Must-do problems: Loops

150 min · Beginner

These are the loop problems every Java beginner should be able to solve, from a simple countdown to prime factors and Pascal's triangle. Trace each one on paper with a small input first, then check your program against every test.

What you will learn

Choose between for, while and do-while for a task
Work with digits using % 10 and / 10
Stop or skip rounds with break and continue
Build star, number and alphabet patterns with nested loops

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