text file contents to array - c++

Question

I have a text file-> info.txt which contains the follow Id,games,amount
info.txt
1,left4dead,50
2,warcraft3,60
I know how to extract the details using vectors with my codes shown below.
stock.h
#ifndef stock_stock_h
#define stock_stock_h
#include <iostream>
class stock {
public:
stock() {
columnOneText = " ";
columnTwoText = " ";
}
stock(std::string columnOneText,
std::string columnTwoText
);
std::string getColumnOne();
std::string getColumnTwo();
void setItemId(std::string columnOneText);
void setItemDescription(std::string columnTwoText);
private:
std::string columnOneText, columnTwoText;
};
#endif
main.cpp
#include "stock.h"
#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <vector>
using namespace std;
stock::stock(string columnOneText,
string columnTwoText)
{
setItemId(columnOneText);
setItemDescription(columnTwoText);
};
string stock::getColumnOne() {
return columnOneText;
}
string stock::getColumnTwo() {
return columnTwoText;
}
void stock::setItemId(string columnOneText) {
this->columnOneText = columnOneText;
}
void stock::setItemDescription(std::string columnTwoText) {
this->columnTwoText = columnTwoText;
}
int main(){
vector<stock> itemDetails;
string line;
string columnOneText;
string columnTwoText;
ifstream readFile("info.txt");
while(getline(readFile,line)) {
stringstream iss(line);
getline(iss, columnOneText,',');
getline(iss, columnTwoText, ',');
//consturctor
stock splitedColumns(columnOneText,
columnTwoText
);
itemDetails.push_back(splitedColumns);
}
readFile.close();
cout << "this is column One in text file" << endl;
for (int i =0; i<itemDetails.size(); i++) {
cout << itemDetails[i].getColumnOne() << " " << endl;
}
cout << "this is column Two in text file" << endl;
for (int i =0; i<itemDetails.size(); i++) {
cout << itemDetails[i].getColumnTwo() << " " << endl;
}
}
what I don't really know is how to extract the details using arrays instead of using vectors.
I have tried this but it doesn't seem to work
string line;
string columnOneText;
string columnTwoText;
string columnOneTextArray[7];
while(getline(readFile,line)) {
stringstream iss(line);
getline(iss, columnOneText,',');
getline(iss, columnTwoText, ',');
for(int i=0; i<8; i++) {
columnOneTextArray[i] = columnOneText;
cout << columnOneTextArray[i];
}
}
You guys might ask why do I want to do it in arrays instead of using vector,
I just curious and exploring how it can be done using arrays.

Answer 1

You problem can be solved in a lot simpler manner by using struct definitions in addition to using vectors (your use of classes is a bit of overkill, IMHO):
#include <fstream>
#include <iostream>
#include <cstdlib>
#include <vector>
#include <sstream>
//this utilizes a more idiomatic naming convention as opposed to `columnX`
typedef struct Stock {
int id;
std::string games;
int amount;
} Stock;
//Syntactic sugar for easier output
std::ostream& operator << (std::ostream& in, const Stock& stock) {
in << stock.id << " " << stock.games << " " << stock.amount;
return in;
}
int main() {
std::string filename = "info.txt";
std::fstream ifile;
std::vector <Stock> inventory;
Stock stock_t;//a temporary Stock variable
std::string temp;
ifile.open(filename.c_str(), std::ios::in);
if (!ifile.is_open()) {
std::cerr << "There was a problem opening the input file: \"" << filename << "\"\n";
exit(1);
}
while (ifile >> temp) {
std::istringstream iss(temp);
int column = 0;
//break each constituent line by using the comment as a delimiter:
while(std::getline(iss, temp, ',')) {
if (column == 0) {
stock_t.id = std::atoi(temp.c_str());
}
else if (column == 1) {
stock_t.games = temp;
}
else if (column == 2) {
stock_t.amount = std::atoi(temp.c_str());
}
++column;
}
inventory.push_back(stock_t);
}
for (int i = 0; i < inventory.size(); ++i) {
std::cout << inventory[i] << "\n";
}
ifile.close();
return 0;
}
Which outputs:
1 left4dead 50
2 warcraft3 60