// Calculate the $n'th Fibonacci number

// Set this to how many in the sequence to generate
$n = 10;

// These are what hold the current calculation
$a = 0;
$b = 1;

// This holds the complete sequence that is generated
$sequence = "";

// Prepare a loop
$i = 0;
:calcnextnumber;
   $i = $i++;

   // Do the calculation for this loop iteration
   $b = $a + $b;
   $a = $b - $a;

   // Add the result to the sequence
   $sequence = $sequence << $a;

   // Make the loop run a fixed number of times
   if $i < $n; {
      $sequence = $sequence << ", ";
      goto calcnextnumber;
   }

// Use the loop counter as the placeholder
$i--;

// Return the sequence
return = "Fibonacci number " << $i << " is " << $a << " (" << $sequence << ")";