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CS1 Python Subgoals

Section 6.3 For Loop Range

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 6.3.1

Problem: Given the following code, what is the output?
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total = 0
for x in range(5, 50):
    if x % 5 == 0:
        total += x
print(total)
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Subsection 6.3.2 Determine loop components

Starting values: The initial value in x will be 5.
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total = 0
Iteration Variable: The iteration variable x will be increased by 5 every iteration.
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Termination condition: When x is 50
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Body that is repeated based on indentation:
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if x % 5 == 0:
    total += x
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Subsection 6.3.3 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 (x is 0 to 10)
x increments by 1 But only when the x is evenly divisible by 5 is the value added to total.
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Trace of the loop (x is 10 to 35, skipping 5)
Trace of the loop (x is 35 to 45 skipping 5, then 45 to 50)
Answer.
Output is 225
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