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CS1 Python Subgoals

Section 6.8 Evaluate Loops-WE4-P1

Subgoals for Evaluating a Loop.

  1. Determine Loop Components
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    1. Start condition and values
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    2. Iteration variable and/or update condition
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    3. Termination/final condition
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    4. Body that is repeated based on indentation
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  2. Trace the loop, writing updated values for every iteration or until you identify the pattern
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Subsection 6.8.1 Evaluate Loops-WE4-P1

Exercises Exercises

1.
Q16: What is the output of the following loop if the user input is: 10, 20, 30, 35, 40, -1
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print("Enter a negative score to signal the end of the input.")
total = 0
count = 0
score = int(input("Score: "))
while score >= 0:
    count += 1
    total += score
    score = int(input("Score: "))
print(total/count)
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2.
Q17: What is the output of the following loop if the user input is: 10, 20, 30, 35, 40, -1?
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print("Enter a negative score to signal the end of the input.")
total = 0
count = 0
score = int(input("Score: "))
while score >= 0:
    score = int(input("Score: "))
    count += 1
    total += score
print(total/count)
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3.
Q18: What is the output of the following loop if the user input is: 10, 20, 30, 35, 40, -1
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print("Enter a negative score to signal the end of the input.")
total = 0
count = 0
score = int(input("Score: "))
while score >= 0:
    total += score
    score = int(input("Score: "))
    count += 1
print(total/count)
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4.
Q19: What is the output of the following loop if the user input is: 20, 60, 75, 35, 95, -1
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print("Enter a negative score to signal the end of the input.")
passing = 0
failing = 0
score = int(input(“Score: “))
while score >= 0:
    if score >= 60:
        passing += 1
    else:
        failing += 1
    score = int(input(“Score: ”))
print("Percent passing: " + (passing / (passing + failing) * 100))
  • Percent passing: 60
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  • Percent passing: 75
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  • Percent passing: 80
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  • Percent passing: 85
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  • Percent passing: 90
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5.
Q20: What is the output of the following loop if the user input is: 1, 3, 9, 6, 9, 2, -1
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print(“Enter a negative value to signal the end of the input.”)
val = int(input(“Value: “))
max = value
min = value
val = int(input(“Value: “))
while val >= 0:
    if val > max:
        max = val
    if val < min:
        min = val
    val = int(input(“Value: “))
print(“Maximum value was “ + max + “ and minimum value was “ + min)
  • Maximum value was 9 and minimum value was 1
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  • Maximum value was 6 and minimum value was 1
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  • Maximum value was 9 and minimum value was -1
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  • Maximum value was 3 and minimum value was 1
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  • Maximum value was 9 and minimum value was 2
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