# write loop, using
#   while
#   for in collection
#   for in range
# compare the differences




# example: write a program, using a for loop,
# that prints the numbers 0, 2, 3, ..., 9
for num in range(10):
    print(num)


# example: write a program, using a for loop,
# that prints the numbers 1, 2, 3, ..., 10
for num in range(1, 11, 1):
    print(num)

# another solution, omitting step (since default step is 1)
for num in range(1, 11):
    print(num)


# write a program, using a for loop,
# that prints the numbers 2, 4, 6, ..., 20
for num in range(2, 21, 2):
    print(num)


# write a program, using a for loop,
# that prints the numbers 20, 18, 16, ..., 2
for num in range(20, 1, -2):
    print(num)