Trace tables

What this lesson covers

• Complete a trace table to dry-run an algorithm
• Identify errors in algorithms and suggest corrections

Key vocabulary

Trace table

A table recording the values of variables and outputs at each step of a dry run.

Dry run

Working through an algorithm by hand, step by step, with test data.

Rogue value

A special value that stops an input loop, such as −1 or 999.

Check your learning

• Quick check: 4 questions
• Key vocabulary test: 3 terms
• Activity 1: Which values? · 5 questions
• Activity 2: Trace tables quiz · 6 questions
• Activity 3: Doing a dry run · drag and drop