Lecture 5

# 9 an artificial example with rabbits rabbits never

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Unformatted text preview: ems of the “same kind.” 9 An (artificial) example with rabbits. - Rabbits never die. - Rabbits always give birth to twins, male and female. - A couple of rabbits give birth to twins at the first day of every month, starting age 3 months. - We start with ADAM rabbit and EVE Rabbit. 11 FIBONACCI SEQUENCE: A sequence of numbers is defined as follows: The first number is 1. The second number is 1. Every other number is the sum of the two numbers before it. 1 1 2 3 5 8 13 21 34 55 89 8 int fib(int n) { if (n <= 2) return 1; else return fib(n-1) + fib(n-2); } The recursive implementation is, however, TERRIBLY inefficient, and is not recommended. fib(7) will call fib(3) 5 times! What a waste! 10 Month 1: Couples: 1 Adam, Eve 2: 1 Adam, Eve 3: 2 A&E and twins 1 4: 3 A&E twins 1, twins 2 5: 5 twins 1 have twins 4 6: 8 twins 2 have twins 7 Surprise, surprise,...
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