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Undefined subroutine &Book::Factorial::factorial_iterative_c called at
+ fact.pl line 3.

factorial.h============================
double factorial_recursive_c(int x); double factorial_iterative_c(int 
+x);
...
$make
$make test
$make install

    23: 00000af0    45 FUNC    GLOBAL DEFAULT   12 factorial_iterative
+_c
    26: 00000aa0    76 FUNC    GLOBAL DEFAULT   12 factorial_recursive
+_c
...
use Book::Factorial;
my $result = Book::Factorial::factorial_iterative_c(5);
print $result;