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Selection and while-loop checkpoint

This checkpoint assesses only 1CP2-CT-2. Each section gives a concise method reminder, then uses new contexts and values. It does not assess principles-strand number representation.

1. Strings

Remember: indexes begin at zero; a slice includes its start and excludes its stop; methods return changed copies. Save a returned value when it will be used later.

Fill in the blanks3 marks

For topic = "Algorithm", len(topic) is gap 1, topic[0] is gap 2, and topic[1:4] is gap 3.

Written answer2 marks

Explain why clean = raw.strip(" ").lower() does not alter the value stored in raw.

Refer to the result returned by string methods.

Students type their answer here.

2. Selection and conditions

Translate boundary words carefully: at least means >=; at most means <=. In an if–elif–else chain, place broader overlapping thresholds after stricter ones because the first true branch wins.

Multiple choice1 mark

Which condition accepts a number outside the inclusive range 5 to 12?

Anumber < 5 or number > 12
Bnumber <= 5 and number >= 12
Cnumber >= 5 or number <= 12
Dnot number == 5

Written answer2 marks

A chain tests score >= 40 before score >= 70. Explain the resulting logic error and give the corrected order.

Use the first-true-branch rule.

Students type their answer here.

3. While loops

A terminating loop needs an initial value, a continuation condition and an update. Trace the current value through the body, apply the update, then test again. Include a starting value that makes the condition false when checking zero-pass behaviour.

Fill in the blanks2 marks

count = 2
while count gap 1 8:
    print(count)
    count = count gap 2 2

Written answer3 marks

For the completed loop, state every output and the final value of count.

Trace a pass for each true condition, then include the value that makes it false.

Students type their answer here.

4. Integrated programming task

Input a text command. While its cleaned lowercase form is not stop, output the cleaned command in uppercase and request another command. The sentinel must not be output.

It will be tested with go, WAIT, stop, and with STOP immediately. This task integrates string methods, comparison and condition-controlled repetition.

Coding task4 marks

# Construct the command loop.

5. Review the solution

Evidence of a strong solution includes correct behaviour across contrasting tests and code whose indentation, identifiers and structure reveal the algorithm. A program that works only for the demonstrated values is not sufficiently general.

Written answer2 marks

Give one boundary or zero-pass test for the integrated program and explain the fault it could expose.

Connect the input to an observable expected result.

Students type their answer here.

Multiple choice1 mark

Which statement best describes the series progression?

AStrings replace the need for conditions.
BConditions choose routes; a while loop re-tests a condition to control repetition.
CEvery selection must be placed inside a loop.
DLogical operators can be used only in truth tables.

Series complete

You have practised string manipulation, relational and logical operators, one-way and multi-branch selection, readability, and condition-controlled repetition. Later CT series revisit these constructs in lists, validation, searching, files and larger problems.