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$ cat a.c
#include <stdio.h>
...

$ gcc -o a a.c && a
Stop blaming Perl for your own mistakes!

$ perl -e'printf "%.20e\n", $_ for @ARGV' 0.45 0.92 0.37
4.50000000000000011102e-01
9.20000000000000039968e-01
3.69999999999999995559e-01

$ perl -le 'print abs(5056.45 + 10112.92 - 15169.37) < 0.0001 ? "as ex
+pected" : "perl math sucks!"'
as expected

$ perl -le 'print sprintf("%.4f", 5056.45 + 10112.92) eq sprintf("%.4f
+", 15169.37) ? "as expected" : "perl math sucks!"'
as expected