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sub perl_mod { 
...
                       perl_mod => sub { perl_mod($num) }, 
                       perl_and => sub { perl_and($num) }, 
                      });

nicholas(/5)@neko [106 /<1>nicholas/tmp] > ./time
Benchmark: timing 10000 iterations of perl_and, perl_mod...
  perl_and: 210 wallclock secs (209.32 usr +  0.79 sys = 210.11 CPU)
  perl_mod: 260 wallclock secs (258.62 usr +  0.93 sys = 259.55 CPU)
nicholas(/5)@neko [107 /<1>nicholas/tmp] >

#include <stdio.h>

...
  //}
  exit(0);
}

For c_and:
29.800u 0.040s 0:29.84 100.0%   0+0k 0+0io 69pf+0w

for c_mod:
29.540u 0.390s 0:29.99 99.7%    0+0k 0+0io 69pf+0w