Predict 1: Count-controlled FOR loop
Code Editor (read only)
Console
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Y11 GCSE Computer Science
PRIMM Activities: OCR Iteration
Focus topic: FOR loops (count-controlled iteration) using OCR pseudocode.
Activity 1: Predict & Run
Read each OCR pseudocode snippet, predict what happens, then run it to check.
Predict 2: FOR loop with STEP 2
Code Editor (read only)
Console
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Predict 3: Countdown FOR loop
Code Editor (read only)
Console
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Predict 4: FOR loop with multiplication output
Code Editor (read only)
Console
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Predict 5: Reverse FOR loop with STEP -2
Code Editor (read only)
Console
Press "Run this code" to see output.
Activity 2: Investigate (Parsons Problem)
- Drag and reorder the blocks to build a correct OCR FOR loop.
- The final output must be the even numbers from 2 to 10 inclusive.
- Use the OCR structure:
for ... to ... step ...andnext ....
Code Bank
Your Program
Activity 3: Modify
- The starter uses a FOR loop. Modify it to count from
10down to0. - Use
step -1correctly. - Then add a second loop that prints only odd numbers from
1to9.
Code Editor
Console
Run your code to check it.
Activity 4: Make
- Use the full OCR Reference Language IDE to create your own FOR-loop challenge.
- Include at least two different FOR loops (for example, one count up and one count down).
- Use
stepin at least one loop. - Produce clear output messages that show each iteration.