Add hours on a 12-hour clock

Python Intermediate alien ages 11-13 From CS Unplugged

The problem

On a 12-hour clock, 11 o'clock plus 3 hours is 2 o'clock. Write a function add_hours_12(start, hours) that gives back the new hour, from 1 to 12.

You will practice: remainder (%), clock arithmetic, special cases

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Your code

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Test results

What your code printed

CC BY-SA 4.0

Adapted from a CS Unplugged programming challenge by the University of Canterbury Computer Science Education Research Group, licensed CC BY-SA 4.0.

Original challenge · License: CC BY-SA 4.0

Changes: Rewritten in our own words as a function with tests, hints and steps, in Python and JavaScript, by Open Cosmos. This version is also CC BY-SA 4.0.