#**********************************************************************
# Counter Loops - February 15, 2019
#**********************************************************************

#----------------------------------------------------------------------
# A task to do many times
#----------------------------------------------------------------------

def Thing(N):
    print ("Hello",N)
    return

#----------------------------------------------------------------------
# Version #0 - The hard way to do the task 10 times.  Does not scale
# well to 20 or 1000 times.
#----------------------------------------------------------------------

print ("Version 0")
Thing(1)
Thing(2)
Thing(3)
Thing(4)
Thing(5)
Thing(6)
Thing(7)
Thing(8)
Thing(9)
Thing(10)

#----------------------------------------------------------------------
# Version #1 - Counter Loop, Counter goes from 1 through 10
#----------------------------------------------------------------------

print ("Version 1")
Counter = 1
while (Counter <= 10):
    Thing(Counter)
    Counter = Counter + 1
print ("The final value of Counter = ",Counter)

#----------------------------------------------------------------------
# Version #2 - Counter Loop, Counter goes from 0 through 9
# This version tends to be more commonly used in Python because
# of how it relates to lists and strings.
#----------------------------------------------------------------------

print ("Version 2")
Counter = 0
while (Counter < 10):
    Thing(Counter)
    Counter = Counter + 1
print ("The final value of Counter = ",Counter)

#----------------------------------------------------------------------
# Version 3 - Counter Loop, Counter goes 2, 5, 8, 11, 14, 17
# Changing the start value, the stop-test value, and the change value
# controls how many times the loop runs and for what values.
#----------------------------------------------------------------------

print ("Version 3")
Counter = 2
while (Counter < 20):
    Thing(Counter)
    Counter = Counter + 3
print ("The final value of Counter = ",Counter)

#----------------------------------------------------------------------
# Version 4 - Using a counter loop to step through a list.  Notice that
# the stop-test value is the length of the list, so the list can
# contain any number of items and the counter loop will always run
# the correct number of times.
#----------------------------------------------------------------------

print ("Version 4")
L = [4, 5, 6, 1, 9, 5, 3, 8]
Counter = 0
while (Counter < len(L)):
    print (L[Counter])
    Counter = Counter + 1
print ("The final value of Counter = ",Counter)