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CS1 Python Subgoals

Section 6.1 While Counter

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 6.1.1

Problem: Given the following code, what is the output?
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counter = 0
total = 0
while counter < 50:
    if counter % 5 == 0:
        total += counter
    counter += 1
print(total)
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Subsection 6.1.2 Determine loop components

Starting values:
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counter = 0
total = 0
Termination condition:
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while counter < 50:
Body that is repeated based on indentation:
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if counter % 5 == 0:
    total += counter
counter += 1
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Subsection 6.1.3 Trace the loop, writing updated values for every iteration or until you identify the pattern

For every iteration of loop, write down values.
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Trace of the loop (counter is 0 to 10)
counter increments by 1 But only when the counter is evenly divisible by 5 is the value added to total.
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Trace of the loop (counter is 10 to 35)
Trace of the loop (counter is 35 to 50)
Answer.
Output is 225
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