'Make rat' presentation slideshows

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Lecture 7

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Lecture #7

Lecture #7. Constructor:. Selectors:. The rational number abstraction. Wishful thinking:. ( make-rat <n> <d>) Creates a rational number <r>. ( numer <r>) Returns the numerator of <r>. ( denom <r>) Returns the denominator of <r>.

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CS61A Lecture 8 Data Abstraction

CS61A Lecture 8 Data Abstraction. Tom Magrino and Jon Kotker UC Berkeley EECS June 28, 2012. Computer Science in the News. Today. Quick orders of growth review Data Abstraction and making new Abstract Data Types Tuples. Review: Orders of Growth.

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(define (rat-add r1 r2) (let ((n1 (numer r1)) (d1 (denom r1)) (n2 (numer r2))

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