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# The fibonacci.pl.raku.c Polyglot

In computing, a polyglot is a computer program or script written in a valid form of multiple programming languages, which performs the same operations or output independent of the programming language used to compile or interpret it.

https://en.wikipedia.org/wiki/Polyglot_(computing)

## The Fibonacci numbers

For fun, I programmed my own Polyglot, which is both valid Perl, Raku, C and C++ code (I have added C++ and Raku support in 2022). The exciting part about C and C++ is that \$ is a valid character to start variable names with:

``````#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 the Fibonacci Numbers!\n");
printf("This program is all, valid C and C++ and Perl and Raku 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;

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

You can find the full source code at GitHub:

https://codeberg.org/snonux/perl-c-fibonacci

### Let's run it with C and C++

``````% gcc fibonacci.pl.raku.c -o fibonacci
% ./fibonacci
Hello, welcome to the Fibonacci Numbers!
This program is all, valid C and C++ and Perl and Raku code!
It calculates all fibonacci numbers from 0 to 9!

fib(0) = 0
fib(1) = 1
fib(2) = 1
fib(3) = 2
fib(4) = 3
fib(5) = 5
fib(6) = 8
fib(7) = 13
fib(8) = 21
fib(9) = 34
fib(10) = 55

% g++ fibonacci.pl.raku.c -o fibonacci
% ./fibonacci
Hello, welcome to the Fibonacci Numbers!
This program is all, valid C and C++ and Perl and Raku code!
It calculates all fibonacci numbers from 0 to 9!

fib(0) = 0
fib(1) = 1
fib(2) = 1
fib(3) = 2
fib(4) = 3
fib(5) = 5
fib(6) = 8
fib(7) = 13
fib(8) = 21
fib(9) = 34
fib(10) = 55
``````

### Let's run it with Perl and Raku

``````% perl fibonacci.pl.raku.c
Hello, welcome to the Fibonacci Numbers!
This program is all, valid C and C++ and Perl and Raku code!
It calculates all fibonacci numbers from 0 to 9!

fib(0) = 0
fib(1) = 1
fib(2) = 1
fib(3) = 2
fib(4) = 3
fib(5) = 5
fib(6) = 8
fib(7) = 13
fib(8) = 21
fib(9) = 34
fib(10) = 55

% raku fibonacci.pl.raku.c
Hello, welcome to the Fibonacci Numbers!
This program is all, valid C and C++ and Perl and Raku code!
It calculates all fibonacci numbers from 0 to 9!

fib(0) = 0
fib(1) = 1
fib(2) = 1
fib(3) = 2
fib(4) = 3
fib(5) = 5
fib(6) = 8
fib(7) = 13
fib(8) = 21
fib(9) = 34
fib(10) = 55
``````

It's entertaining to play with :-).