.03";
    std::stringstream ss(line);

    while (ss >> value)
    {
        pArray.push_back(value);
        std::getline(ss,field,',');
    }

    for (int i=0; i<pArray.size(); ++i)
    {
        std::cout << pArray[i] << "\n";
    }

    return 0;
}

---

Quote:

---

Originally Posted by sheepdonkey

0.4 in a CSV would be 0.4000000002

---

floating point values are not infinitely accurate.
They can't represent exactly decimal numbers.
There is not much you can do (except using greater floating point types):

Quote:

---

Originally Posted by sheepdonkey

double* pArray = new double[11];

---

Why do you dynamically allocate that.
A simple C-style array, or a std::vector (it it may be dynamic) would do the work, without memory leak.

Quote:

---

Originally Posted by sheepdonkey

std::getline(ss,field,',');

---

You'd rather use istream::ignore.

Thanks for the suggestions, they are just what I was looking for.