Question 11 mark
What does this algorithm output?
count ← 0FOR i ← 3 TO 15 STEP 4count ← count + 1ENDFOROUTPUT count
AQA 3.2.2 · Programming
Count-controlled and condition-controlled loops
AQA 8525 questions. AQA · OCR · The lesson
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Question 21 mark
A program asks for a password until the user types the right one. Which kind of loop fits best?
Question 31 mark
What does this algorithm output?
n ← 10REPEATn ← n + 5UNTIL n > 8OUTPUT n
Question 41 mark
What does this algorithm output?
total ← 0x ← 12WHILE x < 10total ← total + xx ← x + 1ENDWHILEOUTPUT total
Question 51 mark
What does this algorithm output?
stars ← 0FOR row ← 1 TO 3FOR col ← 1 TO rowstars ← stars + 1ENDFORENDFOROUTPUT stars
Structured question 17 marks
Adding square numbers
The algorithm adds square numbers until the total reaches 20 or more.
total ← 0n ← 1WHILE total < 20total ← total + n * nn ← n + 1ENDWHILEOUTPUT n
(a) Complete4 marks
the trace table. Write a value only when it changes; the first row is done for you.
| total | n | Output |
|---|---|---|
| 0 | 1 | |
(b) State1 mark
how many times the loop body runs.
(c) Explain2 marks
why a condition-controlled loop is used here rather than a count-controlled loop.
0 words
Structured question 25 marks
Adding positive numbers
A program must ask the user for ten whole numbers, one at a time, and output the total of the numbers that are greater than 0.
(a) Write5 marks
the program. You may use pseudo-code or a high-level language such as Python.