N.B. For the purpose of this exercise, the first Fibonacci number is 1, and the second is 2; that is, fib(1) = 1 and fib(2) = 2 .

Make a function isfib(x) so that:

  • if the value of the input x is not a Fibonacci number, the function returns a zero.
  • if the value of the input x is a Fibonacci number, the function returns its index in the Fibonacci sequence. That is, isfib(fib(n)) should return the value of n .
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Chris Cleveland David Hill Minh Lai Shun Nickson

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