Fibonacci numbers in Nimrod

Example for versions Nimrod 0.8.8

This example uses Binet’s formula to calculate the numbers. Addition of epsilon value before rounding is necessary to get exact integer values. 

from math import sqrt, pow, round

proc fibonacci(n: int): int =
  var phi: float64 = (1.0 + sqrt(5.0)) / 2.0
  return round((pow(phi, float64(n)) - pow(-phi, -float64(n))) / sqrt(5.0) + 0.0001)

var res = ""
for i in 1..16:
  res = res & $fibonacci(i) & ", "
echo res & "..."