How would I read a file into an multidimensional array or three seperate arrays based on a sequence of delimiters?

[JustSumMe]

New to c++ and programming, and I am having trouble figuring this out.

Pseudo idea; Assuming I can define the delimiters

 ',' ',' '\n' 

then read file line by line while adding each element to each array.

#define ARRAY_SIZE 1000 

string someString[ARRAY_SIZE];
double someDoubble[ARRAY_SIZE];
double someDoubble[ARRAY_SIZE]; 

Then the text file that I am reading is

somestring, someDouble, someDouble\n

Or in other words the delimiters are comma, comma, newline char.

[Cubbi]

Without redefining delimiters, you would have to use getline() to read that first string up until the comma:

#include <iostream>
#include <fstream>
#include <string>
#include <vector>

int main()
{
    std::vector<std::string> someString;
    std::vector<double> someDouble;
    std::vector<double> someOtherDouble;

    std::ifstream file("test.txt");
    std::string s;
    double d1, d2;
    char ch;
    while(    file >> std::ws // skip leading whitespace
           && getline(file, s, ',') // read until comma into string s
           && file >> d1 >> ch >> d2
           && ch == ',' ) // make sure it was a comma
    {
        someString.push_back(s);
        someDouble.push_back(d1);
        someOtherDouble.push_back(d2);
        std::cout << "saving " << s << " : " << d1 << " : " << d2 << '\n';
    }
}

or you could make the parsing a bit easier by defining comma as whitespace.. you may not want to do that if you're "new to C++ and programming", but do keep in mind that it's available

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <locale>

struct comma_space : std::ctype<char> {
    static const mask* make_table() {
        static std::vector<mask> v(classic_table(), classic_table() + table_size);
        v[','] |=  space;  // comma will be classified as whitespace
        return &v[0];
    }
    comma_space(std::size_t refs = 0) : ctype(make_table(), false, refs) {}
};


int main()
{
    std::vector<std::string> someString;
    std::vector<double> someDouble;
    std::vector<double> someOtherDouble;

    std::ifstream file("test.txt");
    file.imbue(std::locale(file.getloc(), new comma_space));
    std::string s;
    double d1, d2;
    while( file >> s >> d1 >> d2 )
    {
        someString.push_back(s);
        someDouble.push_back(d1);
        someOtherDouble.push_back(d2);
        std::cout << "saving " << s << " : " << d1 << " : " << d2 << '\n';
    }
}