How to pass a file into a vector and into a private constructor

[mcclit]

How to pass a file into a vector and into a private constructor, also how to display the elements of the vector if user chose to "show"

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <sstream>
#include <cstdlib>
using namespace std;

class expense
{
private:
	double c_price;
	string c_discription;
public:
	expense(double price, string discription)
	{
		price = c_price;
		discription = c_discription;
		if (price <= 0.0)
		{
			c_price = 0.0;
		}
	}
	string toString()
	{
		stringstream sout;
		sout << "price $(" << c_price << ") discription(" << c_discription << ")";
		return sout.str();
	}
};

bool argcCheck(int argc)
{
	if (argc == 2)
		return true;
	else
		return false;
}

void menu()
{
	cout << "spend\nshow\namount >=\nsave file\nhelp\nexit" << endl;
}


int main(int argc, char*argv[])
{
	fstream fin;
	fin.open("expenses2.txt", ios::out);
	if (!fin) 
	{
		cerr << "Error in opening the file" << endl;
		return 1;
	}
	vector<expense> expenses;
	expense temp;
	while (fin >> temp.price >> temp.discription) 
	{
	expenses.push_back(temp);
	}

	string command;
	cout << "spend\nshow\namount >=\nsave file\nhelp\nexit" << endl;
	cin >> command;

	if (command =="show")
	{
		
	}
	else if (command == "help")
	{
		menu();
	}
	else if (command == "spend")
	{

	}
	cout << argc << "  " << boolalpha << argcCheck(argc) << endl;
	if (argcCheck(argc) == false)
	{
		cout << "invalid command, please try again" << endl;
	}

	return 0;
}

[keskiverto]

You already seem to "pass a file into a vector" in this:

vector<expense> expenses;
expense temp;
while (fin >> temp.price >> temp.discription) 
{
  expenses.push_back(temp);
}

Perhaps you could explain the question?


What "private constructor"? Where?
(I think I guess what you mean, but learning to ask a question is a good goal too.)

[mcclit]

sorry about vague question I had. The first question is how to pass a file into a vector that also store the information in the "private" section of the class expense.

class expense
{
private:
	double c_price;
	string c_discription;
public:
	expense(double price, string discription)
	{
		price = c_price;
		discription = c_discription;
		if (price <= 0.0)
		{
			c_price = 0.0;
		}
	}
	string toString()
	{
		stringstream sout;
		sout << "price $(" << c_price << ") discription(" << c_discription << ")";
		return sout.str();
	}
};

The second question is how to display the values that I stored inside the vector when the user prompts it?

string command;
	cout << "spend\nshow\namount >=\nsave file\nhelp\nexit" << endl;
	cin >> command;

	if (command =="show")
	{
		
	}

Sorry for the inconvenience that I gave earlier.

[coder777]

The first question is how to pass a file into a vector that also store the information in the "private" section of the class expense.

Line 55: You use the same name for the vector obeject and the class. Change line 55 e.g. like so:
vector<expense> expenses_vector;

The second question is how to display the values that I stored inside the vector when the user prompts it?

E.g.:

for(expense &e : expenses_vector)
{
  std::cout << e.toString() << '\n';
}