file input

[elimin8tor]

Hi, I want to read some data from a file for example something like this:

3 // number of variables
var1 = 40
var2 = 50
var3 = 70

I only want to read the value of the vars and write them to an array in my program, but I can't find out how to read the data as integers and not as characters

Any hint or sample app as it should be easy for the professional would be nice

[Philip Nicoletti]

you can use standard C++ iostream ....

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

using namespace std;

int main()
{
	vector<int> array;

	ifstream infile("test.txt");	// open input file (it is close automatically)

	if (infile)						// if opened OK
	{
		int i,j,n;

		infile >> n;				// read in number of integers
		if (infile.fail())
		{
			cout << "error reading number of integers" << endl;
			return 1;
		}

		for (i=0; i<n; i++)
		{
			infile >> j;			// read in next integer
			if (infile.fail())
			{
				cout << "error reading integers" << endl;
				cout << "read in successfully " << array.size() << " integers" << endl;
				return 1;
			}
			array.push_back(j);		//   store in the array
		}

		cout << "values read in ... " << endl;
		for (i=0; i<array.size(); ++i)
		{
			cout << array[i] << endl;
		}
	}
	else
	{
		cout << "unable to open input file " << endl;
		return 1;
	}

	return 0;
}

[elimin8tor]

thx