Track 4 · Lesson 11 of 11

Mini project: a sales tally

Build a till-side sales tally step by step — totals, skipped entries, the largest sale, a bar chart and a multi-day report — while tracing loop state to find bugs.

You will be able to

• Plan a loop program by deciding its input, its accumulators and its output
• Grow a program in small milestones, testing each before moving on
• Trace loop state with a table or debug prints to find a bug
• Combine sentinel loops, continue, best-so-far and nested loops in one program