xlang/test/fib.x

main() {
  // print 5th fibonacci number
  print fib(5);
  return 0;
}

fib(n) {
  x0 = 1;
  x1 = 1;
  i = 0;
  while i < n {
    t = x0 + x1;
    x0 = x1;
    x1 = t;
    i = i + 1;
  }
  return x0;
}