input: Write a python function to print all even numbers from 0 to a given number (inclusive).
  assert print_even_numbers(10) == None  # should print 0, 2, 4, 6, 8, 10
  assert print_even_numbers(5) == None  # should print 0, 2, 4
  assert print_even_numbers(0) == None  # should print 0
output: def print_even_numbers(n):
      for i in range(0, n+1, 2):
          print(i)