Well, you'd have to say atof(stropenprice[x].c_str()), because atof() only operates on C-style strings, not std::string objects, but that's not enough. You still have to tokenize the line into comma-separated pieces. find() and substr() may be a good start (e.g. see here), though perhaps a more general tokenization function would be more elegant.
Here's a tokenizer function that I stole from somewhere so long ago I can't remember, so apologies for the plagiarism:
std::vector<std::string> tokenize(const std::string & str, const std::string & delimiters)
{
std::vector<std::string> tokens;
// Skip delimiters at beginning.
std::string::size_type lastPos = str.find_first_not_of(delimiters, 0);
// Find first "non-delimiter".
std::string::size_type pos = str.find_first_of(delimiters, lastPos);
while (std::string::npos != pos || std::string::npos != lastPos)
{
// Found a token, add it to the vector.
tokens.push_back(str.substr(lastPos, pos - lastPos));
// Skip delimiters. Note the "not_of"
lastPos = str.find_first_not_of(delimiters, pos);
// Find next "non-delimiter"
pos = str.find_first_of(delimiters, lastPos);
}
return tokens;
}
Usage: std::vector<std::string> v = tokenize(line, ","); Now use std::atof() (or std::strtod()) on each string in the vector.
Here's a suggestion, just to give you some idea how one typically writes such code in C++:
#include <string>
#include <fstream>
#include <vector>
#include <cstdlib>
// ...
std::vector<double> v;
std::ifstream infile("thefile.txt");
std::string line;
while (std::getline(infile, line))
{
v.push_back(std::strtod(line.c_str(), NULL)); // or std::atof(line.c_str())
}
// we ended up reading v.size() lines
