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Lesson 16 — Putting it together

Putting it together

Real programs combine everything: a function to organise the logic, a loop to go through numbers, and an if to pick the ones you want.

Why it matters: breaking a task into these building blocks is exactly how experienced developers solve big problems — one small piece at a time.

Tip: the % (modulo) operator gives the remainder, so i % 2 == 0 is true only for even numbers.

Want it another way?

Task

Finish sum_even so it returns the sum of even numbers from 1 to n. Print it for n=10.

Run your code — when the output matches the task, you will see a green check. Then mark the lesson complete.

Test your knowledge

A quick 3-question quiz on this lesson — instant feedback.

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