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POMSVC++ handling unsigned long long int
 

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    <p>I'm having an issue with the way MSVC handles unsigned long long integers. Here's code to reproduce:</p> <pre><code>// test.cpp (note extension) #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; int main(int argc, char **argv) { unsigned long long int address = 0x0A0B0C0D0E0F; printf("Address=%llu\n", address); printf("%02X:%02X:%02X:%02X:%02X:%02X\n", ((address &gt;&gt; (5 * 8)) &amp; 0xff), ((address &gt;&gt; (4 * 8)) &amp; 0xff), ((address &gt;&gt; (3 * 8)) &amp; 0xff), ((address &gt;&gt; (2 * 8)) &amp; 0xff), ((address &gt;&gt; (1 * 8)) &amp; 0xff), (address &amp; 0xff)); printf("%02X:", ((address &gt;&gt; (5 * 8)) &amp; 0xff)); printf("%02X:", ((address &gt;&gt; (4 * 8)) &amp; 0xff)); printf("%02X:", ((address &gt;&gt; (3 * 8)) &amp; 0xff)); printf("%02X:", ((address &gt;&gt; (2 * 8)) &amp; 0xff)); printf("%02X:", ((address &gt;&gt; (1 * 8)) &amp; 0xff)); printf("%02X\n", (address &amp; 0xff)); exit(0); } </code></pre> <p>When I compile this on linux, I get (as expected):</p> <pre><code>Address=11042563100175 0A:0B:0C:0D:0E:0F 0A:0B:0C:0D:0E:0F </code></pre> <p>However, when I compile this on MSVC++ 2008 Express I get:</p> <pre><code>Address=11042563100175 0A:00:0B:00:0C:00 0A:0B:0C:0D:0E:0F </code></pre> <p>Have I formatted my printf statement incorrectly? Or does MSVC leave an extra byte on the stack after the shift/and operations? Or is the issue with something else?</p> <p>Note: when compiling with MSVC you need to use the '.cpp' file extension to force C++ mode. I believe this is because MSVC in straight C mode does not include (all of) C99 which includes the '%llu' flag for printf.</p> <p>Simon.</p>
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    1. COHmm. It seems that MSVC's stack handling in printf is indeed the issue. In this case, it only pops a single long from the stack, leaving the other half of the long remaining. Casting to int seems to resolve the issue.
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    2. COIt's not an issue, it's correct behavior. `printf` is a varargs function, you as the programmer are responsible for type safety. The `%X` format specifier promises an `int`, by passing a `unsigned long long` instead, all bets are off.
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