Which loop is commonly used in banking menu programs?

Question

BlackTom AI · Accepted Answer

Banking menu programs commonly use a while loop because they must repeatedly present options until the user explicitly chooses to exit.

1. Relevant knowledge points and concepts
- Menu-driven program: repeatedly displays options and processes user choices until a termination condition (e.g., "exit") is met.
- Loop types:
  - while loop: checks condition before each iteration; runs zero or more times.
  - for loop: best for a known, fixed number of iterations.
  - do loop (do...while): executes body once then checks condition (runs at least once).
  - repeat loop (repeat...until): language-specific variant similar to do...while.
- Typical requirement: indefinite repetition (unknown number of iterations) driven by user input/sentinel value.

2. Step-by-step reasoning process
- Initialization: set a control variable, e.g., choice = "" or choice = null.
- Condition: while choice != "exit" (or while not exitSelected).
- Loop body: display menu, read user input, perform action based on input.
- Update: if user selects exit, change control variable so condition becomes false and loop terminates.
- This pattern naturally maps to a while loop because the program must keep looping until a condition becomes true, and the number of iterations is not predetermined.

3. Intermediate steps / pseudocode
- choice = ""
- while choice != "exit":
    - display menu
    - choice = getUserInput()
    - if choice == "withdraw": process withdrawal
    - elif choice == "deposit": process deposit
    - elif choice == "exit": break
- end while

4. Why the correct answer is correct
- The while loop directly expresses “repeat while not exited,” handling an unknown number of iterations controlled by user input. It provides a clear precondition check so the menu continues only while needed.

5. Why other options are incorrect
- A. for loop: intended for a fixed or countable set of iterations; not suitable when repetition depends on user actions.
- C. do loop: could be used, but it guarantees at least one run; while is more commonly used for clarity and explicit top-condition checks in banking menus.
- D. repeat loop: language-specific and functionally similar to do loop; less common as the general answer than while.

6. Conclusion
The correct answer is B. while loop, which matches the provided authoritative answer.

Which loop is commonly used in banking menu programs?未知题型

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