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CS1 Python Subgoals

Section 7.3 Assessment: Writing Loops

Subgoals for Writing a Loop.

  1. Determine purpose of loop
    1. Pick a loop structure (while, for, do_while)
  2. Define and initialize variables
  3. Determine termination condition
    1. Invert termination condition to continuation condition
  4. Write the loop body
    1. Update Loop Control Variable to reach termination
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Exercises Exercises

    1.

      Q1: Given the following code segment:
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      x = 1
while ___:
    if x % 2 == 0:
        print(x)
    x = x + 2
      Consider the following conditions to replace ___ in the code segment:
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      1. x < 0
      2. x <= 1
      3. x < 10
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      For which of the conditions will nothing be printed?
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    • I only
    • II only
    • I and II only
    • I and III only
    • I, II and III
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    2.

      Q2: Given the following code segment which is intended to print the number of integers that evenly divide the integer input_val. (You may assume that input_val > 0.)
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      count = 0
input_val = int(input())
for k in range(1, input_val):
    if ___:
        count += 1;
print(count)
      Which of the following can be used to replace ___ so that the code will work as intended?
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    • input_val % k == 0
    • k % input_val == 0
    • input_val % k != 0
    • input_val / k == 0
    • k / input_val > 0
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    3.

      Q3: Which of the following code segments will produce the output:
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      1 4 7 10 13 16 19
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      k = 1
while k < 20:
    if k % 3 == 1:
        print(k, end=" ")
    k = k + 3

      for k in range(1, 19):
    if k % 3 == 1:
        print(k, end=" ")

      k = 1
while k < 20:
    print(k, end=" ")
    k = k + 3
    • I only
    • II only
    • I and II only
    • I and III only
    • I, II and III
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    4.

      Q4: What is the maximum number of times “Hello” can be printed?
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      k = # a random number such that 1 <= k <= n 
for p in range(2, k):
    for r in range(1, k - 1):
        print("Hello")
    • 2
    • n - 1
    • n - 2
    • (n - 2) * (n - 2)
    • n * n
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    5.

    Q5: Fill in the blanks in the following code to create a program that will print the prime numbers between 1 and 100 (inclusive). 
    for i in range(__A__, __B__):
    is_prime = False
    for j in range(__C__, __D__):
        if i % j == __E__:
            is_prime = True
    if is_prime:
        print(i, end=" ")
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    Blank A:
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    Blank B:
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    Blank C:
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    Blank D:
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    Blank E:
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