A worked example: the Fraction class
22-minute lesson · module-classes-deeper-01
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A worked example: the Fraction class
22-minute lesson · module-classes-deeper-01
- Build a Fraction class with a numerator and denominator.
- Compute the greatest common divisor with Euclid's algorithm.
- Reduce a fraction to lowest terms inside the constructor.
- Define `__str__` to print a fraction as "n/d".
Source attribution
Status: adapted
How to Think Like a Computer Scientist: Interactive Edition — source · Classes and Objects - Digging a Little Deeper / Fractions
Adaptation notes. Reading rewritten in our voice. The Fraction class is built step by step with a hand-written gcd (Euclid's algorithm) so students see the reduction logic rather than importing it. Hidden tests check reduction to lowest terms and the string form.
License notes. Original chapter is GNU FDL 1.3 (Brad Miller and David Ranum). No verbatim text from the original is reproduced here.