GCSE (9-1) Computer Science
Mark Scheme
J277/02: Unit 2.2.10 Sub-programs
Question Answer Marks Guidance
1 Gap 1: function OR def (1)
Gap 2: return (1) 		2
Accept either OCR Reference Language or Python keywords.
2 Function: Returns a value (1).
Procedure: Does NOT return a value (just performs an action) (1). 		2
Must clearly distinguish based on the return value.
3 Output line 1: 50 (1)
Output line 2: 10 (1) 		2
Explanation (implied): Only the local variable changes inside the function. Global remains 10.
4a Line 02 1
4b The parameter `user_input` is overwritten by a new input inside the function (1).
This makes the passed argument useless/ignored (1). 		2
Focus on the overwriting of the parameter.
5 16 (3) 3
Working:
c = 5 + 3 = 8 (1)
Check 8 > 10 is False (1)
Return 8 * 2 = 16 (1)
6 
function get_discount(price)
  if price > 100 then
    price = price * 0.9
  endif
  return price
endfunction
 6
Mark Points:
- Correct function definition with parameter (1)
- Correct IF condition (> 100) (1)
- Correct calculation (* 0.9 or - 10%) (1)
- Correct return of result (1)
- Logic/Syntax correctness (2)
7a Use a Sub-program (Function/Procedure). 1
7b Any two from:
- Code Reusability (1)
- Easier Maintenance/Debugging (1)
- Decomposability (breaking down problems) (1) 		2
8 Arguments 1
Parameters are the variable names in definition; Arguments are the values passed.
OCR 2026