Counter example in Python

counter.py

def a(x=[0]):
	x.append(x[-1] + 1)
	return x[-1]

print a()
print a()
print a()


def b(x=[0]):
	x[0] += 1
	return x[0]

print b()
print b()
print b()


def my_clock(x=[0]):
        x[0] = (x[0] + 1) % 24
        return x[0]

for _ in range(0,24 * 2):
        print "time: %s" % my_clock()


def ring_counter(x=[0], c=24):
        x[0] = (x[0] + 1) % c
        return x[0]

for _ in range(0, 24 * 2):
        print ring_counter(c=12)

Oh god, my eyes!

@zombiecalypse
You right the other functions are ugly. I just added this nice my_clock() function :-)

Why not

def clock1():
  i = 0
  while True:
    yield i%24

a = clock1()
print next(a)
print next(a)

Or maybe

def clock2():
  i = 0
  def tock():
    i+=1
    return I
  return tock

Of course a generator and anonymous function does the same job :-).