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Grade 7 · unit review

Review: Organize Programs into Clear Responsibilities

Design a paper helper for doubling a nonnegative integer count. State its contract, distinguish return from printing and give a valid example without modifying shared state.

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Unit review questions
1. Function prints a label and reaches its end. Classify the stated function behavior.
Need a hint?
  • Track the caller’s returned value separately from visible output.
  • Do not substitute printed text for the return value.
2. Function updates a global record. Which role is described?
Need a hint?
  • Distinguish a local temporary, returned result and stated external side effect.
  • Two functions using the same local name do not automatically share one variable.
3. Build the reader-facing result sentence. Which helper fits the stated job?
Need a hint?
  • Assign each helper a coherent responsibility with a stated input and result.
  • A helper name does not prove the helper actually has one responsibility.
4. Produces a numeric result. Classify this contract statement.
Need a hint?
  • Match the requested documentation element to its role in the contract.
  • An example is useful but does not replace an input rule.

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

Design a paper helper for doubling a nonnegative integer count. State its contract, distinguish return from printing and give a valid example without modifying shared state.

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

  • Use only supplied fictional inputs and state the relevant rule.
  • Include labeled steps or evidence for each decision.
  • Name one limitation or tempting mistake.
  • Check that the result meets the task and revise a justified error.
Compare with a model response

The helper accepts a nonnegative integer and returns twice that value. For input 4 it returns 8. Printing "8" alone would not provide a numeric return. Its calculation uses local work and performs no file or shared-record changes.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.