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printf("%.16e", sqrt(2.0));

printf(MY_FORMAT, sqrt(2.0));

WRITEMAKEFILE(
  .... 
  DEFINE => '-DMY_FORMAT="%.16e"',
  ....
);

use strict;
use warnings;
...
EOC

foo();

C:\_32\C>type try.c
#include <stdio.h>
...
C:\_32\C>try
1.4142135623730951e+000
C:\_32\C>