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    <p>Use the non-standard <code>apostrophe</code> flag in the printf format string, if you have that option available and don't mind losing a little bit of portability.</p> <p>According to my documentation, the <code>'</code> flag is available for <a href="http://en.wikipedia.org/wiki/Posix" rel="noreferrer" title="Portable Operating System Interface [for Unix]">POSIX</a> systems since 1997.</p> <p>If you are on Unix, Linux, Mac, ... you should have no problem<br> If you are on Windows, DOS, iSeries, Android, ... all bets are off (but maybe you can install a POSIX layer to your system).</p> <pre><code>#include &lt;locale.h&gt; #include &lt;stdio.h&gt; int main(void) { long int x = 130006714000000; setlocale(LC_NUMERIC, "en_US.utf-8"); /* important */ while (x &gt; 0) { printf("# %%'22ld: %'22ld\n", x); /* apostrophe flag */ x *= 2; /* on my machine, the Undefined Behaviour for overflow // makes the number become negative with no ill effects */ } return 0; } </code></pre> <p>On my system this program produces:</p> <pre><code># %'22ld: 130,006,714,000,000 # %'22ld: 260,013,428,000,000 # %'22ld: 520,026,856,000,000 # %'22ld: 1,040,053,712,000,000 # %'22ld: 2,080,107,424,000,000 # %'22ld: 4,160,214,848,000,000 # %'22ld: 8,320,429,696,000,000 # %'22ld: 16,640,859,392,000,000 # %'22ld: 33,281,718,784,000,000 # %'22ld: 66,563,437,568,000,000 # %'22ld: 133,126,875,136,000,000 # %'22ld: 266,253,750,272,000,000 # %'22ld: 532,507,500,544,000,000 # %'22ld: 1,065,015,001,088,000,000 # %'22ld: 2,130,030,002,176,000,000 # %'22ld: 4,260,060,004,352,000,000 # %'22ld: 8,520,120,008,704,000,000 </code></pre>
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    1. POconvert astronomically large numbers into human readable form in C/C++
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    1. COThis is the only answer that does exactly what Andrei wants, using exactly the tools he wants to use.
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    2. COI wish this were standard.
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    3. COexactly what I wanted. I hope my profile nor name scares anyone...
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