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#include <stdio.h>

#define $arg function_argument
#define my int
#define sub int
#define BEGIN int main(void)

my $arg;

sub hello() {
	printf("Hello, welcome to Perl-C!\n");
	printf("This program is both, valid C and Perl code!\n");
	printf("It calculates all fibonacci numbers from 0 to 9!\n\n");
	return 0;
}

sub fibonacci() {
	my $n = $arg;

	if ($n < 2) {
		return $n;
	}

	$arg = $n - 1;
	my $fib1 = fibonacci();
	$arg = $n - 2;
	my $fib2 = fibonacci();

	return $fib1 + $fib2;
}

BEGIN {
	hello();
	my $i = 0;

	for ($i = 0; $i <= 10; ++$i) {
		$arg = $i;
		printf("fib(%d) = %d\n", $i, fibonacci());
	}

	return 0;
}