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CS1 Python Subgoals

Section 5.5 Complex Conditional

Subgoals for Evaluating a Loop.

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

Subsection 5.5.1

Problem: Given the following code, what is the output if the user enters 50, 70, 80, 65, 90, 100, 0, 5, 102?
print("Enter a value. An invalid value will end input.")
passing = 0
failing = 0
value = int(input("Score: "))
while value >= 0 and value <= 100:
    if value >= 70:
        passing+= 1
    else:
        failing+= 1
    value = int(input("Score: "))
print("Total number of scores:", passing+failing)
print("Passing:", passing, "   Failing:", failing)

Subsection 5.5.2 Determine loop components

Starting values:
passing = 0
failing = 0
# value will be the 50 since that is the first value entered by the user
Termination condition: When value is between 0 and 100 (inclusive)
Body that is repeated based on indentation:
if value >= 70:
    passing+= 1
else:
    failing+= 1
value = int(input("Score: "))

Subsection 5.5.3 Trace the loop, writing updated values for every iteration or until you identify the pattern

For every iteration of loop, write down values.
Answer.
Total number of scores: 8
Passing: 4   Failing: 4
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