2.9 Design Considerations and Programming Practices

Actions should be ordered logically so data is available when needed.

Purpose: To ensure programs run correctly and avoid errors.

Python example:

price = 10
quantity = 3
total = price * quantity
print(total)
        

The calculation happens only after values are assigned.

Operations must follow the correct order (BIDMAS) to ensure accuracy.

Python example:

result = 10 + 2 * 5
print(result)

correct_result = (10 + 2) * 5
print(correct_result)
        

Brackets are used to control execution order and avoid errors.

Data structures should be chosen based on efficiency and memory usage.

Example: A dictionary provides faster lookups than a list.

Python example:

scores = {"Alex": 85, "Sam": 92}

print(scores["Sam"])