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Grade 6 · unit review

Review: Combine Loops and Function Inputs

Trace loop scope, nested repetitions, two accumulators and independent function calls.

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Unit review questions
1. Set total = 4; repeat twice: add 3; show total. What is shown?
2. Initialize total = 0 outside the loops. Repeat twice outside and four times inside, adding 1 per inner visit. What is total?
3. Select positive items in [−3, 6, 2, 0]. What are (count, sum)?
4. Under the bump function, what does bump(3, 4, 2) return?

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Write a function positive_stats(values) returning the count and sum of positive integers. Trace it for [1, −2, 4, 0]. Then repeat that fresh function call twice and add its returned sum to a separate grand_total initialized once at 0. Predict zero outer repeats as a test.

Work on paper or in your own document. Explain the choices you made.

  • Give local count and total an initial 0 for each function call.
  • Trace positive_stats to (2, 5).
  • Initialize grand_total outside the outer repeat and trace 0 → 5 → 10.
  • Explain that zero outer repeats leaves grand_total = 0.
Compare with a model response

positive_stats: count = 0; total = 0; for each x, if x > 0: count += 1; total += x; return (count, total). For [1, −2, 4, 0], states are (1,1), (1,1), (2,5), (2,5); return (2,5). Set grand_total = 0; repeat twice: call positive_stats afresh and add its returned total 5. Grand total is 10. Zero outer repeats returns 0.

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