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POHeavy method call blocks cout
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/10554474/why-does-my-cout-output-not-appear-immediately">Why does my cout output not appear immediately?</a> </p> </blockquote> <p>I have a very heavy method (it checks if a number is a prime - Euler 3), which blocks <code>cout</code>.<br> How is this possible? This is my code:</p> <pre><code>int main(int argc, char * argv[]) { cout &lt;&lt; "-----------------------------------------------------------" &lt;&lt; endl; cout &lt;&lt; "isPrime(3): " &lt;&lt; ((isPrime(3)) ? "true" : "false") &lt;&lt; endl; cout &lt;&lt; "isPrime(10): " &lt;&lt; (isPrime(10) ? "true" : "false") &lt;&lt; endl; cout &lt;&lt; "BLAH"; cout &lt;&lt; "BLAH"; cout &lt;&lt; "BLAH"; cout &lt;&lt; "BLAH"; cout &lt;&lt; "BLAH"; cout &lt;&lt; "BLAH"; cout &lt;&lt; "isPrime(600851475143): " &lt;&lt; (isPrime(600851475143.0) ? "true" : "false") &lt;&lt; endl; // This one takes very long to complete cout &lt;&lt; "-----------------------------------------------------------"; } </code></pre> <p>Like this, it outputs:</p> <pre><code>[Session started at 2013-01-19 13:50:12 +0100.] ----------------------------------------------------------- isPrime(3): false isPrime(10): false </code></pre> <p>and then stops (for a few minutes). (<code>isPrime()</code> is broken, I know!) If I comment the line with <code>isPrime(600851475143)</code> out, it outpus everything except the output of the commented line of course in less than a second. </p> <p>How is it possible that a very heavy method call blocks output that should already have been written to <code>cout</code>?</p>
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    1. COThere may be some problem in your function `isPrime`. e.g it could be stuck in a loop.
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    2. CONope, the number is just very big (and it's logic is broken, so it runs extra long). I waited a few times for it to complete. @sgar91
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    3. CO@RaymondChen How should I have found that?
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