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copied!<p>My guess is that your test.dat file is not in the working directory. To verify that you can test the stream:</p> <pre><code>if( ! theStream ) std::cerr << "Error opening file test.dat\n"; </code></pre> <p>Check your project properties in XCode to see what the working directory is, and place the file there.</p> <p>If your file contains data that doesn't parse as integers then the streams' <code>int</code> parsing will fail. Make sure the line you read has nothing but integers and whitespace:</p> <pre><code>#include <cctype> // algorithm iterator ... struct not_digit_and_not_whitespace { bool operator()(char c) const { return ! std::isdigit(c) && ! std::isspace(c); } }; // ... line.erase(remove_if( line.begin(), line.end(), not_digit_and_not_whitespace()), line.end() ); </code></pre> <p>Also, you can simplify your code. First, if you include <code><iostream></code> then you don't need <code><istream></code>. Secondly, you can use the range constructor of <code>std::vector</code> to get the integers.</p> <pre><code>#include <algorithm> // iterator fstream iostream vector string sstream int main() { std::string line; std::ifstream theStream("test.dat"); std::getline(theStream, line); line.erase(std::remove(line.begin(), line.end(), '\'' ), line.end()); std::istringstream myStream(line); std::vector<int> numbers((std::istream_iterator<int>(myStream)), std::istream_iterator<int>()); std::copy(numbers.begin(), numbers.end(), std::ostream_iterator<int>(std::cout, "\n")); return 0; } </code></pre>

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