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PODifference in integer size for 64-bit system(confuse with my old 32-bit pc system)
 

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    <p>Few months ago i get myself a laptop with cpu intel i7-2630qm with a 64-bit windows. While practising my programming skils under this system , I encountered some difference in terms of integer size which makes me think that it's probably due to my new 64-bit system.</p> <p>Let's take a look at a code.</p> <p><b>The C Code :</b></p> <pre><code>#include &lt;stdio.h&gt; int main(void) { int num = 20; printf("%d %lld\n" , num , num); return 0; } </code></pre> <p><b>The Question :</b></p> <p>1.) I remember before getting this new laptop , which mean that time i'm still using my old 32-bit system , when i run this code , the program will print the integer <code>20</code> while some random number next to it due to the <code>%lld</code> specifier.</p> <p>2.)But this phenomena no longer happen when i'm using my new laptop , it will instead print both integer correctly , even if i change the variable <code>num</code> to type <code>short</code>.</p> <p>3.)Is it on a 64-bit system , there's new integer promotion which will promote <code>int</code> to long long when it's use as an argument??Or is it <code>short</code> integer can be promoted to <code>long long</code> which is 64-bit too when pass as an argument??</p> <p>4.)Besides that I'm quite confuse with one thing , on 16-bit system , <code>int</code> would be 16-bit and it would be 32-bit when it's on a 32-bit system.But why isn't it become 64-bit when it's on a 64-bit??</p> <p>================================================================================== <b>Addon :</b></p> <p>1.)I choose "console program(64-bit)" as my project on the IDE while using my new laptop but "console program" on my 32-bit old PC system.</p> <p>2.)I've check the size of <code>int</code> under "console program(64-bit)" project using <code>sizeof</code> operator and it returns 32-bit while <code>short</code> still remain 16-bit.The only change is <code>long</code> type , it's 64-bit and <code>long long</code> still remain its usual 64-bit size.</p>
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    1. COYou are simply observing undefined behavior(using %lld as the printf specifier, but giving it an int or short instead of a long long), not some well defined integer promotion rules.
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