π Day puzzle for 3/14
C + x86 assembly
Not satisfied with a constant defined in the software of your language?  Why not use a language that can access a constant value of PI right from your FPU hardware:
#include &lt;stdio.h&gt;

int main (int argc, char **argv) {
    double pi;
    __asm__(&quot;fldpi&quot; : &quot;=t&quot; (pi));
    printf(&quot;%g\n&quot;, 3 * 3 * pi);
    return (0);
}