"""
CSCI 145 Day 6 - iteration

Part 1: Predict what each loop prints. Then uncomment the code
one section at a time and run the file to check your answers.
(If a loop never stops, click Thonny's Stop button.)

Part 2: Fill in the functions below using while and for loops.
Test them with the calls at the bottom once you're done.
"""


# ---------- Part 1: predict, then check ----------

# --- snippet A ---
# x = 10
# while x > 0:
#     print(x)
#     x = x - 3

# --- snippet B ---
# for i in range(4):
#     print(i * 10)

# --- snippet C ---
# for i in range(2, 11, 4):
#     print(i)

# --- snippet D ---
# n = 5
# while n < 5:
#     print("inside the loop")
#     n = n + 1
# print("done")


# ---------- Part 2: write the code ----------

def countdown(n):
    """
    Use a while loop to print the numbers from n down to 1, one per
    line, and then print "Liftoff!".

    If n is 0 or negative, nothing is counted down: only "Liftoff!"
    is printed. Otherwise, n, n - 1, ..., 1 are printed first, and
    then "Liftoff!".

    Params: n (int) -- the number to count down from
    Returns: None
    """
    # your code here


def print_multiples(k, limit):
    """
    Use a for loop and range to print the multiples of k, one per line,
    starting at k and going up to limit.

    If limit is itself a multiple of k, limit is printed as the last
    number. Otherwise, the last number printed is the largest multiple
    of k that is less than limit.

    Params:
        k (int) -- the number to print multiples of (k >= 1)
        limit (int) -- the largest number that may be printed
    Returns: None
    """
    # your code here


def print_powers_of_two(limit):
    """
    Bonus: print the powers of two (1, 2, 4, 8, 16, ...), one per line,
    as long as they are less than or equal to limit.

    If limit is less than 1, nothing is printed. Otherwise, the last
    number printed is the largest power of two that is <= limit.

    Params: limit (int) -- the largest number that may be printed
    Returns: None

    Think first: do you know in advance how many numbers you'll print?
    Which kind of loop fits best?
    """
    # your code here


print("countdown(3):")
countdown(3)          # 3, 2, 1, Liftoff!
print("countdown(0):")
countdown(0)          # Liftoff!

print("print_multiples(5, 20):")
print_multiples(5, 20)    # 5, 10, 15, 20
print("print_multiples(3, 10):")
print_multiples(3, 10)    # 3, 6, 9

print("print_powers_of_two(20):")
print_powers_of_two(20)   # 1, 2, 4, 8, 16