OCR H446 · Component 02

2.2.1 Programming techniques

Trace program constructs, parameters, recursion and object-oriented behaviour; use debugging tools deliberately.

Topic overview

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x = 7. Procedure change(p) performs p = p + 4, then p = p * 2. State x after change(x) under scalar pass-by-value and under pass-by-reference.Trace
total = 0; read n; WHILE n != -1: total = total + n; read n. Inputs are 6,0,5,-1. State total and explain why -1 is not added.Trace
Sketch a Counter class with private value, a constructor taking start, and an increment method. State the value after constructing with 4 and calling increment twice.Write
What are sequence, selection and iteration?Constructs
How do a pre-condition WHILE loop and a post-condition loop differ?Compare
total = 0; for i = 1 to 3 inclusive: total = total + 2*i. What is total afterwards?Trace

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